4.1 Therapeutic indication
For the treatment of type 2 diabetes mellitus.
4.2 Posology & method of administration
The usual recommended dose for adults is 1 tablet once daily or as directed by the Physician.
Geriatric use
In general, elderly patients often have physiological hypofunction; & therefore, Sitagliptin should be administered carefully. Start with lowest dose in elderly patients due to higher risks of lactic acidosis, poor renal & hepatic functions.
Pediatric use
Safety & effectiveness of Sitagliptin / Metformin hydrochloride tablets in paediatric patients under 18 years have not been established. Hence, Zensita MP tablet is not recommended in paediatric group. Method of administration : For oral administration only.
Zensita MP tablets must be swallowed whole & not to be chewed or crushed.
4.3 Contraindications
- Known hypersensitivity Pioglitazone, Sitagliptin & Metformin hydrochloride or to any other component of this product.
- Cardiac failure or history of cardiac failure (NYHA stages I-IV), hepatic impairment, diabetic ketoacidosis, current bladder cancer or a history of bladder cancer & un-investigated macroscopic haematuria.
- Renal impairment (e.g. serum creatinine levels ≥ 1.5 mg/dL for men, 1.4 mg/dL for women or abnormal creatinine clearance), which may also result from conditions such as cardiovascular collapse (shock), acute myocardial infarction & septicemia.
- Acute or chronic metabolic acidosis, including diabetic ketoacidosis. Diabetic ketoacidosis should be treated with insulin.
4.4 Special warnings & precautions for use
Sitagliptin
General
Sitagliptin should not be used in patients with type 1 diabetes or for the treatment of diabetic ketoacidosis.
Acute pancreatitis
Use of DPP-4 inhibitors has been associated with a risk of developing acute pancreatitis. Patients should be informed of the characteristic symptom of acute pancreatitis : persistent, severe abdominal pain. Resolution of pancreatitis has been observed after discontinuation of Sitagliptin (with or without supportive treatment), but very rare cases of necrotising or haemorrhagic pancreatitis and/or death have been reported. If pancreatitis is suspected, Sitagliptin & other potentially suspect medicinal products should be discontinued; if acute pancreatitis is confirmed, Sitagliptin should not be restarted.
Caution should be exercised in patients with a history of pancreatitis Hypoglycaemia when used in combination with other anti-hyperglycaemic medicinal products.
In clinical trials of Sitagliptin as monotherapy & as part of combination therapy with medicinal products not known to cause hypoglycaemia (i.e. Metformin hydrochloride and/or a PPAR agonist), rates of hypoglycaemia reported with Sitagliptin were similar to rates in patients taking placebo. Hypoglycaemia has been observed when Sitagliptin was used in combination with insulin or a sulphonylurea. Therefore, to reduce the risk of hypoglycaemia, a lower dose of sulphonylurea or insulin may be considered.
Renal impairment
Sitagliptin is renally excreted. To achieve plasma concentrations of Sitagliptin similar to those in patients with normal renal function, lower dosages are recommended in patients with GFR < 45 mL/min, as well as in ESRD patients requiring haemodialysis or peritoneal dialysis When considering the use of Sitagliptin in combination with another anti-diabetic medicinal product, its conditions for use in patients with renal impairment should be checked.
Hypersensitivity reactions
Post-marketing reports of serious hypersensitivity reactions in patients treated with Sitagliptin have been reported.
These reactions include anaphylaxis, angioedema & exfoliative skin conditions including Stevens-Johnson syndrome. Onset of these reactions occurred within the first 3 months after initiation of treatment, with some reports occurring after the first dose. If a hypersensitivity reaction is 5 suspected, Sitagliptin should be discontinued. Other potential causes for the event should be assessed, & alternative treatment for diabetes initiated.
Bullous pemphigoid There have been post-marketing reports of bullous pemphigoid in patients taking DPP-4 inhibitors including Sitagliptin. If bullous pemphigoid is suspected, Sitagliptin should be discontinued.
Pioglitazone
Warning
Bladder cancer with Pioglitazone advice for healthcare practitioners :
Patients with active bladder cancer or with a history of bladder cancer & those with un-investigated haematuria, should not receive Pioglitazone.
Prescribers should review the safety & efficacy of Pioglitazone in individuals after 3 - 6 months of treatment to ensure that only patients who are deriving benefit continue to be treated. Pioglitazone should be stopped in patients who do not respond adequately to treatment (e.g. reduction in glycosylated haemoglobin, HbA1c).
Before starting Pioglitazone, the following known risk factors for development of bladder cancer should be assessed in individuals : age, current or past history of smoking, exposure to some occupational or chemotherapy agents such as cyclophosphamide or previous irradiation of the pelvic region.
Use in elderly patients should be considered carefully before & during treatment because the risk of bladder cancer increases with age. Elderly patients should start on the lowest possible dose & be regularly monitored because of the risks of bladder cancer & heart failure associated with Pioglitazone.
