About My Meformin - Important Information for Patients
When do I take Metformin?
When do I take Metformin?
You are advised to take metformin during or just after meals to reduce the chance of stomach side effects. If you only take one tablet a day, this should be with your evening meal.
What are the Side Effects of Metformin?
Some people who take metformin might experience gastrointestinal side effects (nausea, vomiting, diarrhoea, abdominal pain, poor appetite, altered taste). These are quite common when metformin is first started and usually resolve on their own. If you suffer from any of these side effects, you can try the suggestions on the NHS website to help relieve symptoms. If still ongoing or becoming more severe, let your doctor know.
Rarely, metformin can cause liver issues so if you notice yellowing of your skin or eyes, contact your doctor or call 111 as soon as possible.
Metformin has been found to cause vitamin B12 deficiency in some people. This can cause tiredness or muscle weakness as well as sometimes causing sores on the tongue or in the mouth. If any concerns, contact your doctor.
The purpose of metformin is to reduce your blood sugar level. However sometimes it can bring down your blood sugar levels too quickly (hypoglycaemia). This may cause shaking, sweating, feeling hungry and sometimes even confusion if severe. You might need to take some sugar (e.g. orange juice or sweets) if this occurs as a more starchy food some as a sandwich to maintain your blood sugar. There is useful advice on the NHS website to prevent low blood sugar from happening.
Some people may get allergic reactions to metformin. Commonly these can just be mild rashes. Other times they can be significant and can be a serious allergic reaction: chest/throat tightness with difficulty breathing/wheezing and face/tongue/throat swelling (anaphylaxis); or a significant skin rash with blistering, itchy, peeling. If these serious reactions occur, you must call 999 or attend A&E immediately.
Should I Stop Metformin if I am Unwell?
If you are unwell with sickness or diarrhoea or you are struggling with hydration because of illness, it is important to stop taking metformin during this period. Taking metformin when dehydrated can cause a serious condition called lactic acidosis. You can restart 24 to 48 hours gain after recovery. If you are concerned or unwell, contact your doctor immediately, or ring 999 if very unwell.
Where Can I Find More Information?
The NHS website has answers for many common queries about pregnancy, surgery, contraception, alcohol and others. If you have any other specific questions related to metformin, you can ask your local pharmacist or ask for an appointment with your practice pharmacist if available.