Finasteride 5mg Tablets

Description

DHT — dihydrotestosterone — is the androgen responsible for two of the most common conditions affecting adult men: prostate enlargement and male pattern hair loss. It’s more potent than testosterone at androgen receptors, and in the prostate and scalp hair follicles specifically, its effects over time are significant and progressive. Finasteride works by shutting down the enzyme that makes DHT in the first place.

The Mechanism

5-alpha reductase is the enzyme that converts testosterone into DHT. Finasteride competitively inhibits it — blocking the conversion and reducing circulating DHT levels by approximately 70% at the 5mg dose. Less DHT means the prostate stops receiving the hormonal signal that drives its growth, and scalp hair follicles stop being progressively miniaturised by the androgen that causes pattern baldness.

It’s a targeted approach — addressing the hormonal root of the condition rather than managing symptoms after the fact. The difference from alpha-blockers (which relax prostate smooth muscle for symptomatic relief) is that finasteride actually reduces prostate volume over time, by roughly 20–30% in men with BPH.

Two Distinct Uses — One Mechanism

For BPH: Finasteride 5mg is the standard clinical dose for benign prostatic hyperplasia. Enlarged prostate tissue shrinks over three to six months of daily use, improving urinary flow, reducing urgency and frequency, and lowering the long-term risk of acute urinary retention and the need for surgery. The improvement is sustained as long as the medication is taken — if stopped, the prostate begins to regrow within months.

For hair loss: Although 1mg is the licensed hair loss dose, 5mg is used off-label by men who want stronger DHT suppression — particularly those who haven’t achieved adequate results at 1mg, or men managing hair loss alongside BPH who want a single dose to address both. At 5mg, scalp DHT levels are reduced by approximately 69% — a meaningful reduction that slows and in many cases reverses progressive hair thinning.

For men on TRT: Testosterone replacement therapy raises total testosterone, which in turn provides more substrate for 5-alpha reductase to convert to DHT. Some men on TRT experience DHT-related side effects — accelerated hair loss, prostate sensitivity — and use finasteride specifically to manage them by keeping DHT within range while testosterone levels are elevated.

Being Honest About Side Effects

Finasteride’s side effects are worth understanding clearly, because they’re frequently either overstated or understated depending on where you read about it.

Sexual side effects — reduced libido, erectile dysfunction, decreased ejaculatory volume — occur in a minority of users (roughly 3–5% in clinical trials) and typically resolve on stopping the medication. A smaller subset of men report these effects persisting after discontinuation — a phenomenon known as post-finasteride syndrome — though its prevalence and mechanism are still debated.

There’s also a less commonly discussed neurological mechanism: finasteride inhibits the production of neurosteroids including allopregnanolone, which is a natural modulator of GABA-A receptors in the brain. In some men this contributes to mood changes, low mood, or anxiety — an effect worth being aware of, particularly for men already managing mental health conditions.

PSA (prostate-specific antigen) levels are typically halved by finasteride — which means any PSA reading taken while on finasteride needs to be doubled to reflect the true value for prostate cancer screening purposes.

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For adult men only — not for use in women or children. Pregnant women must not handle crushed or broken finasteride tablets as it can cause birth defects. Finasteride halves PSA readings — inform any doctor ordering PSA tests that you are taking it. Monitor for mood changes, particularly if managing existing anxiety or depression.