If you stop taking glipizide, your blood sugar will likely rise, and because the immediate-release form usually leaves the body within hours, that can start soon after missed doses. Glipizide isn’t generally known to cause a withdrawal syndrome, but high blood sugar can cause symptoms right away and, if it stays high, can raise your long-term risk of diabetes complications. If you’re thinking about stopping, have run out, or are having side effects, this guide explains what to expect and why the decision should be made with your prescriber.
Key takeaways
- In a major long-term study of people with type 2 diabetes, each 1% reduction in average blood sugar (A1C) was linked to a 37% lower risk of eye, kidney, and nerve complications.
- Glipizide’s label gives no tapering schedule, but stopping or lowering it is a medical decision based on your blood sugar, other medicines, and health.
- If you’ve run out or want to stop, check your blood sugar and contact your prescriber or a refill service as soon as possible.
What happens when you stop taking glipizide?
Your blood sugar usually goes up. Glipizide is a sulfonylurea, a type of medicine that lowers blood sugar by prompting the pancreas to release more insulin, so when you stop taking it, that extra insulin release stops too.
How fast this happens depends on the form you take. The glipizide tablet label lists an elimination half-life (the time it takes the body to clear half the drug) of 2 to 4 hours for immediate-release tablets, and the drug doesn’t build up with repeated doses. The Glucotrol XL (extended-release glipizide) label describes an extended-release form taken once a day. With either form, the blood-sugar-lowering effect can fade within a day or so of a missed dose.
How high your blood sugar climbs depends on your diet, activity, other diabetes medicines, and how much your body still relies on glipizide. Some people notice symptoms quickly, while others may feel fine even as their numbers rise.
Signs your blood sugar is too high
High blood sugar (hyperglycemia) often develops gradually, so it helps to know what to watch for. MedlinePlus lists these common signs:
- Increased thirst or a dry mouth, often one of the first changes people notice.
- Frequent urination, including getting up more often at night.
- Blurry vision, which can come and go as blood sugar changes.
- Feeling weak or tired, even without extra activity.
- Dry skin, along with a higher chance of infections when blood sugar stays high.
If you’ve stopped glipizide or missed several doses, checking your blood sugar at home is the most reliable way to know what’s happening. The next question is how serious a rise can become.
Can stopping glipizide be dangerous?
It can be, both in the short term and over time. Stopping glipizide doesn’t usually cause an emergency on its own, but very high blood sugar can.
In the short term, a dangerous complication called hyperglycemic hyperosmolar syndrome (HHS) can develop in people with type 2 diabetes. HHS causes extremely high blood sugar and severe dehydration, and MedlinePlus lists running out of or not taking prescribed diabetes medicines among its triggers. Symptoms such as increased thirst and urination can progress over days or weeks to weakness, confusion, seizures, or coma, and HHS is a medical emergency.
Over the long term, higher blood sugar can raise the risk of diabetes complications. A UK Prospective Diabetes Study followed 4,585 people with type 2 diabetes. Each 1% reduction in A1C was associated with a 21% lower risk of any diabetes-related complication and a 37% lower risk of complications affecting the eyes, kidneys, and nerves. The National Institute of Diabetes and Digestive and Kidney Diseases notes that diabetes can damage blood vessels and lead to heart disease, stroke, kidney disease, and vision loss. Not taking diabetes medicines consistently is also linked to poor health outcomes. In a study of 11,532 people with diabetes, those who had their diabetes, blood pressure, or cholesterol medicines on hand less than 80% of the time had 58% higher odds of hospitalization and 81% higher odds of death after accounting for other factors.
Staying on a working treatment plan is how most people avoid these problems, which is why stopping should be planned rather than sudden.
Is there glipizide withdrawal?
Glipizide isn’t generally known to cause withdrawal symptoms the way some medicines do. The glipizide label doesn’t describe a withdrawal syndrome or give a tapering schedule, and it states that continuing or stopping glipizide should be based on clinical judgment.
The symptoms people notice after stopping usually come from rising blood sugar rather than from the drug leaving the body. That’s an important difference, because the fix is getting blood sugar back under control, which may mean restarting glipizide or switching to another medicine your prescriber chooses.
MedlinePlus advises continuing glipizide even if you feel well and not stopping it without talking to your doctor.
When might a provider stop or lower glipizide?
Stopping glipizide can sometimes be an appropriate choice, but it should be your prescriber’s decision. A provider may lower or stop it for reasons like these:
- Frequent low blood sugar. The label notes that low blood sugar is more likely with skipped meals, intense exercise, alcohol, kidney or liver problems, or other glucose-lowering medicines.
- Older age or complex health problems. In a national study of 1,288 adults aged 65 and older, 61.5% had tight blood sugar control, and more than half of those were taking insulin or a sulfonylurea. However, the authors suggested that many may have been overtreated.
- Illness, injury, or surgery. The label says stress such as fever, infection, trauma, or surgery can cause a loss of blood sugar control, and a provider may temporarily stop glipizide and use insulin.
- Reduced effectiveness over time. Glipizide may control blood sugar less well after a period of use, which the label calls secondary failure.
- A switch to another medicine. Your prescriber may move you to a different treatment that better fits your needs.
If any of these apply, ask your prescriber whether your plan should change instead of adjusting it yourself. The guide to what happens if you stop taking metformin covers similar questions for another common diabetes medicine.
