Rogaine is a brand name for the drug minoxidil, which is used to treat hair loss. Minoxidil was initially developed as an oral medication to treat high blood pressure, but researchers noticed that one of its side effects was increased hair growth. This led to the development of topical minoxidil formulations like Rogaine.

Rogaine is available over-the-counter and can be applied directly to the scalp. It is approved by the US Food and Drug Administration (FDA) for the treatment of androgenetic alopecia, also known as male or female pattern baldness. It is believed to work by widening blood vessels in the scalp, which increases blood flow and delivers more nutrients and oxygen to hair follicles. This can stimulate hair growth and prolong the growth phase of hair.

While Rogaine has been shown to be effective for some people, it may not work for everyone. It is important to use the product as directed and to be patient, as it can take several months to see results. It is also important to note that once treatment is stopped, any new hair growth will typically fall out within a few months. Rogaine may also cause side effects, including scalp irritation, itching, and dryness.