A sulfonylurea for type 2 diabetes
Glimepiride
A once-daily sulfonylurea that lowers blood sugar in type 2 diabetes by prompting the pancreas to release more insulin; its main risk is low blood sugar (hypoglycaemia).
What is Glimepiride?
Glimepiride is a sulfonylurea tablet used to lower blood sugar in type 2 diabetes. It works by encouraging the pancreas to release more insulin, so it can lower blood sugar effectively but carries a risk of hypoglycaemia (low blood sugar), particularly if a meal is missed. It is usually taken once a day with or just before breakfast and is often added when metformin alone is not enough.
Education and reference only. This is a plain-language guide to Glimepiride — it deliberately contains no doses. Doses depend on the person, the brand and the reason for treatment, and belong with your prescriber. Always check the BNF, the product labelling (SmPC) and follow medical advice.
What it is
Glimepiride is a sulfonylurea used in the UK to lower blood sugar in type 2 diabetes. It is usually taken once a day and is often added to metformin, or used when metformin is not suitable. Unlike metformin and the newer SGLT2 inhibitors and GLP-1 medicines, sulfonylureas have not been shown to protect the heart or kidneys, so glimepiride is mainly chosen to bring blood sugar down rather than for any extra organ-protecting benefit. It works only while the pancreas is still able to make insulin, and its effect tends to wear off over the years as diabetes progresses.
How it works
Glimepiride stimulates the beta cells of the pancreas to release more insulin. Insulin is the hormone that moves sugar (glucose) out of the blood and into the body's cells for energy, so releasing more of it lowers blood sugar. Because it pushes the pancreas to release insulin whether or not you have eaten, blood sugar can fall too low if a meal is missed or delayed, which is why hypoglycaemia is the main risk.
Company & origin
Originated / developed by: Developed by Hoechst (now part of Sanofi)..
Glimepiride is a once-daily sulfonylurea developed in Germany and introduced in the 1990s for the treatment of type 2 diabetes.
What it treats
Conditions Glimepiride is used for
Practical use
How to take Glimepiride
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- Take it once a day with or just before your first main meal, usually breakfast, to match the medicine to your food.
- Do not skip meals while taking it, as missing food while the medicine is working can cause your blood sugar to fall too low.
- Always carry a fast-acting source of sugar (such as glucose tablets or a sugary drink) in case of a hypo, and follow it with a longer-acting snack.
- Be cautious with alcohol, which can make low blood sugar more likely and harder to recognise.
- If you are ill and eating less than usual, ask your diabetes team or pharmacist about adjusting the medicine.
- If you miss a dose, take it with your next meal rather than doubling up, and check with your pharmacist if unsure.
Weighing it up
Advantages & disadvantages of Glimepiride
Advantages
- It lowers blood sugar effectively and works quite quickly compared with some other tablets.
- It is taken only once a day, which is simple to fit into a routine.
- It is well established, inexpensive and often used as an add-on when metformin alone is not enough.
Disadvantages
- It can cause hypoglycaemia (low blood sugar), especially if meals are missed, in older people or with kidney problems.
- It tends to cause some weight gain.
- Unlike metformin, SGLT2 inhibitors and GLP-1 medicines, it has not been shown to protect the heart or kidneys, and its effect can fade over the years.
Practical use
Good to know
The most important thing to understand is the risk of hypoglycaemia (low blood sugar), which is more likely if you skip or delay a meal, eat less than usual, drink alcohol, are older, or have kidney problems. Learn the warning signs — shakiness, sweating, hunger, a fast heartbeat, confusion or irritability — and how to treat them quickly with a sugary drink or glucose, followed by a longer-acting snack. It is usually taken with or just before your first main meal of the day. It can cause some weight gain, which is worth bearing in mind. If you are unwell and not eating, ask your team about 'sick day' advice, as the medicine may need adjusting.
Who should not take it / use with caution
- People with type 1 diabetes or diabetic ketoacidosis, where insulin is needed instead.
- People with severe kidney or liver problems, in whom the risk of low blood sugar is higher (used with caution and review).
- Pregnant or breastfeeding women, and anyone who has had a serious allergic reaction to glimepiride or related sulfonylureas.
Monitoring
- Regular checks of blood sugar control, usually including an HbA1c blood test.
- Watching for episodes of low blood sugar and reviewing the dose if they occur.
- Reviewing kidney function and weight, and whether the medicine is still the best choice over time.
Side effects
- Low blood sugar (hypoglycaemia) — shakiness, sweating, hunger, confusion — which can be serious if not treated.
- Weight gain.
- Occasional digestive upset such as nausea.
- Rarely, allergic skin reactions or changes in liver blood tests.
Key interactions
- Alcohol can increase the risk of low blood sugar and should be used carefully.
- Other diabetes medicines, including insulin, add to the blood-sugar-lowering effect and raise hypo risk.
- Some medicines (such as certain antibiotics, antifungals and others) can change glimepiride levels or mask the signs of a hypo, so tell your prescriber about all your medicines.
Available as: Tablets taken by mouth.
Answers
Glimepiride: frequently asked questions
Why does glimepiride cause low blood sugar?
It works by prompting the pancreas to release more insulin, which lowers blood sugar whether or not you have eaten. If you miss or delay a meal, eat less than usual or drink alcohol, your blood sugar can drop too low, so it is important to eat regularly and know how to treat a hypo.
When should I take glimepiride?
It is usually taken once a day with or just before your first main meal, normally breakfast. Taking it with food helps match the medicine to your eating and reduces the risk of your blood sugar falling too low.
Will glimepiride make me put on weight?
Sulfonylureas like glimepiride can cause some weight gain, partly because of the extra insulin released. If this is a concern, discuss it with your diabetes team, as other diabetes medicines may have a more favourable effect on weight.
Does glimepiride protect my heart like some diabetes medicines?
No. Unlike metformin and the newer SGLT2 inhibitors and GLP-1 medicines, sulfonylureas have not been shown to protect the heart or kidneys. Glimepiride is chosen mainly to lower blood sugar rather than for any extra organ-protecting benefit.
What should I do if I am ill and not eating?
If you are unwell and eating less than usual, your blood sugar may drop, so ask your diabetes team or pharmacist about 'sick day' advice. The medicine may need adjusting, and you should keep checking for signs of low blood sugar.
The wider class
About Sulfonylureas
Glimepiride belongs to the sulfonylureas class. For how the class as a whole works, its shared safety principles and monitoring, see the full guide.
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Authoritative sources
- BNF
- NICE CKS
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