King, Charles, III, Alvin J. Silk, Ernst R. Berndt, and Lisa R. Klein. "Pepcid AC: Racing to the OTC Market." Harvard Business School Case 500-073, February 2000 ...

The human medicine, which can be used in animals, is available in oral tablets, a liquid, and an injection. Famotidine tablets are available over-the-counter (OTC) without a prescription.

Throw away any unused famotidine that is older than 30 days. liquid Call your doctor if the condition you are treating with famotidine does not improve, or if it gets worse while using famotidine.