Metformin can cause rare severe skin reactions.
January 2009 in “Reactions Weekly” A man had an allergic skin reaction on his penis from a hair loss medication, which improved after stopping the medication.
April 2003 in “Reactions Weekly” A woman developed skin irritation from treatments for hair loss, showing allergies to both minoxidil and saw palmetto solutions.
January 2026 in “Frontiers in Pharmacology” Certain drugs can cause male infertility, so fertility counseling and sperm preservation are advised.
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July 1988 in “JAMA” Metronidazole can cause lung disease.
