Side Effects of minoxidil
Along with its needed effects, minoxidil may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor as soon as possible if any of the following side effects occur:

• Rare
  • Acne at site of application;  burning of scalp;  increased hair loss;  inflammation or soreness at root of hair;  reddened skin;  swelling of face 

• Signs and symptoms of too much medicine being absorbed into the body—Rare
  • Blurred vision or other changes in vision;  chest pain;  decrease of sexual ability or desire ;  fast or irregular heartbeat;  flushing;  headache;  lightheadedness ;  numbness or tingling of hands, feet, or face;  swelling of face, hands, feet, or lower legs;  weight gain (rapid) 

Other side effects not listed above may also occur in some patients. If you notice any other effects, stop using minoxidil and check with your doctor.