What is a white round pill with wpi 839 on it

A round white pill with the imprint WPI 839 on the front is 150mg of Bupropion hydrochloride extended-release (made by Watson Pharmaceuticals).

Bupropion hydrochloride extended-release is a miscellaneous antidepressant that is used to treat depression, smoking cessation, ADHD, anxiety, and seasonal affective disorder, among other illnesses. There is a low risk of abuse with this drug.

This prescription-only medication may pose a risk to an unborn fetus, and should be used only under a doctor's supervision.

The Food and Drug Administration recently pulled the 300mg dose of bupropion, a generic form of Wellbutrin, off the market because they said it turned out NOT to be the bioequivalent to the brand name product.