Along with its needed effects, minoxidil topical (the active ingredient contained in Rogaine) may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention. Check with your doctor as soon as possible if any of the following side effects occur while taking minoxidil topical:

Topical minoxidil is generally well tolerated, but it can cause temporary hair shedding, scalp irritation, and changes in hair texture. In rare cases, it can contribute to a fast heartbeat. Some minoxidil side effects can be avoided by taking the low-dose tablet formulation.

Check with your doctor as soon as possible if any of the following side effects occur while taking minoxidil: Some side effects of minoxidil may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine.

Rogaine typically does not cause permanent side effects. Most side effects, such as scalp irritation, are reversible and usually resolve after discontinuing the treatment. However, it is important to consult a healthcare professional for any persistent or severe symptoms.

Common minoxidil side effects may include changes in the color or texture of your hair. Get emergency medical help if you have any of these signs of an allergic reaction: hives, difficulty breathing, swelling of your face, lips, tongue, or throat.