Finasteride in Australia: what it is, how it works, and how access works

Finasteride is a medicine that acts on the hormone pathway behind male pattern hair loss. In technical terms it is a type II 5-alpha-reductase inhibitor: it reduces how much testosterone your body converts into dihydrotestosterone, or DHT. DHT is the hormone most closely linked to the gradual shrinking of hair follicles in androgenetic alopecia, the common inherited form of hair loss. By lowering DHT, finasteride is used to slow that process and, for some men, to encourage regrowth.

The dose used for hair loss is 1mg taken orally once a day. A higher 5mg strength of the same medicine is used for a prostate condition, which is a different use entirely. Finasteride is a genuine prescription medicine with real clinical considerations, not a supplement, which is exactly why a practitioner has to be involved before anyone takes it.

In Australia, oral finasteride is a Schedule 4 medicine, which means prescription-only. Every oral strength, including the 1mg hair-loss dose, sits in the category that requires a registered practitioner to authorise supply. That reflects the fact that it carries real considerations: possible side effects, a serious warning around pregnancy, and suitability that depends on your individual health. None of that can be judged by a webpage or a marketing quiz.

It is worth knowing that the regulator has looked at whether the 1mg dose could be sold without a prescription and decided against it, keeping it prescription-only while safety signals continue to be monitored. So anyone offering guaranteed access to finasteride before an assessment is not operating the way a compliant Australian service should.

There are two mainstream routes, and both are valid.

Your GP, in person. A GP can assess you with full context, check anything relevant, and manage the treatment alongside the rest of your health. It is slower to get started and depends on appointment availability.

Online telehealth. A telehealth service runs an online questionnaire that a registered Australian practitioner reviews, and prescribes if it is appropriate, usually with home delivery. Worth understanding: Australian regulators tightened the rules in 2025 so that a prescription cannot rest on a questionnaire alone. A compliant service must include a genuine practitioner assessment, not just a form. Mosh is one Australian men's telehealth service that runs this model. You can read how it works in our Mosh hair-loss guide.

It is slow, and ongoing. Most people need three to six months or more of daily use before judging the effect, and any benefit only holds while you keep taking it. It is a long-term commitment rather than a quick fix.

Pregnancy warning. Finasteride carries a serious warning for women who are or may become pregnant, because of the risk to a developing male baby. Women in that group are advised not even to handle broken or crushed tablets.

Side effects. The most discussed are sexual, such as reduced libido or erection difficulties, generally reversible on stopping. Rarer reports of effects persisting after stopping are monitored by regulators. A practitioner is the person to weigh these against your own history.

It is often combined with minoxidil. Clinical reviews describe finasteride and topical minoxidil together as more effective than either on its own. We cover the second medicine in our guide to minoxidil in Australia.