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Istamet 50/500mg Tablet 15s

Istamet 50/500mg Tablet 15s is an oral anti-diabetic combination medication containing Metformin (a biguanide) and Sitagliptin (a DPP-4 inhibitor). It is used to improve glycaemic control in adults with type 2 diabetes mellitus as an adjunct to diet and exercise. This combination is typically prescribed when blood sugar levels are not adequately controlled by a single medicine alone. By combining two medicines with distinct yet complementary mechanisms, Istamet 50/500mg Tablet 15s effectively lowers both fasting and post-meal blood glucose levels. It is primarily available as oral tablets, including immediate-release and extended-release (ER/XR) formulations.

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Written by: Shaik Ashraf Ali, B.pharmacy

Reviewed by: Dr. Jay Faldu, MBBS

Last updated on: 11-05-2026

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Istamet 50/500mg Tablet 15s
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Istamet 50/500mg Tablet 15s
Istamet 50/500mg Tablet 15s
Istamet 50/500mg Tablet 15s
Istamet 50/500mg Tablet 15s
Istamet 50/500mg Tablet 15s

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Detailed Description

Istamet 50/500mg Tablet 15s is a prescription medicine used to help control blood sugar levels in adults with type 2 diabetes mellitus. It contains two active ingredients that work in complementary ways to improve glucose regulation.

Metformin belongs to the biguanide class. It lowers blood sugar by reducing glucose production in the liver, improving the body’s sensitivity to insulin, and slowing the absorption of sugar from food in the intestines. Sitagliptin is a dipeptidyl peptidase‑4 (DPP‑4) inhibitor. It increases the levels of natural incretin hormones, which help the pancreas release more insulin after meals and reduce the amount of glucose produced by the liver.

This combination is prescribed when diet, exercise, and single‑agent therapy are not sufficient to achieve adequate blood sugar control. By working together, Metformin and Sitagliptin may help lower blood sugar throughout the day, particularly after meals, and may reduce the risk of long‑term complications of type 2 diabetes, such as cardiovascular disease, chronic kidney disease, and diabetic neuropathy.

Your doctor will determine the most appropriate dose and formulation for your condition, and regular monitoring of blood sugar and kidney function is usually recommended during treatment.

Uses of Istamet 50/500mg Tablet 15s

Istamet 50/500mg Tablet 15s may be indicated by your doctor for:

Type 2 Diabetes Mellitus

To improve blood sugar control in adults who are not sufficiently controlled on metformin or sitagliptin alone.

Replacement Therapy

For patients already stabilised on separate doses of metformin and sitagliptin.

Initial Therapy

In some clinical cases, the patient's baseline blood sugar levels are high enough to require dual therapy from the start.

Benefits of Istamet 50/500mg Tablet 15s

Istamet 50/500mg Tablet 15s may provide benefits such as:

  • Dual‑action glucose-lowering that targets both liver glucose output and pancreatic insulin response
  • Significant reduction in HbA1c, supporting achievement of target glycaemic goals
  • Lower risk of hypoglycaemia compared to some other classes of diabetes medications, like sulfonylureas
  • Weight‑neutral profile with minimal risk of weight gain
  • Favourable safety record with good tolerability in most patients
  • Simplified treatment schedule through a single combination tablet, available in immediate‑release and extended‑release (ER/XR) formulations

Side Effects of Istamet 50/500mg Tablet 15s

Istamet 50/500mg Tablet 15s is generally well-tolerated, but side effects can occur, particularly during the initiation of therapy.

Common side effects of Istamet 50/500mg Tablet 15s may include
  • Stomach upset, nausea, or diarrhoea
  • Mild headache
  • Cold‑like symptoms such as a runny nose or sore throat
Uncommon side effects of Istamet 50/500mg Tablet 15s may include
  • Skin rash or itching
  • Joint or muscle pain
  • Changes in taste
  • Mild swelling of hands or feet
Serious side effects that may require immediate medical attention include
  • Lactic acidosis: a rare but serious build‑up of acid in the blood (symptoms may include severe tiredness, muscle pain, or difficulty breathing)
  • Pancreatitis: inflammation of the pancreas (symptoms may include severe abdominal pain that may radiate to the back)
  • Liver function changes: rare elevations in liver enzymes that may require monitoring
  • Severe allergic reactions: swelling of the face, lips, or throat, or difficulty breathing

Always consult your doctor if you notice any unusual symptoms while taking Istamet 50/500mg Tablet 15s.

Directions for Use

Use Istamet 50/500mg Tablet 15s exactly as directed by your doctor.

  • Take the tablet with meals to help reduce the risk of stomach upset or diarrhoea
  • Usually taken once or twice daily, depending on the formulation (immediate‑release or extended‑release) and your doctor’s advice
  • Swallow the extended‑release (ER/XR) tablets whole. Do not crush, chew, or break them
  • Try to take your medication at the same time each day to maintain consistency
  • Regularly check your blood sugar as instructed by your healthcare provider
  • Do not stop taking Istamet 50/500mg Tablet 15s unless advised by your doctor

How it works

Istamet 50/500mg Tablet 15s helps control blood sugar in type 2 diabetes by combining two medicines with different actions.

Metformin lowers the amount of glucose produced by the liver, improves the body’s sensitivity to insulin, and slows the absorption of sugar from food in the intestines.

Sitagliptin increases levels of natural hormones (incretins) that stimulate the pancreas to release more insulin after meals and reduce the amount of glucose made by the liver.

