research Unilateral Gynecomastia Induced by Treatment With 1 mg of Oral Finasteride 30 citations, March 2001 in “Archives of Dermatology” Finasteride can cause one-sided breast enlargement, which disappears after stopping the drug.
research Cardiovascular Toxicity of Minoxidil in the Marmoset 15 citations, August 2008 in “Toxicology Letters” High doses of minoxidil can harm marmoset hearts and kidneys, possibly affecting humans similarly.