Metformin
About Metformin
Metformin is a prescription medicine used to help control high blood sugar levels in people with type 2 diabetes. It works by helping the body use insulin more effectively, which helps keep blood sugar levels under control. Managing blood sugar levels can help reduce the risk of diabetes-related complications.
Take Metformin exactly as prescribed by your doctor. It is usually taken with food to reduce the chance of stomach upset. Taking the medicine regularly, along with a healthy diet and regular exercise, helps improve blood sugar control.
Some people may experience mild side effects such as nausea, stomach discomfort, or bloating when starting treatment. These effects are usually temporary and improve as the body adjusts to the medicine. Contact your doctor immediately if you develop severe weakness, trouble breathing, or persistent muscle pain.
Before taking Metformin, inform your doctor if you have any kidney or liver problems. This medicine is not suitable for people with severe kidney disease or severe dehydration. Your doctor may recommend blood tests to check your kidney and liver function before and during treatment.
Avoid excessive alcohol consumption while taking this medicine, as it may increase the risk of a rare but serious side effect. Tell your doctor if you are pregnant, planning to become pregnant, or breastfeeding, or if you are older than 65 years, so they can determine whether this medicine is right for you.
Uses of Metformin
Medicinal Benefits
Metformin provides reliable, daily support to help you manage your health and avoid the physical toll of fluctuating blood sugar levels. By keeping your blood sugar stable, this medicine brings several key health benefits:
- Reduced Fatigue associated with high blood sugar: By helping your body convert sugar from food into usable energy more efficiently, it helps reduce the sluggishness and constant tiredness often caused by high blood sugar.
- Protection Against Long-Term Complications: Consistent use protects your vital organs, lowering your risk of future complications such as kidney damage, vision loss, nerve pain, and cardiovascular concerns.
- Weight-Neutral Support: Unlike many other blood sugar medications that can cause unwanted weight gain, this medicine helps maintain a stable weight and may support modest weight reduction in some individuals. However, weight-loss effects are generally modest and can vary considerably from person to person.
Directions for Use
To get the full benefit of Metformin and minimise side effects, follow these simple guidelines:
- Take the tablet orally, usually with your morning or evening meal, depending on your doctor's instructions. Taking it with food significantly reduces stomach upset.
- Swallow the tablet whole with a full glass of water. Do not crush, chew, or break the tablet, as this can interfere with the medicine’s release into your body.
- Try to take your dose at the same time every day to establish a consistent routine and keep a steady level of the medicine in your bloodstream.
- Always follow your doctor's exact instructions regarding how many tablets to take and when to take them. Never adjust your dose without speaking to your doctor first.
Storage
Side Effects of Metformin
Common Side Effects (Usually mild):
- Upset stomach, mild nausea, or vomiting
- Diarrhoea or loose stools, especially when first starting the medicine
- A temporary metallic taste in your mouth
- Mild gas, bloating, or abdominal discomfort
Serious Side Effects (Consult your doctor right away):
- Signs of a rare condition called lactic acidosis, which include unusual muscle pain, trouble breathing, deep or rapid breathing, severe stomach pain, persistent vomiting, extreme fatigue, deep sleepiness, or a cold feeling in your hands or feet
- Signs of a severe allergic reaction, such as a skin rash, itching, hives, swelling of the face, lips, tongue, or throat, or severe dizziness
- Severe, ongoing diarrhoea or vomiting that makes it difficult to keep fluids down, which can lead to dangerous dehydration
Medicines Containing this Salt
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Drug Warnings
- Plan for Medical Scans: If you are scheduled for an X-ray, CT scan, or any imaging test that requires iodinated contrast dye, inform your doctor. Whether Metformin needs to be temporarily stopped depends on your kidney function (eGFR) and the type of imaging procedure. Your healthcare provider will determine if any interruption is necessary and when it is safe to restart treatment.
- Inform Your Surgeon: Always let your surgeon or dentist know you are taking this medicine before any scheduled surgical procedure, as you may need to pause it temporarily.
- Monitor Your Kidney Function: Ensure you get your routine blood tests done as scheduled by your doctor, as your kidney health must be checked at least once a year while taking this medicine.
- Watch for Vitamin B12 Levels: Long-term use of this medicine can sometimes lower your body's absorption of vitamin B12. Talk to your doctor about checking your levels if you experience unusual tingling in your hands or feet or extreme tiredness.
- Limit Alcohol Intake: Avoid drinking heavy amounts of alcohol while on this medication, as alcohol significantly increases the risk of serious liver strain and lactic acid accumulation.
