What is pennsaid topical solution used for?

Pennsaid (pennsaid topical solution) is used to treat pain caused by osteoarthritis in specific joints—most commonly pain in the knee and the hand. [1]

Patients typically use it as a topical anti-inflammatory/pain-relief medicine so they can target joint discomfort at the skin level rather than taking an oral pain medicine. [1]

Sources:
1. https://www.drugs.com/pennsaid.html