Alternatives to Dutasteride If You Can't Fill Your Prescription

Dutasteride (Avodart) is generally well-stocked as a generic, but there are times when your local pharmacy simply doesn't have it. Whether there's a temporary stocking gap, a supply issue with a specific manufacturer, or you're looking for a more affordable option, knowing your alternatives puts you in control. This guide covers the best alternatives to dutasteride — for both BPH and hair loss — that you can discuss with your prescriber.

Important: Don't Switch Without Talking to Your Doctor

Before switching away from dutasteride, speak with your prescriber. Because dutasteride has a very long half-life of about 4-5 weeks, it stays in your system long after you stop taking it — so the transition timeline to an alternative is different than it would be for most drugs. Your doctor will know which alternative is most appropriate for your specific condition and history.

Alternatives to Dutasteride for BPH (Enlarged Prostate)

Dutasteride belongs to a class of medications called 5-alpha reductase inhibitors (5-ARIs). These drugs shrink the prostate by blocking the production of DHT, the hormone that drives prostate growth. There is one direct alternative in the same class, and several other medication classes used for BPH.

1. Finasteride (Proscar) — The Closest Alternative

Finasteride is the most direct substitute for dutasteride. Like dutasteride, it's a 5-alpha reductase inhibitor. Both drugs work the same basic way — blocking DHT production to shrink the prostate and relieve BPH symptoms. Key differences:

Dutasteride inhibits both type I and type II 5-alpha reductase enzymes, reducing DHT by up to 98%.

Finasteride only inhibits type II, reducing DHT by about 65-70%. It is FDA-approved for BPH (as Proscar 5 mg) and hair loss (as Propecia 1 mg).

Finasteride has a much shorter half-life (5-8 hours) compared to dutasteride (4-5 weeks), which can be an advantage if you experience side effects.

Generic finasteride is typically very inexpensive — around $12 or less per month with GoodRx — and is widely stocked at almost all pharmacies.

In clinical trials, dutasteride and finasteride show similar overall efficacy for BPH symptom relief. If you can't find dutasteride, finasteride is often the most practical first alternative to discuss with your prescriber.

2. Tamsulosin (Flomax) — Alpha-Blocker for Faster Relief

Tamsulosin (brand name Flomax) is an alpha-blocker, not a 5-ARI. It works differently from dutasteride — it relaxes the muscles in the prostate and bladder neck, making it easier to urinate. Unlike dutasteride, tamsulosin does not shrink the prostate; it simply relaxes the muscles around it.

Key advantage: Works within days (much faster than dutasteride's 3-6 months).

Key limitation: Does not change the underlying prostate size; does not reduce cancer risk or surgery risk.

Tamsulosin and dutasteride are available together as a combination pill called Jalyn.

3. Other Alpha-Blockers

Several other alpha-blockers are approved for BPH, including:

Silodosin (Rapaflo) — a highly selective alpha-1A blocker with fast onset; may cause retrograde ejaculation.

Doxazosin (Cardura) — also treats high blood pressure; may cause dizziness.

Alfuzosin (Uroxatral) — less likely to cause ejaculatory dysfunction than tamsulosin or silodosin.

4. Tadalafil (Cialis) for BPH

Tadalafil (Cialis), well known as an erectile dysfunction treatment, is also FDA-approved at a daily low dose (5 mg) for BPH. It relaxes smooth muscle tissue in the prostate and bladder, improving urinary flow. It doesn't shrink the prostate like dutasteride, but it may be useful if you also experience ED.

Alternatives for Hair Loss (Off-Label Use)

If you're using dutasteride off-label for androgenetic alopecia (male or female pattern hair loss), these alternatives are worth discussing with your dermatologist or prescriber:

Finasteride 1 mg (Propecia) — FDA-approved for male pattern hair loss; reduces DHT by ~65-70%; widely available generic.

Topical minoxidil (Rogaine) — available OTC in 2% and 5% solutions/foam; extends hair growth cycle; often combined with finasteride or dutasteride.

Oral minoxidil — low-dose oral minoxidil (0.625–5 mg) is gaining traction as an off-label treatment for both male and female pattern hair loss.

Topical dutasteride or finasteride — compounded topical formulations may reduce systemic side effects while still acting on scalp follicles.

The Bottom Line

The best alternative to dutasteride depends on whether you're treating BPH, hair loss, or both. For BPH, finasteride is the most direct swap. For hair loss, finasteride or minoxidil are the go-to alternatives. Always consult your prescriber before switching. And remember — before giving up on dutasteride entirely, use tools like medfinder to check whether it's available at other pharmacies near you.