These drugs can cause hair loss but not very commonly. The vast vast majority of patients who take these drugs do not develop shedding or hair loss. If you think you have hair loss from a medication, be sure to see a dermatologist specializing in hair loss. A full medical history, a careful examination of the scalp and blood tests are all essential. A biopsy is usually not necessary and seldom helps.Hair loss can be dose dependent for some individuals but certainly not all. For many patients, it's an all or none type phenomenon.Medication related hair shedding is among the most challenging types of hair loss to diagnose. Hair loss from medications usually happens 4-10 weeks after starting a drug.Switching between similat drugs even within the same class can sometimes be helpful. So even if one type of antidepressant causes hair loss another might not.All in all, anyone who thinks a drug might be causing hair loss should see a dermatologist for careful evaluation.