Glimepiride

Key facts

• Glimepiride is a sulfonylurea. It prompts the pancreas to release more insulin, which lowers blood sugar in type 2 diabetes.
• You take it once daily, usually with breakfast or the first main meal of the day, and its effect starts within an hour and lasts through the day.
• Hypoglycemia (low blood sugar) is glimepiride's defining risk. Never skip, delay, or shrink a meal after taking a dose, and always carry a fast-acting sugar source in case of shakiness, sweating, or confusion.
• Seek urgent care for confusion, slurred speech, seizures, or loss of consciousness from low blood sugar that doesn't respond to sugar or improve quickly.

What glimepiride treats

Glimepiride lowers elevated blood sugar in adults with type 2 diabetes when diet and exercise alone aren't enough. It's often used together with metformin or other diabetes medicines, and is sometimes chosen when an oral option is preferred before moving to injectable therapy. It does not treat type 1 diabetes, where sulfonylureas don't work because the pancreas makes no insulin.

How glimepiride works

Glimepiride acts on the pancreas's beta cells, closing a potassium channel that triggers insulin release. More insulin reaching the bloodstream helps cells take up glucose, lowering blood sugar. Because this happens whether or not you've just eaten, the insulin release isn't automatically matched to your food intake, which is why skipping a meal after a dose is risky.

Before you take it

• Avoid glimepiride if you're allergic to sulfonylureas, or if you have type 1 diabetes or diabetic ketoacidosis.
• Use it with caution if you have significant liver or kidney disease, both of which slow its clearance and raise the risk of prolonged low blood sugar.
• Tell your prescriber before drinking alcohol, since it can intensify and prolong hypoglycemia.
• Avoid glimepiride in pregnancy and while breastfeeding unless your prescriber decides the benefit outweighs the risk.

Side effects

Common effects include mild dizziness, nausea, headache, weight gain, and occasional skin rash or itching.

Stop and seek urgent medical care for any of these:

• Shakiness, sweating, confusion, or fainting from low blood sugar.
• Swelling of the face, lips, or throat, or difficulty breathing.
• Persistent vomiting or diarrhea leading to dehydration.
• Yellowing of the skin or eyes, or unusually dark urine.

Safety essentials

• Never skip a meal after taking glimepiride, and eat on a regular schedule; irregular eating is the most common cause of dangerous lows.
• Learn the early signs of hypoglycemia, shakiness, sweating, hunger, confusion, and treat them immediately with a fast-acting sugar, then a snack.
• Older adults and people with kidney or liver problems are more prone to prolonged lows, and their doses are usually kept low and adjusted cautiously.

This page is educational and does not replace advice from a doctor or pharmacist who knows your health history.