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What is this pill, brown or tan. Maybe orange. Greek Sigma on one side and "4" on other?

Answers (1)

Plain Jane 10 Jun 2012

Pill imprint Logo 4 has been identified as Protriptyline hydrochloride 5 mg.
The logo is described as a Sigma and is made by Sigmapharm Laboratories, LLC
Protriptyline is used in the treatment of depression and belongs to the drug class tricyclic antidepressants.
https://www.drugs.com/imprints/logo-4-16166.html

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