In my paper, I have used a drug name called Metformin. But I received a comment from Editor to cite the drug name.

May I know how can I cite the drug name in AMA style?

There could be multiple suppliers/companies that produce/manufactures this drug from a different location

Can help me with this?

1 Answer 1


Usually you cite drug package inserts.

See Chapter 3.13.6 of the AMA Manual of Style (11th ed.):

Package inserts, patient information, and prescribing information (the material about the use and effects of the product) may be cited as follows:

  1. Zithromax. Prescribing information. Pfizer; 2017. Accessed June 23, 2019. https://www.pfizermedicalinformation.com/en-us/zithromax
  2. Azilect. Package insert. Teva Pharmaceuticals Inc; 2014.

The general pattern, as I see it, would be: Drug. Type-of-document. Manufacturer. Date. Optional-internet-access-date. Optional-internet-source..

If there are multiple manufacturers for one drug, you could cite all of them (as long as that seems appropriate for the specific context within your publication).

  • Thanks for your help. Upvoted...My question is there could be multiple suppliers of a drug. Am I right? Should we use manufacturer name? In your example above, Teva Pharmaceuticals in Manufacturer name?
    – The Great
    Jan 15, 2021 at 11:47
  • For ex: Metformin may have multiple manufacturers. Should we just pick some random one?
    – The Great
    Jan 15, 2021 at 11:53
  • I edited the post to add more information on multiple manufacturers. I would cite each manufacturer (as long as it seems relevant to your paper).
    – anpami
    Jan 15, 2021 at 11:54
  • Sorry, am new to this. Your answer is for Bibliography citation? May I know how can we do it for in-text citation?
    – The Great
    Jan 15, 2021 at 11:59
  • 1
    @The Great Did you capitalize metformin in the middle of a sentence? In the middle of a sentence, the term will seem to be a brand name. Uncapitalized, metformin is the generic term for the chemical moiety--N,N-dimethylbiguanide. As noted, there are many manufacturers of metformin and many brand names for this chemical entity. Unless your paper is about a specific brand of metformin, you should write--metformin (uncapitalized except as first word in a sentence) and give the chemical formula in parentheses. "This study involved the drug metformin (generic term for N,N-dimethylbiguanide)" Jan 16, 2021 at 20:00

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