Updated: January 25, 2026

What Is Glucophage XR? Uses, Dosage, and What You Need to Know in 2026

Q: What is Glucophage XR used for?

Glucophage XR (metformin extended-release) is FDA-approved for type 2 diabetes in adults as an adjunct to diet and exercise. It is also commonly prescribed off-label for polycystic ovary syndrome (PCOS), prediabetes, and off-label weight management support.

Q: What is the difference between Glucophage and Glucophage XR?

Glucophage is the immediate-release version of metformin, typically taken 2-3 times daily with meals. Glucophage XR is the extended-release version, taken once daily with the evening meal. Both contain the same active ingredient — metformin hydrochloride — and are equally effective. XR tends to cause fewer GI side effects for some patients. Both brand names have been discontinued; only generics are now available.

Q: How long does it take for Glucophage XR to start working?

Glucophage XR begins reducing blood sugar within the first few days of use. However, the full blood sugar-lowering effect — and meaningful HbA1c reduction — typically takes 1-3 months of consistent use at therapeutic doses. Your doctor will typically check your HbA1c after about 3 months to evaluate effectiveness.

Q: Can I take Glucophage XR at night?

Glucophage XR should be taken with the evening meal — not on an empty stomach and not at bedtime without food. Taking it with food improves absorption and reduces GI side effects. If you eat dinner late, take it with your dinner regardless of the time.

Q: Is Glucophage XR safe for long-term use?

Yes. Metformin extended-release has been used safely for decades and is considered one of the safest long-term diabetes medications. Long-term users should have kidney function monitored annually and Vitamin B12 levels checked every 2-3 years, as metformin can reduce B12 absorption over time.

Author

Peter Daggett

Summarize with AI

What Is Glucophage XR?
What Is Glucophage XR Used For?
Available Strengths and Forms
How Do You Take Glucophage XR?
Glucophage XR Dosing Guide
Is Glucophage XR a Controlled Substance?
How Much Does Glucophage XR Cost?
Finding Glucophage XR at a Pharmacy

New to Glucophage XR? Learn what it is, what it treats, how to take it, dosing information, and key facts about this extended-release diabetes medication.

If you've just been prescribed Glucophage XR — or you're researching it for a family member — this guide covers everything you need to know. From what the medication does to how to take it correctly, we'll break it all down in plain language.

What Is Glucophage XR?

Glucophage XR is the brand name for metformin hydrochloride extended-release tablets. It belongs to a class of drugs called biguanides. The "XR" stands for extended-release, meaning the medication is designed to be released slowly in your body over several hours, rather than all at once.

Important note: The original brand-name Glucophage XR was discontinued in the U.S. When your doctor prescribes Glucophage XR, you'll receive generic metformin hydrochloride extended-release — which is therapeutically equivalent to the original brand.

What Is Glucophage XR Used For?

Glucophage XR is FDA-approved for one indication:

Type 2 diabetes mellitus in adults: As an adjunct to diet and exercise to improve blood sugar control

It is also commonly prescribed off-label for:

Polycystic ovary syndrome (PCOS): Metformin is widely used to improve insulin resistance and regulate menstrual cycles in PCOS
Prediabetes / insulin resistance: Some doctors prescribe metformin to slow progression from prediabetes to type 2 diabetes
Weight management: Some healthcare providers prescribe metformin off-label to support weight loss, especially in patients with insulin resistance

Available Strengths and Forms

Glucophage XR (generic metformin ER) is available as extended-release tablets in the following strengths:

500 mg — most commonly prescribed starting dose
750 mg — available from some generic manufacturers
1000 mg — available from some generic manufacturers

How Do You Take Glucophage XR?

Here are the key rules for taking Glucophage XR correctly:

Take with the evening meal: Always take Glucophage XR with food — specifically with your main evening meal. This improves absorption and reduces GI side effects.
Swallow whole: Never crush, cut, or chew XR tablets. Doing so destroys the extended-release mechanism, releasing the entire dose at once.
Once daily: Glucophage XR is designed for once-daily dosing, unlike the immediate-release version which is taken 2-3 times daily.
Don't skip doses: Missed doses can cause blood sugar to rise. If you miss a dose, take it with your next meal — but don't double up.

Glucophage XR Dosing Guide

Starting dose: 500 mg once daily with the evening meal
Titration: Increase by 500 mg weekly based on blood sugar response and tolerability
Maximum dose: 2000 mg once daily with the evening meal; if adequate control not achieved, your doctor may try 1000 mg twice daily
Kidney function: Contraindicated if eGFR < 30 mL/min/1.73 m²; not recommended to start if eGFR 30-45

Is Glucophage XR a Controlled Substance?

No. Glucophage XR (metformin extended-release) is not a controlled substance. It has no abuse potential and does not require DEA registration to prescribe. It can be prescribed by any licensed healthcare provider, including primary care physicians, NPs, PAs, and telehealth providers.

How Much Does Glucophage XR Cost?

Generic metformin ER is one of the most affordable diabetes medications available:

Average retail: ~$48 for a 30-day supply
With GoodRx coupon: as low as ~$10-$11
With insurance: typically $0-$20 copay at Tier 1

Finding Glucophage XR at a Pharmacy

Generic metformin ER is widely available, but availability by specific strength can vary. Use medfinder to check which pharmacies near you have your specific strength in stock. For a complete side effects guide, see our article on Glucophage XR side effects.

Frequently Asked Questions

Glucophage XR (metformin extended-release) is FDA-approved for type 2 diabetes in adults as an adjunct to diet and exercise. It is also commonly prescribed off-label for polycystic ovary syndrome (PCOS), prediabetes, and off-label weight management support.

Glucophage is the immediate-release version of metformin, typically taken 2-3 times daily with meals. Glucophage XR is the extended-release version, taken once daily with the evening meal. Both contain the same active ingredient — metformin hydrochloride — and are equally effective. XR tends to cause fewer GI side effects for some patients. Both brand names have been discontinued; only generics are now available.

Glucophage XR begins reducing blood sugar within the first few days of use. However, the full blood sugar-lowering effect — and meaningful HbA1c reduction — typically takes 1-3 months of consistent use at therapeutic doses. Your doctor will typically check your HbA1c after about 3 months to evaluate effectiveness.

Glucophage XR should be taken with the evening meal — not on an empty stomach and not at bedtime without food. Taking it with food improves absorption and reduces GI side effects. If you eat dinner late, take it with your dinner regardless of the time.

Yes. Metformin extended-release has been used safely for decades and is considered one of the safest long-term diabetes medications. Long-term users should have kidney function monitored annually and Vitamin B12 levels checked every 2-3 years, as metformin can reduce B12 absorption over time.

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