What to do if you’ve missed doses or run out
If you’ve run out of glipizide or missed several doses, a few steps can help you avoid a long gap:
- Don’t double up. MedlinePlus advises taking a missed dose when you remember unless it’s almost time for the next one, and never taking a double dose.
- Check your blood sugar. Test more often until you’re back on your medicine, and note any readings above your target.
- Contact your prescriber or pharmacy. Ask about an early refill or a short supply. The guide to how early you can refill a prescription explains common pharmacy timing rules.
- Watch for warning signs. Seek care right away for confusion, extreme thirst, or signs of dehydration.
If you’re stable on glipizide and can’t reach your regular provider before you run out, a board-certified physician can review your refill request without an appointment and, if appropriate, send it to your pharmacy, typically within a few hours. The diabetes refill page explains how online refills work for diabetes medicines. A refill service continues your current medicine and dose. It doesn’t stop, switch, or change your diabetes treatment, so if your blood sugar has been running high or low, a virtual primary care visit is the better route.
When to seek medical attention
Contact your provider if your blood sugar stays above your target for more than a few days without a clear reason, or if you have frequent low readings. MedlinePlus advises people with type 2 diabetes to check for ketones if blood sugar is above goal for more than 3 days without a known reason.
Get emergency care for confusion, extreme thirst with signs of dehydration, weakness, seizures, or trouble staying awake. This is not an emergency service. In an emergency, call 911 or go to the nearest emergency room.
Frequently asked questions
How long does glipizide stay in your system?
Immediate-release glipizide has a half-life of 2 to 4 hours, and the label says it doesn’t build up with repeated doses. Extended-release glipizide is designed to work over a full day. Its blood-sugar-lowering effect fades relatively quickly after you stop.
Can you stop glipizide cold turkey?
Glipizide isn’t known to cause withdrawal, but stopping suddenly can let your blood sugar rise. Talk with your prescriber before stopping so you have a plan to keep your blood sugar in range.
Will blood sugar go up if you stop glipizide?
In most people, yes. How much it rises depends on your diet, activity, other medicines, and how much your body relies on glipizide. Checking your blood sugar is the best way to know.
Can diet and exercise replace glipizide?
For some people, lifestyle changes improve blood sugar enough that a provider can lower or stop a medicine. That decision should be based on your A1C, which the CDC explains measures your average blood sugar over the past 3 months, along with your other health factors.
What should you do if glipizide is causing low blood sugar?
Treat the low right away and contact your prescriber, who may lower your dose or change your medicine. The CDC’s 15-15 rule is to have 15 grams of fast-acting carbohydrate, wait 15 minutes, and recheck. Don’t stop glipizide on your own without a plan.
Get your prescription refill
If you’re stable on glipizide and can’t reach your regular provider before you run out, My Med Refills can help you avoid a gap. A board-certified physician will review your request, typically within a few hours, and send an approved prescription to your pharmacy. Get your prescription refill; current pricing is shown on the booking page.
Sources
- U.S. National Library of Medicine, DailyMed. Revised May 2017. Glipizide tablets (Apotex Corp.): prescribing information. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=dcf426b8-bcdc-8214-a1b6-6388bd3399a0
- U.S. National Library of Medicine, DailyMed. Revised August 2023. Glucotrol XL (glipizide) extended-release tablets: prescribing information. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=eed99b60-d043-4249-9b2a-f05e46fb588d
- MedlinePlus. Revised October 15, 2017. Glipizide. https://medlineplus.gov/druginfo/meds/a684060.html
- MedlinePlus. Reviewed January 25, 2026. High blood sugar: self-care. https://medlineplus.gov/ency/patientinstructions/000332.htm
- MedlinePlus. Reviewed January 25, 2026. Diabetic hyperglycemic hyperosmolar syndrome. https://medlineplus.gov/ency/article/000304.htm
- Stratton IM, Adler AI, Neil HAW, et al. Association of glycaemia with macrovascular and microvascular complications of type 2 diabetes (UKPDS 35): prospective observational study. BMJ. 2000;321(7258):405-412. doi:10.1136/bmj.321.7258.405. https://www.bmj.com/content/321/7258/405
- Lipska KJ, Ross JS, Miao Y, et al. Potential overtreatment of diabetes mellitus in older adults with tight glycemic control. JAMA Intern Med. 2015;175(3):356-362. doi:10.1001/jamainternmed.2014.7345. https://pubmed.ncbi.nlm.nih.gov/25581565/
- National Institute of Diabetes and Digestive and Kidney Diseases. Last reviewed December 2016. Preventing Diabetes Problems. https://www.niddk.nih.gov/health-information/diabetes/overview/preventing-problems
- Centers for Disease Control and Prevention. Published May 15, 2024. A1C Test for Diabetes and Prediabetes. https://www.cdc.gov/diabetes/diabetes-testing/prediabetes-a1c-test.html
- Centers for Disease Control and Prevention. Published May 15, 2024. Treatment of Low Blood Sugar (Hypoglycemia). https://www.cdc.gov/diabetes/treatment/treatment-low-blood-sugar-hypoglycemia.html
- Ho PM, Rumsfeld JS, Masoudi FA, et al. Effect of medication nonadherence on hospitalization and mortality among patients with diabetes mellitus. Arch Intern Med. 2006;166(17):1836-1841. doi:10.1001/archinte.166.17.1836. https://pubmed.ncbi.nlm.nih.gov/17000939/
This article is for informational purposes only and is not a substitute for professional medical advice.
This is not an emergency service. In an emergency, call 911 or go to the nearest emergency room.