Metformin can cause rare severe skin reactions.
September 2025 in “Clinical Case Reports” Oral minoxidil can cause dry mouth, but switching to topical minoxidil may prevent this side effect.
87 citations
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October 1997 in “JAMA” Some vaccines might rarely cause hair loss, more research is needed.
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.
6 citations
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September 1988 in “Drug intelligence & clinical pharmacy” Minoxidil caused a severe rash in a patient, which improved after stopping the drug.
