Taking minoxidil and finasteride has certain risks. The most common side effect is local scalp irritation. This is potentially caused by the propylene glycol base, which the minoxidil and finasteride are dissolved in. Additionally, shedding of hair is common in the first two to eight weeks of treatment. This is likely due to hair follicles releasing hair that is no longer growing in order to start up new growth. Additionally, the topical minoxidil and finasteride solution may cause facial hypertrichosis or the growth of excessive hair on the face. This normally resolves within 4 months of ceasing treatment. Facial hypertrichosis can be managed in a number of ways, including using a razor, waxing, nair, laser hair removal or threading. Some women may also experience headaches, metallic taste in mouth, metallic taste in mouth, breathlessness, palpitations and tachycardia when taking this medication.
Review important safety information.