Drug Interactions
Drug-Drug Interactions:
Inform your doctor if you are taking any of the following medicines, as they may interact.
- Water Pills (Diuretics): Taking these with Metformin can affect your blood sugar levels and increase the risk of dehydration, requiring more frequent monitoring.
- Corticosteroids: Medicines used to treat inflammation (like prednisone) can raise your blood sugar, which may reduce the effectiveness of your treatment.
- Contrast Dyes: Iodinated contrast media used during imaging scans may require temporary interruption of Metformin in certain patients, particularly those with significantly reduced kidney function (eGFR below 30 mL/min/1.73 m²), acute kidney injury, or selected high-risk procedures. Your healthcare provider will assess your kidney function and advise whether Metformin should be paused and when it can be restarted.
Drug-Food Interactions
Alcohol: Excessive alcohol consumption can significantly increase the risk of lactic acidosis, a rare but potentially life-threatening complication associated with Metformin. Alcohol-related low blood sugar is uncommon with Metformin alone but may occur when Metformin is taken together with other diabetes medicines that can cause hypoglycaemia, such as insulin or sulfonylureas.
Drug-Disease Interactions:
Inform your doctor if you have a history of the following conditions before taking Metformin, as it may worsen your condition or cause complications.
- Severe Kidney Disease: This medicine is filtered through your kidneys. If you have severe kidney impairment, the drug can build up in your body, which can be highly dangerous.
- Severe Liver Damage: A compromised liver cannot clear lactic acid efficiently, which raises the risk of acid build-up when taking this medicine.
- Dehydration or Severe Infection: Conditions that cause severe fluid loss or low oxygen levels (like heart failure or severe lung disease) can make taking this medicine unsafe due to the risk of lactic acidosis.
Drug-Drug Interactions Checker List:
Safety Advice
Alcohol
unsafeIt is advisable not to consume alcohol along with Metformin to avoid unpleasant side effects like lactic acidosis.
Pregnancy
cautionConsult the doctor if you are pregnant. This medicine should be used during pregnancy only if clearly needed.
Breast Feeding
cautionMetformin is not recommended if you are breastfeeding or if you are planning to breastfeed your baby.
Driving
safe if prescribedMetformin may not affect your ability to drive. However, drive or operate machinery only if you are alert.
Liver
cautionMetformin to be taken with caution, especially if you have a history of liver diseases/conditions. The dose may have to be adjusted by your doctor.
Kidney
cautionMetformin to be taken with caution, especially if you have a history of kidney diseases/conditions. The dose may have to be adjusted by your doctor depending on your renal function. Metformin is not recommended in severe kidney disease. Regular monitoring of kidney function tests is therefore important if you're taking Metformin.
Children
cautionMetformin is not recommended for children below 10 years of age. For children above 10 years, the dose will be recommended by the doctor.
Habit Forming
Diet & Lifestyle Advise
- Invest at least 150 minutes of your week in moderate-intensity physical activity, or 1 hour and 15 minutes of high-intensity exercise.
- Losing weight gradually to achieve a healthy body mass index (18.5 to 24.9).
- Replace refined carbohydrate-containing foods with whole-grain foods, and increase intake of fruits, veggies, and other fibre-rich foods.
- Reduce intake of saturated fat (or hidden fats) in food like chips, crisps, pastries, biscuits, and samosas. Choose omega-3 fatty acid-containing oils for daily cooking. For frying, you can use palm oil, mustard oil, groundnut oil, rice bran oil, and safflower oil.
- Avoid excessive stress, as it may elevate your blood sugar levels. You can adopt stress management techniques like mindfulness, meditation, or yoga to help control stress-related blood sugar changes.
- Opt for low-fat dairy products (low-fat yoghurt, fat-free milk, cheese, etc.).
- Keep your blood pressure as close to normal (140/90) as possible, as this reduces the risk of cardiovascular disease in patients with diabetes.
- Try to quit smoking and reduce your intake of carbohydrate-rich foods such as potatoes, rice, mangoes, bread, and sugar.
Special Advise
- Keep taking Metformin even if you think your blood sugar levels are under control.
- Take short, frequent meals, and avoid prolonged fasting when taking Metformin. Beware of symptoms of hypoglycaemia (low blood sugar), which include sweating, dizziness, palpitations, shivering, intense thirst, dry mouth, dry skin, frequent urination, etc. Whenever you experience any of the above-mentioned symptoms, immediately consume 5-6 candies, 3 glucose biscuits, or 3 teaspoons of honey or sugar/sugar. Make sure to carry these with you at all times, especially during long travels.
