Hair Loss Medications: Minoxidil, Finasteride and More

For pattern hair loss, minoxidil and finasteride are the two medications with the most research behind them. Minoxidil helps follicles stay in their growing phase, while finasteride reduces the hormone that shrinks follicles. Other options, such as anti-androgen medicines for some women, exist too, but every hair loss medicine has side effects and limits, and the right choice depends on your diagnosis and health history.

First, confirm the diagnosis

These medications are designed mainly for androgenetic alopecia, the inherited pattern of thinning. They are not the answer for hair loss from low iron, thyroid disease, alopecia areata or scarring conditions, which need different care. If your hair loss is sudden, patchy, itchy or painful, or you have other symptoms, see your family doctor first. Our article on the common causes of hair loss explains why this step matters.

It also helps to know that these medicines work slowly. Most people need at least six months of consistent use before judging the effect, and benefits generally last only as long as the medicine is used.

Minoxidil

How it works

Minoxidil was first developed as a blood pressure tablet, and hair growth was noticed as a side effect. Its exact action on follicles is not fully understood, but it appears to lengthen the growing phase and enlarge follicles that have started to shrink.

Forms and access

Topical minoxidil, available as a liquid or foam, can be bought without a prescription in Canada and is used by both men and women, at strengths suited to each. Low-dose oral minoxidil is increasingly prescribed for hair loss by some physicians. That is an off-label use, meaning the tablet is not officially approved for hair loss, and it requires a medical assessment and follow-up.

Side effects

• Scalp irritation, itching or flaking, often related to other ingredients in the liquid
• Temporary increased shedding in the first weeks to couple of months, which usually settles
• Unwanted hair growth on the face or body, more noticeable with the oral form
• With oral minoxidil: possible lightheadedness, fluid retention, ankle swelling or a faster heartbeat

Minoxidil is not recommended during pregnancy or breastfeeding. People with heart conditions, low blood pressure or kidney problems need a careful review, especially before taking it by mouth. Topical minoxidil can be harmful to pets, particularly cats, so care is needed at home.

Finasteride

How it works

Finasteride blocks the enzyme 5-alpha reductase, which converts testosterone into dihydrotestosterone (DHT). Lower DHT means less pressure on genetically sensitive follicles. In men with pattern hair loss, it is one of the most effective medical options for slowing loss, and some men see regrowth.

Forms and access

Finasteride is a prescription medication, usually taken as a daily tablet. Topical versions are also prescribed in some cases. It is mainly used in men. Its use in women is limited to specific situations, such as after menopause, and only under careful medical supervision.

Side effects and cautions

• A small proportion of men report sexual side effects, such as lower libido or erectile changes. These usually resolve after stopping, though persistent symptoms have been reported.
• Mood changes, including depression, have been reported; anyone with a history of depression should discuss this first, and any low mood should be reported promptly.
• Breast tenderness or enlargement is uncommon.
• Finasteride lowers PSA levels, a blood test used in prostate screening, so your doctor needs to know you are taking it.

Finasteride must not be used by anyone who is pregnant or may become pregnant, because it can affect the development of a male fetus. Pregnant people should also avoid handling crushed or broken tablets. Men who are actively trying to conceive should talk to their doctor about timing.

Other medications

Dutasteride works in a similar way to finasteride but blocks the enzyme more broadly. Some physicians consider it off-label for hair loss in selected men. It has similar cautions and stays in the body longer after stopping.

Spironolactone is an anti-androgen sometimes prescribed off-label for female pattern hair loss, especially when there are signs of higher androgen activity. It can raise potassium levels, cause irregular periods or dizziness, and must not be used during pregnancy, so reliable contraception and medical monitoring are required.

Other prescription treatments, such as corticosteroids or newer immune-targeting medicines, are used for alopecia areata and other conditions. Those are typically managed by a dermatologist.

Why a physician should be involved

Even when a product is sold over the counter, it is worth discussing hair loss treatment with a doctor. A physician can confirm the cause, check for conditions that make a medication unsafe, review interactions with your other medicines, and explain realistic expectations. Prescription options need a prescriber, and oral minoxidil and anti-androgens need follow-up.

Avoid buying hair loss medicines from unregulated online sellers. Products may be mislabelled or contain the wrong dose. And never stop a medication prescribed for another condition, such as a blood pressure pill or blood thinner, in the hope that it will help your hair; talk to the prescriber first.

Medication is often the foundation of a hair plan, and some people choose to add other treatments. See combining PRP with other hair loss treatments for how the pieces can fit together.

Frequently asked questions

Do I have to use these medicines forever?

For pattern hair loss, the benefit usually lasts only while you keep using the medicine. If you stop, hair tends to return toward where it would have been over several months.

Can women use finasteride?

Only in limited situations, usually after menopause, and only under close medical supervision. It must never be used by anyone who could become pregnant.

Which works faster, minoxidil or finasteride?

Neither works quickly. Both generally need several months before any change is visible, and a full assessment usually takes six to twelve months.

Can I use more than one medication?

Some people use minoxidil and finasteride together under medical guidance, since they work in different ways. Your physician can help decide whether that makes sense for you.

If you would like to understand which medication, if any, might be appropriate for your hair loss, a consultation at HealthPark Medical Aesthetics includes a medical history review, a scalp assessment and a clear discussion of benefits, side effects and alternatives. Where your family doctor or a dermatologist is better placed to help, we will say so.