![]() It's also used to help prevent type 2 diabetes if you're at high risk of developing it. For a full list, see the leaflet inside your medicine packet.Metformin is a medicine used to treat type 2 diabetes and gestational diabetes. These are not all the side effects of metformin. ![]() If your vitamin B12 levels become too low, vitamin B12 supplements will help. This can make you feel very tired, breathless and faint, so your doctor may check the vitamin B12 level in your blood. ![]() Taking metformin can cause vitamin B12 deficiency if you take it for a long time. ![]() These can be signs of a serious allergic reaction and may need immediate treatment in hospital. You or the person who's unwell may also have a rash that's swollen, raised, itchy, blistered or peeling. a child is limp, floppy or not responding like they normally do (their head may fall to the side, backwards or forwards, or they may find it difficult to lift their head or focus on your face).you suddenly become very confused, drowsy or dizzy.your skin, tongue or lips turn blue, grey or pale (if you have black or brown skin, this may be easier to see on the palms of your hands or soles of your feet).your throat feels tight or you're struggling to swallow.you're breathing very fast or struggling to breathe (you may become very wheezy or feel like you're choking or gasping for air).your lips, mouth, throat or tongue suddenly become swollen.In rare cases, it's possible to have a serious allergic reaction ( anaphylaxis) to metformin. the whites of your eyes turn yellow, or your skin turns yellow, although this may be less obvious on brown or black skin – this can be a sign of liver problems.you get a general feeling of being unwell with severe tiredness, fast or shallow breathing, being cold and a slow heartbeat.Serious side effects are rare and happen in less than 1 in 10,000 people.Ĭall your doctor or call 111 straight away if: Make sure your friends and family know about your diabetes and the symptoms of low blood sugar levels so they can recognise a hypo if it happens. You may also need to eat a starchy carbohydrate, like a sandwich or a biscuit, to maintain your blood sugar for longer.Ĭall your doctor or call 111 if taking in sugar does not help, or the hypo symptoms come back If you're planning to exercise more than usual, make sure you eat carbohydrates like bread, pasta or cereals before, during or after exercise.Īlways carry a fast-acting carbohydrate with you, like sugar cubes, fruit juice or some sweets, in case your blood sugar level gets low. To prevent hypoglycaemia, it's important to have regular meals, including breakfast. have a hormone disorder, such as an underactive thyroid (hypothyroidism).take some other medicines or herbal remedies at the same time.drink alcohol, especially after skipping a meal.exercise too much without eating enough carbohydrates.do not eat a healthy diet and are not getting enough nutrients.do not eat meals at regular times or skip meals.take too much of some types of diabetes medicines.If this happens, it can make you feel sweaty, tired and confused when you wake up. It's also possible for your blood sugar to go too low while you're asleep. But hypos can happen when you take metformin with other diabetes medicines, such as insulin or gliclazide.Įarly warning signs of low blood sugar include: Metformin does not usually cause low blood sugar (known as hypoglycaemia, or "hypos") when taken on its own. If they are too low, they may prescribe B12 vitamin supplements. Your doctor can check your vitamin B12 serum levels. have pale or yellow skin (this may be less obvious on brown or black skin.Call your doctor or call 111 straight away if you: Taking metformin can cause vitamin B12 deficiency. If this advice does not help and any of these side effects continue to bother you, tell your doctor or pharmacist.
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