Please, dont listen to people saying rogaine foam or liquid destroyed their hair. There is no scientific evidence for that, and there have been numerous studies in hundreds of patients, and each study lasted 3years+. I have seen MANY success stories with pictures from minoxidil, and i have heard many stories about minoxidil destroying hair, but NOT A SIGNE ONE has pictures to prove it.
As far as medical sides, they are very rare, not very important, and they subside once you stop the drug. The worst thing you can get is some chest pain or a high pulse.