Fluid retention & cardiac failure
Pioglitazone can cause fluid retention, which may exacerbate or precipitate heart failure. When treating patients who have at least one risk factor for development of congestive heart failure (e.g. prior myocardial infarction or symptomatic coronary artery disease or the elderly), physicians should start with the lowest available dose & increase the dose gradually. Patients should be observed for signs & symptoms of heart failure; weight gain or oedema; particularly those with reduced cardiac reserve. There have been post-marketing cases of cardiac failure reported when Pioglitazone was used in combination with insulin or in patients with a history of cardiac failure.
Patients should be observed for signs & symptoms of heart failure, weight gain & oedema when Pioglitazone is used in combination with insulin. Since Insulin & Pioglitazone are both associated with fluid retention, concomitant administration may increase the risk of oedema. Post marketing cases of peripheral oedema & cardiac failure have also been reported in patients with concomitant use of Pioglitazone & nonsteroidal anti-inflammatory drugs, including selective COX-2 inhibitors. Pioglitazone should be discontinued if any deterioration in cardiac status occurs.
A cardiovascular outcome study of Pioglitazone has been performed in patients under 75 years with type 2 diabetes mellitus & pre-existing major macrovascular disease. Pioglitazone or placebo was added to existing antidiabetic & cardiovascular therapy for up to 3.5 years. This study showed an increase in reports of heart failure; however, this did not lead to an increase in mortality in this study. Significant fluid retention leading to the development / exacerbation of congestive heart failure has been reported with Pioglitazone - avoid its use in patients in heart failure or at risk of developing heart failure.
Elderly
Combination use with insulin should be considered with caution in the elderly because of increased risk of serious heart failure. In light of age- related risks (especially bladder cancer, fractures & heart failure), the balance of benefits & risks should be considered carefully both before & during treatment in the elderly.
Bladder cancer
Cases of bladder cancer were reported more frequently in a meta-analysis of controlled clinical trials with Pioglitazone (19 cases from 12,506 patients, 0.15%) than in control groups (7 cases from 10,212 patients, 0.07%) HR = 2.64 (95% CI 1.11 - 6.31, p = 0.029). After excluding patients in whom exposure to study drug was less than one year at the time of diagnosis of bladder cancer, there were 7 cases (0.06%) on Pioglitazone & 2 cases (0.02%) in control groups. Epidemiological studies have also suggested a small increased risk of bladder cancer in diabetic patients treated with Pioglitazone, although not all studies identified a statistically significant increased risk.
Risk factors for bladder cancer should be assessed before initiating Pioglitazone treatment (risks include age, smoking history, exposure to some occupational or chemotherapy agents e.g. cyclophosphamide or prior radiation treatment in the pelvic region). Any macroscopic haematuria should be investigated before starting Pioglitazone therapy. Patients should be advised to promptly seek the attention of their physician if macroscopic haematuria or other symptoms such as dysuria or urinary urgency develop during treatment.
There is some evidence that Pioglitazone may be associated with an increased risk of developing bladder cancer. Pioglitazone should not be used in patients with active bladder cancer & should be used with caution in patients with a history of bladder cancer.
Information for patients
Patients should be informed of the potential risks & benefits of Sitagliptin / Metformin Hydrochloride tablets & of alternative modes of therapy. They should also be informed about the importance of adherence to dietary instructions, of a regular exercise program, & of regular testing of blood glucose, & glycated hemoglobin test.
During periods of stress such as fever, trauma, infection, or surgery, medication requirements may change & patients should be advised to seek medical advice promptly.
The risks of lactic acidosis, its symptoms & conditions that predispose to its development, as noted in the Metformin hydrochloride sections, should be explained to patients.
Patients should be advised to discontinue Metformin hydrochloride immediately & to promptly notify their health practitioner if unexplained hyperventilation, myalgia, malaise, unusual somnolence, or other nonspecific symptoms occur. Once a patient is stabilized on any dose level of Metformin hydrochloride, gastrointestinal symptoms, which are common during initiation of Metformin hydrochloride therapy, are unlikely to recur. Later occurrence of gastrointestinal symptoms could be due to lactic acidosis or other serious disease.
Patients should be informed about the importance of regular testing of renal function & hematological parameters when receiving treatment with Sitagliptin / Metformin hydrochloride.
Patients should be counselled against excessive alcohol intake, either acute or chronic, while receiving Sitagliptin / Metformin hydrochloride tablets.
Metformin (Metformin hydrochloride Sustained Release tablets) alone does not usually cause hypoglycemia, although it may occur when Metformin is used in conjunction with insulin secretagogues, such as sulfonylureas & insulin.
Patients should be informed that Sitagliptin / Metformin tablets must be swallowed whole & not crushed or chewed & that the inactive ingredients may occasionally be eliminated in the faeces as a soft mass that may resemble the original tablet.
