Minoxidil

Minoxidil is a topical medication that treats hair loss in both men and women. It comes as a liquid solution or foam that you apply directly to your scalp. The medication was originally developed to treat high blood pressure, but doctors noticed an interesting side effect. Patients taking it grew more hair.

Today, minoxidil is available without a prescription for treating pattern hair loss. The FDA approved it for hair regrowth in the 1980s. You can find it under brand names like Rogaine or as generic minoxidil. It works best for people who have recently started losing hair, though it can help many different types of hair loss.

Minoxidil cannot cure baldness or restore a full head of hair. It can slow down hair loss and help regrow some hair in many users. Results vary from person to person. You need to use it consistently for at least 4 months to see if it works for you.

• Male pattern baldness, also called androgenetic alopecia in men
• Female pattern hair loss, a common cause of thinning hair in women
• Hair thinning at the crown or top of the scalp
• Alopecia areata, an autoimmune condition causing patchy hair loss
• Hair loss due to stress or temporary medical conditions

Minoxidil widens blood vessels in your scalp. This brings more oxygen and nutrients to your hair follicles. The medication extends the growth phase of your hair cycle, which means each hair stays on your head longer before falling out. It also wakes up shrunken hair follicles and increases their size. Larger follicles produce thicker, more visible hairs.

The exact way minoxidil promotes hair growth is not fully understood. Scientists believe it may open potassium channels in cells and stimulate certain growth factors. What we do know is that it takes time to work. You may see some hair shedding in the first few weeks as old hairs fall out to make room for new growth. Most people see results after 4 to 6 months of daily use.

For adults, the typical dose is 1 milliliter applied to the affected area twice daily. Men can use either 2% or 5% strength minoxidil. Women typically use 2% strength, though 5% foam is also approved for women. Apply the solution or foam to a dry scalp. Wash your hands after applying. Do not use more than the recommended amount, as this will not speed up results. Continue using minoxidil daily to maintain any hair growth you achieve.

• Itching or irritation where you apply the medication
• Dry or flaking skin on the scalp
• Temporary increase in hair shedding during the first 2 to 6 weeks
• Unwanted facial hair growth, especially in women
• Redness or burning sensation on the scalp
• Changes in hair color or texture

Serious side effects are rare but require immediate medical attention. Stop using minoxidil and contact a doctor if you experience chest pain, rapid heartbeat, swelling of hands or feet, sudden weight gain, dizziness, or fainting. These symptoms may indicate the medication is affecting your heart or blood pressure. Avoid getting minoxidil in your eyes, nose, or mouth, as it can cause irritation.

• Blood pressure medications may interact with minoxidil absorbed through the scalp
• Topical corticosteroids applied to the scalp may increase minoxidil absorption
• Retinoids like tretinoin can enhance minoxidil penetration into skin
• Guanethidine and other blood pressure drugs may have additive effects
• Avoid using other topical products on your scalp at the same time
• Do not use minoxidil if you have a scalp infection or open wounds

Minoxidil does not typically require regular blood tests for monitoring. However, if you have heart disease, high blood pressure, or kidney problems, your doctor may want to check your blood pressure regularly. Some healthcare providers recommend checking kidney function with a creatinine test before starting minoxidil, especially if you have existing kidney issues. If you experience side effects like rapid heartbeat or fluid retention, your doctor may order tests to check your heart function and electrolyte levels. Most healthy people using topical minoxidil for hair loss do not need routine blood work.