Minoxidil is prescribed in oral form to treat high blood pressure (hypertension), and is also the active ingredient in liquid and foam hair re-growth formulas. Minoxidil relaxes the blood vessels, allowing the blood to flow more easily. It is important that the patient recognize that use of minoxidil liquid made from crushing tablets can be dangerous, as the chemical can cause unwanted effects on the blood vessels and heart when not taken as prescribed.
Common Side Effects
When taken orally for hypertension, a common side effect is an increase in hair growth on the arms, back and face. Let your doctor know if your body hair growth increases. According to the Mayo Clinic, you should contact your doctor immediately if you experience rapid weight gain (over 5 lbs. in adults or over 2 lbs. in children) or if you develop an irregular or fast heartbeat. If used topically, the manufacturers of Rogaine state you should stop use immediately and contact your doctor if you experience any of the same side effects, as well as chest pain, faintness, dizziness, swelling in the hands and feet, or redness or irritation on your scalp.
Less Common Side Effects
Let your doctor know if you experience tingling or numbness in the face, feet or hands, or if you have shortness of breath or chest pain. Both men and women have experienced breast tenderness and headaches while taking minoxidil; there is no need to contact your physician if you experience these side effects.
Rare Side Effects
On rare occasions, patients have developed itching and skin rashes from using minoxidil. If you have this side effect, let your doctor know at your next visit (unless it becomes a nuisance).
Precautions
The Mayo Clinic recommends that you take your pulse daily and contact your physician if it increases more than 20 beats per minute while you are at rest. In addition, monitor your weight regularly. Check with your doctor before taking any over-the-counter medications such as those used for coughs, asthma, appetite control, colds, sinus problems or hay fever. Topical minoxidil should not be used by women who are breastfeeding or pregnant, or may become pregnant.
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