Patients should be advised to notify their health practitioner immediately in case of Sitagliptin / Metformin hydrochloride overdose.
4.5 Drugs interactions
Sitagliptin
Effects of other medicinal products on Sitagliptin clinical data described below suggest that the risk for clinically meaningful interactions by co-administered medicinal products is low.
In vitro studies indicated that the primary enzyme responsible for the limited metabolism of Sitagliptin is CYP3A4, with contribution from CYP2C8. In patients with normal renal function, metabolism, including via CYP3A4, plays only a small role in the clearance of Sitagliptin. Metabolism may play a more significant role in the elimination of Sitagliptin in the setting of severe renal impairment or end-stage renal disease (ESRD). For this reason, it is possible that potent CYP3A4 inhibitors (i.e. Ketoconazole, Itraconazole, Ritonavir, Clarithromycin) could alter the pharmacokinetics of Sitagliptin in patients with severe renal impairment or ESRD. The effect of potent CYP3A4 inhibitors in the setting of renal impairment has not been assessed in a clinical study.
In vitro transport studies showed that Sitagliptin is a substrate for p-glycoprotein & organic anion transporter-3 (OAT3). OAT3 mediated transport of Sitagliptin was inhibited in vitro by probenecid, although the risk of clinically meaningful interactions is considered to be low. Concomitant administration of OAT3 inhibitors has not been evaluated in vivo.
Metformin hydrochloride
Co-administration of multiple twice-daily doses of 1,000 mg Metformin hydrochloride with 50 mg Sitagliptin did not meaningfully alter the pharmacokinetics of Sitagliptin in patients with type 2 diabetes.
Ciclosporin
A study was conducted to assess the effect of Ciclosporin, a potent inhibitor of p-glycoprotein, on the pharmacokinetics of Sitagliptin. Co-administration of a single 100 mg oral dose of Sitagliptin & a single 600 mg oral dose of Ciclosporin increased the AUC & Cmax of Sitagliptin by approximately 29% & 68%, respectively. These changes in Sitagliptin pharmacokinetics were not considered to be clinically meaningful. The renal clearance of Sitagliptin was not meaningfully altered. Therefore, meaningful interactions would not be expected with other p glycoprotein inhibitors.
Effects of Sitagliptin on other medicinal products
Digoxin
Sitagliptin had a small effect on plasma Digoxin concentrations. Following administration of 0.25 mg Digoxin concomitantly with 100 mg of Sitagliptin daily for 10 days, the plasma AUC of Digoxin was increased on average by 11%, & the plasma Cmax on average by 18%. No dose adjustment of Digoxin is recommended. However, patients at risk of Digoxin toxicity should be monitored for this when Sitagliptin & Digoxin are administered concomitantly. In vitro data suggest that Sitagliptin does not inhibit nor induce CYP450 isoenzymes. In clinical studies, Sitagliptin did not meaningfully alter the pharmacokinetics of Metformin hydrochloride, Glyburide, Simvastatin, Rosiglitazone, Warfarin, or oral contraceptives, providing in vivo evidence of a low propensity for causing interactions with substrates of CYP3A4, CYP2C8, CYP2C9, & organic cationic transporter (OCT). Sitagliptin may be a mild inhibitor of p-glycoprotein in vivo.
Pioglitazone
Interaction studies have shown that Pioglitazone has no relevant effect on either the pharmacokinetics or pharmacodynamics of Digoxin, Warfarin, Phenprocoumon & Metformin hydrochloride. Co-administration of Pioglitazone with sulphonylureas does not appear to affect the pharmacokinetics of the sulphonylurea. Studies in man suggest no induction of the main inducible cytochrome P450, 1A, 2C8/9 & 3A4. In vitro studies have shown no inhibition of any subtype of cytochrome P450. Interactions with substances metabolised by these enzymes, e.g. oral contraceptives, Cyclosporin, Calcium channel blockers, & HMGCoAreductase inhibitors are not to be expected. Co-administration of Pioglitazone with Gemfibrozil (an inhibitor of cytochrome P450 2C8) is reported to result in a 3-fold increase in AUC of Pioglitazone. Since there is a potential for an increase in dose- related adverse events, a decrease in the dose of Pioglitazone may be needed when Gembrozil is concomitantly administered. Close monitoring of glycaemic control should be considered. Co-administration of Pioglitazone with rifampicin (an inducer of cytochrome P450 2C8) is reported to result in a 54% decrease in AUC of Pioglitazone. The Pioglitazone dose may need to be increased when rifampicin is concomitantly administered. Close monitoring of glycaemic control should be considered.
Metformin hydrochloride
Carbonic anhydrase inhibitors
Topiramate or other carbonic anhydrase inhibitors (e.g. Zonisamide, Acetazolamide or Dichlorphenamide) frequently decrease serum bicarbonate & induce non-anion gap, hyperchloremic metabolic acidosis.