- Avoid drinking alcohol while on Metformin as it increases the risk of hypoglycaemia (a decrease in blood sugar, which might be fatal in some cases) and lactic acidosis (when the lactic acid increases in the body, which impacts the functioning of various organs in the body).
- Remember, lifestyle modifications are the most important step in controlling blood sugar levels.
Patients Concern
Disease/Condition Glossary
Type 2 diabetes: It is a chronic or lifelong disease that keeps the body from properly utilising insulin. Hence, people affected with type 2 diabetes either do not produce enough insulin or there is resistance to the action of insulin. Middle-aged or older individuals are most likely to suffer from type 2 diabetes, so it is also known as adult-onset diabetes. Symptoms of type 2 diabetes include increased thirst, frequent urination at night, slow wound healing, increased hunger, fatigue, and blurred vision. In some cases, there may be weight gain, while in rare cases, weight loss may be observed. The complications of type 2 diabetes also include neuropathy (nerve problems), nephropathy (kidney problems), retinopathy (damaged retina of eyes or blindness), loss of limbs, sexual dysfunction, and increased chance of heart attack or stroke.
FAQs
Metformin is used to treat type 2 diabetes mellitus.
Metformin lowers blood glucose levels by reducing glucose production in the liver, decreasing glucose absorption from food, and improving the body's response to insulin.
Some patients experience modest weight loss when taking Metformin. This may be related to its effects on insulin regulation and a possible reduction in appetite, although the exact mechanism is not fully understood. The effect varies between individuals, and many people experience little or no weight change. Metformin is not a weight-loss drug and should be combined with a healthy diet and regular exercise for overall health and diabetes management.
Yes, but consult your doctor before taking Metformin with insulin, as the combination may increase the risk of low blood sugar.
Try to take your medicine at the scheduled time, and do not skip your doses. If you forget to take Metformin, do not take a double dose to make up for your forgotten dose. Taking an overdose might cause your sugar level to fall rapidly. Try to take the next dose at the usual time.
Do not take excessive alcohol while taking Metformin, as this may increase the risk of a life-threatening condition called lactic acidosis (too much lactic acid in the body), which causes symptoms like dizziness, drowsiness, muscle pain, fast, shallow breathing, etc.
Contact your doctor before having an X-ray or scan which involves the injection of contrast materials that contain iodine into your bloodstream, as it may affect your kidney function.
Yes, you may need to stop Metformin before major surgery. Your doctor will advise when to stop and restart the medicine.
No. Metformin is only prescribed for the treatment of type 2 diabetes, also called non-insulin-dependent diabetes. It is not indicated for type 1 diabetes.
Metformin should be swallowed as a whole with water. Taking it with or after a meal helps prevent side effects affecting digestion.
Metformin may not make you sleepy. Consult the doctor if you experience sleepiness, as it could be a sign of ketoacidosis.
Symptoms of lactic acidosis include abdominal pain, vomiting, muscle cramps, difficulty breathing, reduced body temperature and heartbeat, and severe tiredness. Consult the doctor if you experience these symptoms.
Metformin can be used during pregnancy only if prescribed by the doctor. Please consult the doctor if you are pregnant, planning for pregnancy or think you may be pregnant.
Metformin may cause side effects like nausea, vomiting, diarrhoea, abdominal pain, and loss of appetite. Most of these side effects do not require medical attention and resolve gradually overtime. However, if the side effects persist or worsen, consult the doctor.
Store Metformin at room temperature, in a dry place. Keep it out of sight and reach of children.
It is highly recommended to take Metformin with a meal rather than on an empty stomach. Taking it with food helps reduce common digestive side effects, such as nausea, bloating, and stomach upset. Talk to your doctor or pharmacist if you struggle with stomach discomfort.
You may begin to see improvements in your blood sugar levels within a couple of weeks of starting Metformin, though it can take up to several weeks or months to see its full effect. Your doctor will monitor your blood sugar to ensure the medicine is working correctly. Talk to your doctor if your blood sugar remains high.
Mild diarrhoea is a common side effect when first starting Metformin or when gradually increasing your dose. This usually improves within a few weeks as your body adjusts. If the diarrhoea is severe, watery, or does not go away, contact your healthcare provider to ensure you do not become dehydrated. Talk to your doctor or pharmacist.
When taken on its own, Metformin rarely causes low blood sugar because it does not force your body to produce more insulin. However, if you take it alongside other diabetes medications, such as insulin or sulfonylureas, your risk of low blood sugar increases. Talk to your doctor or pharmacist about how to manage low blood sugar symptoms.
