Common side effects can include low blood pressure (hypotension) and swelling in the legs (edema), among others. Some people experience headaches, although those typically improve over time. Others may experience additional hair growth on the face or body (hypertrichosis). This is the most common side effect of taking oral minoxidil, though the complaint is more common among women than men and is also more common when taking over 5 mg per day.
Side effects of oral minoxidil may be more pronounced when the drug is prescribed at higher doses.