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Telehealth companies like Hims & Hers (HIMS) are aggressively marketing hair-loss medications to young men, with some patients saying they had serious side effects and didn't realize they were possible, The Wall Street Journal's Rolfe Winkler reports.

Finasteride, the generic name for Propecia, is widely prescribed but has been linked to serious side effects in some men, including persistent sexual problems and suicidal thoughts, though telehealth companies say they disclose side effects and other risks on their websites and say clinical studies show finasteride is effective and side effects are rare.

Organon (OGN), a spinout of Merck (MRK), makes the branded-version of the drug. Other companies in the telehealth space include Teladoc (TDOC) and Amwell (AMWL).