Concomitant use of these drugs may induce metabolic acidosis. Use these drugs with caution in patients treated with Metformin hydrochloride, as the risk of lactic acidosis may increase.
Cationic drugs
Cationic drugs (e.g. Amiloride, Digoxin, Morphine, Procainamide, Quinidine, Quinine, Ranitidine, Triamterene, Trimethoprim, or Vancomycin) that are eliminated by renal tubular secretion theoretically have the potential for interaction with Metformin hydrochloride by competing for common renal tubular transport systems. Although such interactions remain theoretical (except for cimetidine), careful patient monitoring & dose adjustment of Metformin hydrochloride and/or the interfering drug is recommended in patients who are taking cationic medications that are excreted via the proximal renal tubular secretory system.
Drugs affecting glycemic control
Certain drugs tend to produce hyperglycemia & may lead to loss of glycemic control. These drugs include the Thiazides & other diuretics, Corticosteroids, Phenothiazines, Thyroid products, Estrogens, Oral contraceptives, Phenytoin, Nicotinic acid, Sympathomimetics, Calcium channel blockers, & Isoniazid. When such drugs are administered to a patient receiving Metformin hydrochloride, the patient should be closely observed for loss of blood glucose control. When such drugs are withdrawn from a patient receiving Metformin hydrochloride, the patient should be observed closely for hypoglycemia.
Concomitant use of Metformin hydrochloride not recommended.
Alcohol
Alcohol intoxication is associated with an increased risk of lactic acidosis, particularly in case of fasting or malnutrition or hepatic insufficiency.
Avoid consumption of Alcohol & Alcohol-containing medications.
Iodinated contrast agents
Metformin hydrochloride must be discontinued prior to, or at the time of the image procedure & not restarted until at least 48 hours after, provided that renal function has been re-evaluated & found to be stable.
Combinations requiring precautions for use
Some medicinal products can adversely affect renal function which may increase the risk of lactic acidosis, e.g. NSAIDs, including selective cyclo-oxygenase (COX) II inhibitors, ACE inhibitors, angiotensin II receptor antagonists & diuretics, especially loop diuretics. When starting or using such products in combination with Metformin hydrochloride, close monitoring of renal function is necessary.
Glucocorticoids (systemic & local routes), beta-2-agonists & diuretics have intrinsic hyperglycaemic activity. Inform the patient & perform more frequent blood glucose monitoring, especially at the beginning of treatment. If necessary, adjust the dosage of the antidiabetic drug during therapy with the other drug & upon its discontinuation. ACE-inhibitors may decrease the blood glucose levels. If necessary, adjust the dosage of the antidiabetic drug during therapy with the other drug & upon its discontinuation.
Metformin hydrochloride may decrease the anticoagulant effect of Phenprocoumon. Therefore, a close monitoring is recommended.
Levothyroxine can reduce the hypoglycemic effect of Metformin hydrochloride. Monitoring of blood glucose levels is recommended, especially when thyroid hormone therapy is initiated or stopped & the dosage of Metformin hydrochloride must be adjusted if necessary.
Organic cation transporters (OCT)
Metformin hydrochloride is a substrate of both transporters OCT1 & OCT2. Co-administration of Metformin hydrochloride with
- Inhibitors of OCT1 (such as Verapamil) may reduce efficacy of Metformin hydrochloride.
- Inducers of OCT1 (such as Rifampicin) may increase gastrointestinal absorption & efficacy of Metformin hydrochloride.
- Inhibitors of OCT2 (such as Cimetidine, Dolutegravir, Ranolazine, Trimethoprim, Vandetanib & Isavuconazole) may decrease the renal elimination of Metformin hydrochloride & thus lead to an increase in Metformin hydrochloride plasma concentration.
- Inhibitors of both OCT1 & OCT2 (such as Crizotinib, Olaparib) may alter efficacy & renal elimination of Metformin hydrochloride.
Caution is therefore advised, especially in patients with renal impairment, when these drugs are co-administered with Metformin hydrochloride, as Metformin hydrochloride plasma concentration may increase. If needed, dose adjustment of Metformin hydrochloride may be considered as OCT inhibitors / inducers may alter the efficacy of Metformin hydrochloride.
4.6 Use in special populations
This tablet must not be taken during pregnancy. The patient must change over to insulin during pregnancy. To prevent possible ingestion with the breast milk & possible harm to the child, this tablet must not be taken by breast-feeding women. If necessary the patient must change over to insulin, or must stop breast-feeding.
Pregnancy
Sitagliptin
There are no adequate data from the use of Sitagliptin in pregnant women. Studies in animals have shown reproductive toxicity at high doses. The potential risk for humans is unknown. Due to lack of human data, Sitagliptin should not be used during pregnancy.
