Symptoms of dystonia , prolonged abnormal contractions of muscle groups, may occur in susceptible individuals during the first few days of treatment. Dystonic symptoms include: spasm of the neck muscles, sometimes progressing to tightness of the throat, swallowing difficulty, difficulty breathing, and/or protrusion of the tongue. While these symptoms can occur at low doses, they occur more frequently and with greater severity with high potency and at higher doses of first generation antipsychotic drugs. An elevated risk of acute dystonia is observed in males and younger age groups.
But not every side effect is a bad one. Some are downright welcome. Take finasteride . Introduced in 1992 to treat noncancerous enlargement of the prostate gland , it was found to regrow hair (and is marketed for that purpose under the name Propecia). Today, millions of men use a low dose of finasteride to treat male pattern baldness . Similarly, minoxidil , originally marketed as an oral tablet for high blood pressure , was found to grow hair in those using it. Today, as a topical lotion or foam, it is a popular over-the-counter remedy for baldness.