Hi, Minoxidil is a medication used to treat hair loss, but like any medication, it can have side effects. Some common side effects of using minoxidil include: * Scalp irritation: Minoxidil can cause itching, dryness, and redness of the scalp. * Increased hair loss: When you start using minoxidil, it s common to experience an increase in hair loss for the first few weeks. This is because the medication stimulates hair follicles to enter the growth phase, which can cause the shedding of older hairs. * Dizziness and lightheadedness: Some people may experience dizziness and lightheadedness after applying minoxidil. * Chest pain and rapid heartbeat: In rare cases, minoxidil can cause chest pain, rapid heartbeat, and other cardiovascular side effects. * Headache: Some people may experience headaches after using minoxidil. * Unwanted hair growth: Minoxidil can sometimes cause unwanted hair growth in other areas of the body, such as the face. It s important to talk to your doctor before using minoxidil, especially if you have any preexisting medical conditions or are taking other medications. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Priyanka, General & Family Physician