Pioglitazone
There are no adequate human data to determine the safety of Pioglitazone during pregnancy. Foetal growth restriction was apparent in animal studies with Pioglitazone. This was attributable to the action of Pioglitazone in diminishing the maternal hyperinsulinaemia & increased insulin resistance that occurs during pregnancy thereby reducing the availability of metabolic substrates for foetal growth. The relevance of such a mechanism in humans is unclear & Pioglitazone should not be used in.
Metformin hydrochloride
Metformin hydrochloride was not teratogenic in rats & rabbits at doses up to 600 mg/kg/day, which represent 3 & 6 times the maximum recommended human daily dose of 2000 mg based on body surface area comparison for rats & rabbits, respectively. However, because animal reproduction studies are not always predictive of human response, Metformin hydrochloride should not be used during pregnancy unless clearly needed. The safety & effectiveness of Metformin hydrochloride used during labor & delivery has not been evaluated in human studies. Fertility of male or female rats was unaffected by Metformin hydrochloride when administered at doses as high as 600 mg/kg/day, which is approximately three times the maximum recommended human daily dose based on body surface area comparisons.
Lactation
It is unknown whether Sitagliptin is excreted in human breast milk. Animal studies have shown excretion of Sitagliptin in breast milk. Sitagliptin should not be used during breast-feeding. Breast-feeding must be discontinued during administration of Sitagliptin tablets in lactating women (transfer to milk in animal studies (rats) has been reported).
Studies in lactating rats show that Metformin hydrochloride is excreted into milk & reaches levels comparable to those in plasma.
Similar studies have not been conducted in nursing mothers. Thus, the potential for hypoglycemia in nursing infants after Metformin hydrochloride oral solution may exist. Metformin hydrochloride is excreted into human breast milk. No adverse effects were observed in breastfed new-borns / infants. However, as only limited data are available, breastfeeding is not recommended during Metformin hydrochloride treatment.
A decision on whether to discontinue breast-feeding should be made, taking into account the benefit of breast-feeding & the potential risk to adverse effect on the child.
Paediatric use
Safety & effectiveness of Sitagliptin in paediatric patients have not been established. The safety of Sitagliptin in low birth weight baby, new-born baby, infant, or little child has not been established. (No usage experience).
The safety & effectiveness in paediatric patients have not been established & Metformin hydrochloride is not recommended in paediatric patients below the age of 18 years. Thus, Sitagliptin / Metformin hydrochloride combination is not recommended in paediatric patients.
Geriatric use
Start with lowest dose in elderly patients due to higher risks of lactic acidosis, poor renal & hepatic functions & therefore, Sitagliptin should be administered carefully. Clinical studies of Metformin hydrochloride did not include sufcient numbers of subjects aged 65 & over to determine whether they respond differently from younger subjects. Other reported clinical experience has not identified differences in responses between the elderly & younger patients. In general, dose selection for an elderly patient should be cautious, usually starting at the low end of the dosing range, reflecting the greater frequency of decreased hepatic, renal, or cardiac function & of concomitant disease or other drug therapy & the higher risk of lactic acidosis.
As Metformin hydrochloride is excreted via the kidney & elderly patients have a tendency to decreased renal function, elderly patients taking Sitagliptin / Metformin hydrochloride should have their renal function monitored regularly.
Patients with renal impairment
Sitagliptin / Metformin hydrochloride combination is not recommended in patients with renal impairment (e.g. serum creatinine levels greater than or equal to 1.5 mg/dL for men, greater than or equal to 1.4 mg/dL for women or abnormal creatinine clearance), which may also result from conditions such as cardiovascular collapse (shock), acute myocardial infarction & septicemia.
The single administration of Sitagliptin at 20 mg in patients with renal impairment revealed no remarkable changes in Cmax & t1/2 corresponding to the level of renal impairment. Compared with healthy adult subjects, the AUC0–∞ of subjects with mild renal impairment (50 ≤ creatinine clearance [Ccr] ≤ 80 mL/minute), moderate renal impairment (30 ≤ Ccr < 50 mL/minute), & severe renal impairment (Ccr < 30 mL/minute) was approximately 1.25 times, 1.68 times, & 1.49 times higher than that of healthy adult subjects, respectively. In addition, the AUC0–43h of patients with end-stage renal failure was approximately 1.16 times higher than that of healthy adult subjects. In addition, 15.6% of the total administration dose of Sitagliptin was eliminated via hemodialysis.
A GFR should be assessed before initiation of treatment with Metformin hydrochloride containing products & at least annually thereafter. In patients at an increased risk of further progression of renal impairment & in the elderly, renal function should be assessed more frequently e.g. every 3 - 6 months.
