research Relationship Between Serum Concentrations, Hemodynamic Effects, and Cardiovascular Lesions in Dogs Treated with Minoxidil 29 citations, October 1996 in “Toxicology and Applied Pharmacology” Higher minoxidil doses in dogs cause faster heart rate, lower blood pressure, and heart issues.
research Minoxidil: Right Atrial Cardiac Pathology in Animals and Humans 35 citations, August 1980 in “Circulation” Minoxidil may cause heart issues in animals and humans.
community So is sublingual topical minoxidil not as effective as oral? in Minoxidil 8 upvotes 3 years ago Topical liquid minoxidil may be safe to consume in small amounts, but it needs liver processing to become effective for hair growth. Therefore, oral pills might be more effective.