Can I take dutasteride weekly to treat BPH?

[man_li]

As dutasteride half-life is about 5 weeks, can I use it just 0.5mg (one capsule) weekly for BPH (Benign prostatic hyperplasia) to avoid side-effects?

I found lots of anecdotes in reddit, but not sure. Thank you.

https://www.reddit.com/r/tressless/comments/pv36kk/is_dutasteride_effective_enough_if_taking_once_a/

[Jay]

Here is what Google Gemini says:

Yes, dutasteride can be taken less than daily and still be effective, though taking it strictly once weekly is less common than other non-daily schedules. Because dutasteride has an exceptionally long 4-to-5-week half-life and binds tightly to tissues, the drug remains active in your scalp and system for a prolonged period, meaning you do not need to take it every single day to suppress DHT. [1, 2, 3]

However, how effective it is—and whether it is right for you—depends heavily on your specific medical goal and dosing history:

1. For Hair Loss (Androgenetic Alopecia)

• As an Add-On to Daily Finasteride: A common and highly effective clinical strategy is to take finasteride 1 mg daily, but swap or add a single 0.5 mg dutasteride capsule once a week. This provides a potent “boost” to DHT suppression without committing to a full daily dutasteride regimen. [1]
• As Monotherapy (Stand-Alone): If you are taking only dutasteride, a strictly once-weekly dose is usually considered too low to achieve maximum hair regrowth on its own.
  • What the data shows: Clinical studies on non-daily dutasteride for hair loss typically look at twice-weekly or thrice-weekly dosing (e.g., taking it every Monday, Wednesday, and Friday). Research indicates that thrice-weekly dutasteride is highly effective—even outperforming daily finasteride in hair thickness and density—while a twice-weekly or once-weekly schedule shows significantly lower hair count gains by comparison.
  • The “Build-Up” Factor: Dutasteride requires a substantial “loading” period to reach steady levels in your blood and scalp. Taking it only once a week from the very start makes it incredibly difficult for the drug to accumulate enough to achieve maximum DHT inhibition. [1, 2, 3, 4, 5]

2. For Prostate Enlargement (BPH)

• Not recommended once weekly. Dutasteride is FDA-approved for Benign Prostatic Hyperplasia (BPH) at a daily dose of 0.5 mg. A study evaluating reduced doses for prostate symptoms found that while a daily or every-other-day schedule successfully reduced prostate volume, a once-weekly schedule failed to achieve meaningful prostate size reduction. [1, 2, 3]

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Comparison of Non-Daily Dutasteride Schedules (For Hair Loss)

Dosing Frequency	Efficacy Level	Common Clinical Use Case
Once Weekly	Moderate (Lower on its own, high if combined)	Used to boost results for patients already taking daily Finasteride.
Twice Weekly	Good	A budget-friendly or side-effect-mitigating alternative; slightly less effective than daily finasteride. (e.g. Monday and Friday)
Thrice Weekly	Excellent	A highly popular off-label regimen; statistically superior to daily finasteride for hair density. (e.g. Monday, Wednesday, Friday)
Once Daily	Maximum	The standard off-label dose for maximum possible hair regrowth, but carries the highest potential for persistent side effects.

[man_li]

I suppose two times weekly is the sweet spot between effectiveness and side-effect.

https://www.reddit.com/r/tressless/comments/1iu2mqx/anyone_had_success_with_01_mg_dut_per_day/

Low Dose Dutasteride Better Than Finasteride

[man_li]

Given dutasteride long half-life, I have decided to take it for two consecutive days each week, which is also more convenient.

[Jay]

two consecutive days each week

How you do it is perfectly fine with me, but if I were using it twice weekly I would spread it out as evenly as possibly to get the best benefit, such as Monday and Friday of each week.

[tananth]

Just another N=1: I scaled back my dutasteride use to 1 per month for the last 2 years, after initially using it once weekly for BPH, which resolved my BPH. My BPH has NOT come back and my blood test for DHT (DihydroTestosterone) was 10 ng/dL most recently, taken just before my next monthly dose. At that level of DHT it is unlikely my BPH will come back.

I am considering dropping to one capsule of 0.5mg Dutasteride every 2 months, to allow my peak DHT levels to increase to 15 ng/dL. Certain neurotransmitters are produced by using 5-alpha reductase and you can trigger persistant PPD (Post Partum Depression) if 5-alpha reductase is suppressed for too long. This hasn’t happened to me yet, but I don’t want to take the chance, given that the only cure is a drug (Zurzuvae) that costs $16,000 (per 2 week course) in USA.

PS: In men the Depression is actually called PFS (Post Finasteride Syndrome) but like PPD it is caused by deficiency of Neurotransmitter Allopregnanolone, which requires 5-alpha reductase for synthesis from Progesterone. The drug Zurzuvae is an orally absorbable form of the peptide Allopregnanolone.

[man_li]

Thank you for your info, very helpful.

By the way, when you initially take Dutasteride once weekly, how long did it take for you to feel better about BPH. I heard that even though taking Dutasteride daily, improvement in BPH will only be seen in 3~6 months.

[tananth]

It took 3 months to have any noticeable affect and 12 months before most BPH symptoms were gone. In my case I started on Dutasteride as soon as I had noticeable BPH so my BPH was not that advanced.