Patients with hepatic impairment
As determined from the pharmacokinetic characteristics of Sitagliptin, the extent of increase in the exposure level of Sitagliptin in patients with mild to moderate hepatic impairment will not pose any significant safety risk. Thus no dose adjustment is proposed in hepatic impaired patients. There was no clinical experience of Sitagliptin in severe degree hepatic dysfunction patient. The presence of liver disease is a risk-factor for the development of lactic acidosis during Metformin hydrochloride therapy & the drug should be avoided in patients with hepatic insufficiency.
A single administration of Sitagliptin 20 mg in patients with hepatic impairment revealed that the Cmax of subjects with mild hepatic impairment (Child-Pugh classification : total score 5 - 6) & moderate hepatic impairment (Child-Pugh classification : total score 7 - 9) was approximately 1.25 times & 1.38 times that of healthy adult subjects, respectively. Compared to healthy adult subjects, the AUC0–∞of subjects with mild & moderate hepatic impairments was approximately 1.46 times & 1.59 times higher than that of healthy adult subjects, respectively.
There have been no previous clinical studies using Sitagliptin in patients with severe hepatic impairment (Child-Pugh classification : total score was greater than 9). Thus, specific caution is required when the drug is administered to patients with severe hepatic impairment.
4.7 Effects on ability to drive & use machines
Sitagliptin has no or negligible influence on the ability to drive & use machines. However, when driving or using machines, it should be taken into account that dizziness & somnolence have been reported. In addition, patients should be alerted to the risk of hypoglycaemia when Sitagliptin is used in combination with a sulphonylurea or with insulin.
Alertness & reactions may be impaired due to hypo- or hyperglycemia, especially when beginning or after altering treatment or when this tablet is not taken regularly. This may, for example, affect the ability to drive or to operate machinery.
Pioglitazone has no or negligible influence on the ability to drive & use machines. However, patients who experience visual disturbance should be cautious when driving or using machines.
Metformin hydrochloride monotherapy does not cause hypoglycaemia & therefore has no effect on the ability to drive or to use machines. However, patients should be alerted to the risk of hypoglycaemia when Metformin hydrochloride is used in combination with other antidiabetic agents (Sulfonylureas, Insulin, & Repaglinide).
4.8 Undesirable effects
Sitagliptin
Dipeptidyl-peptidase-4 (DPP-4) inhibitors induced arthralgia : Dipeptidyl-peptidase-4 (DPP-4) inhibitors like Sitagliptin, Vildagliptin, Saxagliptin, Sitagliptin etc. induced arthralgia.
Summary of the safety proflle
Serious adverse reactions including pancreatitis & hypersensitivity reactions have been reported. Hypoglycaemia has been reported in combination with sulphonylurea (4.7% - 13.8%) & insulin (9.6%).
Tabulated list of adverse reactions
Adverse reactions are listed below (Table 1) by system organ class & frequency. Frequencies are dened as : Very common (≥ 1/10); Common (≥ 1/100 to < 1/10); Uncommon (≥ 1/1,000 to < 1/100); Rare (≥ 1/10,000 to < 1/1,000); Very rare (< 1/10,000) & Not known (cannot be estimated from the available data).
Table 1 : The frequency of adverse reactions identified from placebo-controlled clinical studies of Sitagliptin monotherapy & post-marketing experience.
Adverse reaction |
Frequency of adverse reaction |
Blood & lymphatic system disorders |
|
Thrombocytopenia |
Rare |
Immune system disorders |
|
Hypersensitivity reactions including anaphylactic responses*† |
Frequency not known |
Metabolism & nutrition disorders |
|
Hypoglycaemia† |
Common |
Nervous system disorders |
|
Headache |
Common |
Dizziness |
Uncommon |
* Adverse reactions were identified through post-marketing surveillance.
† See TECOS Cardiovascular Safety Study below.
Description of selected adverse reactions
In addition to the drug-related adverse experiences described above, adverse experiences reported regardless of causal relationship to medication & occurring in at least 5% & more commonly in patients treated with Sitagliptin included upper respiratory tract infection & nasopharyngitis.
Additional adverse experiences reported regardless of causal relationship to medication that occurred more frequently in patients treated with Sitagliptin (not reaching the 5 % level, but occurring with an incidence of > 0.5 % higher with Sitagliptin than that in the control group) included osteoarthritis & pain in extremity.
Pioglitazone
Adverse reactions reported in excess (≥ 0.5%) of placebo & as more than an isolated case in patients receiving Pioglitazone in double-blind studies are listed below as MedDRA preferred term by system organ class & absolute frequency. Frequencies are defined as : Very common (≥ 1/10); Common (≥ 1/100 to < 1/10); Uncommon (≥ 1/1,000 to < 1/100); Rare (≥ 1/10,000 to < 1/1,000); Very rare (< 1/10,000); Not known (cannot be estimated from the available data). Within each system organ class, adverse reactions are presented in order of decreasing incidence followed by decreasing seriousness. Infections & infestations : common : upper respiratory tract infection, bronchitis. Uncommon : sinusitis.
