Medication
Can I switch between regular and extended-release metformin?
Check the medicine name, strength and release type, then ask a clinician or pharmacist about switching. Tablets with the same strength can have different formulations.
Why does the formulation matter if the drug name is the same?
A patient guide from Beijing Tsinghua Changgung Hospital explains that regular and modified-release formulations can release medicine differently in the digestive tract. Check the full generic name and formulation on the box as well as the strength. Bring photos of the original packaging and prescription so the pharmacist can compare them. Hospital guide to oral formulations
What should I show a pharmacist if the box says ER or XR?
One US metformin hydrochloride label in DailyMed identifies the tablets as extended-release and instructs patients to swallow them whole. If you are offered a different product in China, ask the pharmacist to check the instructions for that exact product. DailyMed product label
| What the original prescription or box says | What to check |
|---|---|
| Regular tablet, or simply metformin | Show the box, tablet strength and current prescription and ask which formulation it is |
| ER, XR or extended-release | Keep the full original name and compare the release type and product instructions |
What if the pharmacy in China has a different formulation?
The Beijing hospital guide explains that the formulation and whether it remains intact can affect drug release. Tell the care team how much medicine you have left and show them the box and prescription. Ask whether a new prescription is needed and record the instructions the clinician gives you on your medication list. Tell the pharmacist if you have difficulty swallowing. Hospital guide
Frequently asked questions
Can I split an extended-release metformin tablet if it has a score line?
Ask a pharmacist to check the instructions for that product. The appearance of the tablet alone cannot tell you whether it can be split.
Need help?
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