Minoxidil is a vasodilator and originally was exclusively used as an oral drug (Loniten®) to treat high blood pressure. It was, however, discovered to have the interesting side effect of hair growth and reversing baldness, and in the 1980s, UpJohn Corporation produced a topical solution that contained 2% minoxidil to be used to treat baldness and hair loss, under the brand name Rogaine. It is unknown how the drug stimulates hair growth.

Side effects

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As a drug to combat hair loss, the most common side effect is itchy scalp.

There have been cases of allergic reactions to minoxidil or the non-active ingredient propylene glycol which is found in some forms of the topical version, such as Regaine. Large amounts of minoxidil can cause hypotension, and it has been found that using petroleum jelly or tretinoin on the scalp with minoxidil can cause too much of the drug absorption by the scalp, as can using the drug on sunburned scalps.

More on [ Minoxidil ]

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