Scary Side Effects of Hair Loss MedicationWe all know the commercials for male pattern baldness. Nobody ever has to be bald again with these pills! Except, it's not always that simple. Finasteride, the active ingredient in Propecia (for hair loss) and Proscar (for enlarged prostate), carries some very serious side effects. Cue the voice-over speaking as quickly as possible, "Side effects may include..."
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"If you experience any of these symptoms, call your doctor immediately:" rash, itching or hives. Though it may not seem like a big deal, this could indicate an allergic reaction to the medication, which can increase in severity very quickly. Call your doctor immediately.