Minoxidil solution and foam are used to treat male pattern baldness in an effort to promote hair growth. It is not used to cure male frontal baldness or receding hairlines. Women with thinning hair should use the foam together with a 2 percent minoxidil solution to promote hair growth. Vasodilators are a class of medications that How Should Women Use Minoxidil. How minoxidil promotes hair growth is unknown. This medicine does not address hair loss that occurs after childbirth, hair loss that is sudden or uneven, or hair loss that has no apparent reason (such as when there is no family history of the condition). If you are under the age of 18, do not use this product.