Neoplasms benign, malignant & unspecified (including cysts & polyps) : uncommon bladder cancer.
Blood & lymphatic system disorders : anaemia.
Immune system disorders : not known : Hypersensitivity & allergic reactions 1.
Metabolism & nutrition disorders : hypoglycaemia, appetite increased. Nervous system disorders : hypo-aesthesia, headache, dizziness, insomnia. Eye disorders : visual disturbance 2, macular oedema
Ear & labyrinth disorders : vertigo
Cardiac disorders : heart failure 3
Respiratory, thoracic & mediastinal disorders: dyspnoea.
Gastrointestinal disorders : flatulence
Skin & subcutaneous tissue disorders : sweating
Musculoskeletal & connective tissue disorders : fracture bone, arthralgia, back pain
Renal & urinary disorders : haematuria, glycosuria, proteinuria
Reproductive system & breast disorders : erectile dysfunction. General disorders & administration site conditions: oedema 5, fatigue
Investigations : weight increased 6, blood creatine phospho-kinase increased, increased lactic dehydro- genase & alanine aminotransferase increased 7.
Description of selected adverse reactions :
1. Post-marketing reports of hypersensitivity reactions in patients treated with Pioglitazone have been reported. These reactions include anaphylaxis, angioedema, & urticaria.
2. Visual disturbance has been reported mainly early in treatment & is related to changes in blood glucose due to temporary alteration in the turgidity & refractive index of the lens as seen with other hypoglycaemic treatments.
3. In controlled clinical trials the incidence of reports of heart failure with Pioglitazone treatment was the same as in placebo, Metformin hydrochloride & sulphonylurea treatment groups, but was increased when used in combination therapy with insulin. In an outcome study of patients with pre-existing major macrovascular disease, the incidence of serious heart failure was 1.6% higher with Pioglitazone than with placebo, when added to therapy that included insulin. However, this did not lead to an increase in mortality in this study. In this study in patients receiving Pioglitazone & insulin, a higher percentage of patients with heart failure was observed in patients aged ≥ 65 years compared with those less than 65 years (9.7% compared to 4.0%). In patients on insulin with no Pioglitazone the incidence of heart failure was 8.2% in those ≥ 65 years compared to 4.0% in patients less than 65 years. Heart failure has been reported with marketing use of Pioglitazone, & more frequently when Pioglitazone was used in combination with insulin or in patients with a history of cardiac failure.
4. A pooled analysis was conducted of adverse reactions of bone fractures from randomised, comparator controlled, double blind clinical trials in over 8,100 patients in the Pioglitazone-treated groups & 7,400 in the comparatortreated groups of up to 3.5 years duration. A higher rate of fractures was observed in women taking Pioglitazone (2.6%) versus comparator (1.7%). No increase in fracture rates was observed in men treated with Pioglitazone (1.3%) versus comparator (1.5%).
5. In the 3.5 year PROactive study, 44/870 (5.1%) of Pioglitazone-treated female patients experienced fractures compared to 23/905 (2.5%) of female patients treated with comparator. No increase in fracture rates was observed in men treated with Pioglitazone (1.7%) versus comparator (2.1%). Post- marketing, bone fractures have been reported in both male & female patients.
6. Oedema was reported in 6 - 9% of patients treated with Pioglitazone over one year in controlled clinical trials. The oedema rates for comparator groups (sulphonylurea, Metformin hydrochloride) were 2 - 5%. The reports of oedema were generally mild to moderate & usually did not require discontinuation of treatment.
7. In active comparator controlled trials mean weight increase with Pioglitazone given as monotherapy was 2 - 3 kg over one year. This is similar to that seen in a sulphonylurea active comparator group. In combination trials Pioglitazone added to Metformin hydrochloride resulted in mean weight increase over one year of 1.5 kg & added to a sulphonylurea of 2.8 kg. In comparator group's addition of sulphonylurea to Metformin hydrochloride resulted in a mean weight gain of 1.3 kg & addition of Metformin hydrochloride to a sulphonylurea a mean weight loss of 1.0 kg.
8. In clinical trials with Pioglitazone the incidence of elevations of ALT greater than three times the upper limit of normal was equal to placebo but less than that seen in Metformin hydrochloride or sulphonylurea comparator groups. Mean levels of liver enzymes decreased with treatment with Pioglitazone. Rare cases of elevated liver enzymes & hepatocellular dysfunction have occurred in post-marketing experience. Although in very rare cases fatal outcome has been reported, causal relationship has not been established.
The following adverse reactions have been identified during post-approval use of Pioglitazone. Because these reactions are reported voluntarily from a population of uncertain size, it is generally not possible to reliably estimate their frequency or establish a causal relationship to drug exposure.
- New onset or worsening diabetic macular oedema with decreased visual acuity.
- Fatal & non-fatal hepatic failure.
