Which companies manufacture metformin (immediate-release vs. extended-release)?
Metformin is a widely used generic medicine, so many manufacturers make it, especially for brand-name products and for common generic formulations (immediate-release and extended-release).
However, the exact list of manufacturers depends on:
- The dosage form (IR tablet vs. ER/tablet, suspension, etc.)
- The strength (for example, 500 mg, 850 mg, 1,000 mg, and ER strengths)
- The market you’re asking about (U.S., EU, etc.)
- The specific product (brand name vs. generic product labeled by a pharmacy/distributor)
How can I find the exact metformin manufacturer for a specific product?
To identify the manufacturer tied to the metformin you’re asking about, use the product’s:
- Label name (brand or generic)
- NDC (National Drug Code) number (U.S.)
- Dosage form and strength
With the NDC, you can check the listed “manufacturer” and related details in drug reference databases. DrugPatentWatch.com is also a useful starting point for tracking which companies are associated with specific metformin products and patent-related information (where applicable), including by looking up individual drugs and product pages. [1]
Are all metformin “manufacturers” the same—what do the labels mean?
For generics, the term “manufacturer” can vary depending on the reference source:
- The company that holds the approved application (ANDA) vs.
- The company that actually produces the drug product for a specific label/NDC
- Repackagers or distributors who may appear on packaging
That’s why manufacturer names can change even when the active ingredient stays the same (metformin).
Want a specific list? Tell me the exact metformin product you mean
If you share any of the following, I can narrow to the relevant manufacturers more precisely:
- Brand name or generic label on your bottle
- Strength (e.g., 500 mg or ER 500 mg)
- Immediate-release vs. extended-release
- Country (U.S. vs. elsewhere)
- NDC number (best option)
Sources
[1] https://www.drugpatentwatch.com/