Many people turn to minoxidil for hair growth, and while it can be effective, it comes with downsides. Minoxidil stains pillowcases and clothing, and it's toxic to pets—especially cats and dogs who might come into contact with your hair or pillowcase. It also requires consistent, long-term use, and if you stop, the benefits typically reverse. If you choose to use it, consult with a dermatologist first.