Post-marketing reports of congestive heart failure have been reported in patients treated with Pioglitazone, both with & without previously known heart disease & both with & without concomitant insulin administration. In post-marketing experience, there have been reports of unusually rapid increases in weight & increases in excess of that generally observed in clinical trials. Patients who experience such increases should be assessed for fluid accumulation & volume-related events such as excessive oedema & congestive heart failure.
Metformin hydrochloride
Gastrointestinal symptoms such as nausea, vomiting, diarrhea, abdominal pain & loss of appetite (> 10%) are very common : these occur most frequently during initiation of therapy & resolve spontaneously in most cases. To prevent these gastrointestinal symptoms, it is recommended that Metformin hydrochloride be taken in 2 or 3 daily doses during or after meals. As low increase of the dose may also improve gastrointestinal tolerability.
- Metallic taste (3%) is common.
- Mild erythema has been reported in some hypersensitive individuals. The incidence of such effects is regarded as very rare (< 0.01%).
- A decrease of vitamin B12 absorption with decrease of serum levels has been observed inpatients treated long-term with Metformin hydrochloride & appears generally to be without clinical significance (< 0.01%).
- However, cases of peripheral neuropathy in patients with Vitamin B12 deficiency have been reported in post-marketing experience (frequency not known).
- Lactic acidosis (0.03 cases / 1000 patient-years) is very rare.
- Hemolytic anemia (frequency unknown)
- Reduction of thyrotropin level in patients with hypothyroidism (frequency unknown)
- Hypomagnesemia in the context of diarrhea (frequency unknown)
- Encephalopathy (frequency unknown)
- Photosensitivity (frequency unknown)
- Hepatobiliary disorders : Reports of liver function tests abnormalities & hepatitis resolving upon Metformin hydrochloride discontinuation.
- In post marketing data & in controlled clinical studies, adverse event reporting in patients treated with Metformin hydrochloride SR was similar in nature & severity to that reported in patients treated with Metformin hydrochloride immediate release.
During treatment initiation, the most common adverse reactions are nausea, vomiting, diarrhoea, abdominal pain & loss of appetite, which resolve spontaneously in most cases.
Laboratory tests
Vitamin B12 concentrations : Metformin hydrochloride may lower serum Vitamin B12 concentrations. Measurement of hematologic parameters on an annual basis is advised in patients on Metformin hydrochloride & any apparent abnormalities should be appropriately investigated & managed.
Reporting of suspected adverse reactions
Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit / risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via email to : medico@zuventus.com
Website : https://www.zuventus.com/drug-safety-reporting
By reporting side effects, you can help provide more information on the safety of this medicine.
4.9 Overdose
Sitagliptin
During controlled clinical trials in healthy subjects, single doses of up to 800 mg Sitagliptin were administered.
Minimal increases in QTc, not considered to be clinically relevant, were observed in one study at a dose of 800 mg Sitagliptin. There is no experience with doses above 800 mg in clinical studies. In Phase I multiple-dose studies, there were no dose-related clinical adverse reactions observed with Sitagliptin with doses of up to 600 mg per day for periods of up to 10 days & 400 mg per day for periods of up to 28 days. In the event of an overdose, it is reasonable to employ the usual supportive measures, e.g. remove unabsorbed material from the gastrointestinal tract, employ clinical monitoring (including obtaining an electrocardiogram), & institute supportive therapy if required. Sitagliptin is modestly dialysable. In clinical studies, approximately 13.5 % of the dose was removed over a 3- to 4-hour haemodialysis session. Prolonged haemodialysis may be considered if clinically appropriate. It is not known if Sitagliptin is dialysable by peritoneal dialysis.
Pioglitazone
In clinical studies, patients have taken Pioglitazone at higher than the recommended highest dose of 45 mg daily. The maximum reported dose of 120 mg/day for four days, then 180 mg/day for seven days was not associated with any symptoms. Hypoglycaemia may occur in combination with sulphonylureas or insulin. Symptomatic & general supportive measures should be taken in case of overdose.
Metformin hydrochloride
No cases of overdose were reported during Metformin hydrochloride clinical trials. It would be expected that adverse reactions of a more intense character including epigastric discomfort, nausea, & vomiting followed by diarrhea, drowsiness, weakness, dizziness, malaise & headache might be seen. Should those symptoms persist, lactic acidosis should be excluded.
Overdose of Metformin hydrochloride has occurred, including ingestion of amounts greater than 50 g. Hypoglycemia was reported in approximately 10% of cases, but no causal association with Metformin hydrochloride has been established. Lactic acidosis has been reported in approximately 32% of Metformin hydrochloride overdose cases.
Metformin hydrochloride is dialyzable with a clearance of up to 170 mL/min under good hemodynamic conditions.
Therefore, hemodialysis may be useful for removal of accumulated drug from patients in whom Metformin hydrochloride over dosage is suspected.