Together, these actions help maintain steadier blood sugar levels throughout the day, especially after eating, and support long‑term management of type 2 diabetes.

Safety Advice for Istamet 50/500mg Tablet 15s

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Pregnancy
Caution

Use only if clearly indicated. Insulin is usually preferred for blood glucose control during pregnancy. Your doctor may assess risk versus benefit before use.

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Breastfeeding
Caution

Metformin is present in breast milk in small amounts. Data for sitagliptin in breastfeeding are limited. Your doctor may decide whether to continue or avoid therapy.

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Driving
Caution

The combination does not usually affect alertness. Caution is needed if low blood sugar occurs, especially when used with insulin or sulfonylureas.

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Liver
Caution

Use with caution in liver disease. Severe liver impairment may increase the risk of metabolic complications. Your doctor may monitor liver function if required.

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Kidney
Caution

Not recommended in severe kidney impairment. Metformin is contraindicated in advanced renal disease due to risk of lactic acidosis. Sitagliptin dosing depends on kidney function. Regular kidney monitoring is required.

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Alcohol
Caution

Avoid excessive alcohol use. Alcohol may increase the risk of lactic acidosis with metformin and may also affect blood glucose control.

Quick Tips for Istamet 50/500mg Tablet 15s

  • Gastrointestinal side effects (like diarrhoea) are common when starting; they usually improve within a week or two as your body adjusts.
  • Always carry a fast-acting sugar source (like glucose tablets or fruit juice) in case of a rare hypoglycaemic episode.
  • If you are scheduled for an X-ray or CT scan involving iodinated contrast dye, you must temporarily stop this medication, as it can affect your kidneys.
  • Regularly check your feet for sores or infections, as foot care is vital for anyone managing diabetes.
  • Ensure you have your kidney function tested at least once a year while taking this medication.

Storage Advice

Store Istamet 50/500mg Tablet 15s at room temperature in a dry place away from direct sunlight and heat.

  • Keep the tablets in their original container or blister pack.
  • Do not store in the bathroom where moisture levels are high.
  • Keep out of the reach of children and pets.
  • Do not use after the expiry date.

Drug-Food Interaction

  • Alcohol (SEVERE): Drinking alcohol while taking Istamet 50/500mg Tablet 15s may increase the risk of lactic acidosis. Your doctor will advise you to avoid or limit alcohol intake.
  • Food intake (CONSULT YOUR DOCTOR): You should take Istamet 50/500mg Tablet 15s with meals, as this may help reduce stomach upset and improve tolerability.
  • High‑fat meals (MILD): Eating very high‑fat meals may worsen gastrointestinal side effects in some patients.

Interactions with Other Drugs

  • Insulin or sulfonylureas (MODERATE): Using Istamet 50/500mg Tablet 15s with insulin or sulfonylureas may increase the risk of hypoglycaemia. Your doctor may adjust your dose or monitor your blood sugar more closely.
  • Iodinated contrast media (SEVERE): Istamet 50/500mg Tablet 15s should be stopped before and after certain imaging procedures to protect kidney function. Your doctor will advise you when to restart the medicine.
  • Diuretics (CAUTION): Diuretics may affect kidney function and increase the risk of lactic acidosis. Your doctor may monitor your kidney health if you are taking both medicines.
  • ACE inhibitors and NSAIDs (CAUTION): These medicines may reduce kidney clearance and increase Metformin exposure. Your doctor may recommend monitoring.

Drug-Disease Interactions

  • Kidney disease (SEVERE): Istamet 50/500mg Tablet 15s may increase the risk of lactic acidosis in patients with reduced kidney function. Your doctor will guide you with dose adjustments or monitoring based on your individual condition.
  • Liver disease (CAUTION): Impaired liver function may increase the chance of side effects. Your doctor may recommend regular monitoring.
  • Heart failure (CAUTION): Patients with unstable or severe heart failure may have a higher risk of lactic acidosis. Your doctor will decide if Istamet 50/500mg Tablet 15s is suitable for you.
  • Pancreatic disease (SEVERE): Sitagliptin has been linked to rare cases of pancreatitis. If you have a history of pancreatic problems, your doctor will advise you carefully.
  • Severe infections or dehydration (MODERATE): These conditions may increase the risk of lactic acidosis. Your doctor may temporarily adjust your treatment if needed.

Overdose

Taking more than the prescribed dose of this medicine can be harmful. An overdose can cause severe stomach upset or lead to lactic acidosis and low blood sugar. If you suspect an overdose, contact emergency medical services or a poison control centre immediately.

What If You Forget to take Istamet 50/500mg Tablet 15s?

Take the missed dose as soon as you remember with food. If it is almost time for your next dose, skip the missed one and return to your regular schedule. Do not take two doses at the same time to make up for a missed application.

FAQ

Fact Box

Therapeutic Class

Antidiabetic combination therapy

Action Class

Antihyperglycaemic agent (Metformin) + Incretin enhancer (Sitagliptin)

Chemical Class

Biguanide (Metformin) + DPP‑4 inhibitor (Sitagliptin)

Habit Forming

No

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PlatinumRx is committed to providing reliable and accurate information to support informed customer decisions. However, all information made available on the Platform, including product descriptions, comparisons, and other content, is provided solely for general informational purposes. Such information is not intended to diagnose, prevent, treat, or cure any medical condition, nor should it be relied upon as a substitute for professional medical advice, diagnosis, or treatment.

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