Side effects of Rogaine for men include skin rashes and continual itchy scalp, according to Drugs.com. Minoxidil topical is the active ingredient in Rogaine, and most patients tolerate it well. Unwanted facial hair may develop while using Rogaine, but it typically disappears when patients stop using the product, notes Rogaine.
Other rare side effects include facial swelling, reddened skin, vision changes, rapid heart beat and chest pain, notes Drugs.com. Rogaine stimulates hair follicles to move from the resting phase to the growing phase. During the first two weeks of Rogaine treatment, many patients experience temporary increases in hair shedding, explains Rogaine. As of June 2015, there are no known drug interactions between Rogaine and oral medications.