Dutasteride
Avodart, Jalyn, Duodart
Forms: Soft capsules; also combined with tamsulosin for prostate enlargement.
A dual 5α-reductase inhibitor (types I and II) that suppresses DHT more deeply than finasteride and stays in the body for months. Prescription treatment for an enlarged prostate.
Legal status: Prescription medicine in most countries; not on the WADA Prohibited List.
What it gives
What people use it for and what the sources report. Strength is a general category from the literature: mild, clear or strong.
Purpose
Approved for benign prostate enlargement; also used for hair loss, off-label in most countries. In sport, used like finasteride to limit hair loss and prostate growth during testosterone use, with the same nandrolone problem. Prescription only, under a doctor.
What people seek and what studies show
Blocking both enzyme types, it lowered blood DHT by about 95%, versus about 70% with finasteride. In a six-month trial in 917 men with male-pattern hair loss it increased hair count and thickness more than finasteride. In an enlarged prostate it shrinks the gland and lowers the risk of urinary retention and surgery. It has not been studied alongside steroid use.
Effects
Evidence: Approved medicine — studied in people for its medical use
Sought effects by goal (as reported)
Possible side effects
Possible does not mean certain: whether they appear depends on dose, duration, individual response and monitoring. Below — what to watch for and how to notice it early.
3 possible side effects
level · how often it is reportedWhat the levels mean
Level: general category from the literature, not your personal risk
How often
- common
- reported often
- possible
- reported in some people
- rare
- reported occasionally
How to lower the risks
For 3 of 3 possible side effects there are specific ways to lower the chance: everyday measures, supplements and options a doctor may consider. No measure removes a risk completely.
Find the cause by tests (estradiol, prolactin, testosterone) rather than guessing.
How each option helps (1)
- Working with a doctor — Finds the cause of low libido or erectile problems instead of masking it.
Keep routine and social contact; talk to a specialist if low mood persists.
How each option helps (2)
- Working with a doctor — Mood problems, especially after stopping steroids, are treatable; a doctor can refer you to mental-health care.
- Sleep hygiene — Good sleep supports mood, especially in the low-hormone phase after stopping steroids.
React early: see a doctor at the first lump, check estradiol and prolactin.
How each option helps (1)
- Working with a doctor — Early assessment of breast-tissue growth allows treatment before the change becomes permanent.
Check-ups and blood tests
Which tests and check-ups to do and when. This is a guide — agree the exact schedule with your doctor.
Which doctors can help
Get medical help at once if
- A painful lump under the nipple or nipple discharge — see a doctor early, while it can still regress; a hard, painless or fixed lump, skin dimpling or bloody discharge — see a doctor promptly.
- Thoughts of suicide or self-harm — contact emergency services or a crisis line right now.
In an emergency, call your local emergency number.
For women
Contraindicated in women who are or may become pregnant (it can harm a male fetus); it is absorbed through the skin, so they must not touch leaking capsules.
Myth & fact
“Stronger DHT blocking means no hair loss whatever steroid you use.”
Like finasteride, it only lowers DHT made from testosterone. It can backfire with nandrolone, and its effects, wanted or not, last for months after stopping.
Combinations
In skin and scalp, 5α-reductase turns nandrolone into a much weaker androgen. Finasteride or dutasteride block that step, so more active nandrolone stays there: they do not protect against its hair loss and may make androgenic effects stronger.
NandroloneFinasterideSame enzyme, same goal: together they add no meaningful benefit, while sexual side effects and mood changes can add up.
FinasterideSources
Possible side effects by body system, combinations, how to lower the risks and which tests to do — free.
Open the stack check