Can minoxidil be dangerous for some?

Yes, minoxidil has known side effects, and one of them is dangerous. It is called Pericardial Effusion, which means fluid builds up inside the heart sac. As the fluid builds up, blood is restricted from entering the heart. This produces significant swelling of the legs and feet, shortness of breath, and easy fatigue, and if it goes untreated, it could kill you. If you note swelling of your face, hands or feet, notify your doctor and consider stopping the minoxidil.  It is also a hypotensive agent, and some men can’t tolerate it because of fast heartbeats and repeated bouts of headedness.