Dizziness or lightheadedness may occur as your body adjusts to the medication. If either of these effects persists or worsens, tell your doctor or pharmacist promptly.
Minoxidil may cause increased growth or darkening of fine body hairs. If this bothers you, consult your doctor. When you stop taking the medication, the hair will usually return to normal within 1 to 6 months.
Tell your doctor right away if you have any serious side effects, including: fast heartbeat, symptoms of heart failure (such as shortness of breath, swelling ankles/feet, unusual tiredness, unusual/sudden weight gain), fainting.
Get medical help right away if you have any very serious side effects, including: chest/jaw/left arm pain.
A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.