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Minoxidil is a medicine available as prescription oral tablets and over-the-counter topical hair regrowth treatments. Oral minoxidil is a potent vasodilator approved for severe hypertension that has not responded adequately to multiple blood pressure medicines. Topical minoxidil products are approved for certain patterns of hereditary scalp hair loss in adults. Oral minoxidil prescribed for hair growth is an off-label use.
read more about minoxidil ...Minoxidil relaxes small arteries by acting on potassium channels in vascular smooth muscle, reducing peripheral vascular resistance and blood pressure. Topical minoxidil can stimulate hair follicles and prolong the growth phase of the hair cycle. Its precise mechanism for promoting hair regrowth is not fully established.
Oral minoxidil is reserved for patients with severe hypertension who have not responded adequately to a diuretic and two other blood pressure medicines. Topical formulations treat certain patterns of gradual hereditary hair thinning in adults. Different products are labeled for men or women, and their directions are not interchangeable. Sudden or patchy hair loss requires medical assessment before treatment.
For severe hypertension, the recommended starting oral dose in patients older than 12 is 5 mg once daily. The usual effective range is 10 mg to 40 mg daily, with a maximum of 100 mg under close medical supervision. Men's 5 percent topical solution is generally applied at 1 mL twice daily. Women's 5 percent topical foam is applied at half a capful once daily. Oral and topical doses must not be substituted for one another.
Oral minoxidil carries a boxed warning for serious cardiovascular effects, including fluid accumulation around the heart that can progress to cardiac tamponade and worsening angina. It can cause rapid heartbeat, fluid retention, and swelling, so treatment usually includes a diuretic and a beta blocker. Topical products can cause scalp irritation or unwanted hair growth. Chest pain, rapid heartbeat, faintness, or sudden swelling during topical treatment requires medical evaluation.
Prescription oral minoxidil treats selected severe hypertension, while topical minoxidil products treat certain types of hereditary scalp hair loss.
No. Oral minoxidil is approved for severe treatment-resistant hypertension. Its use for hair growth is off-label.
Men's 5 percent solution is commonly applied twice daily, while women's 5 percent foam is used once daily under their respective labels.
Yes. Oral minoxidil can cause serious cardiac complications, including pericardial effusion, and requires close medical supervision.
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