Finasteride 5mg Oral Hair Loss Treatment

Finasteride 5mg Tablets (Split-Dose for Hair Loss)

Prescription finasteride 5mg, taken as a split dose for hair loss. The tablet is scored and split so you take a fraction of a tablet: typically half daily, or half 3x weekly, delivering a hair-loss dose from the more cost-effective 5mg pack size. Under prescriber supervision.

How finasteride works for hair loss

Finasteride is a Type II 5-alpha reductase inhibitor. It blocks the enzyme that converts testosterone into dihydrotestosterone (DHT), the hormone responsible for miniaturising hair follicles in men with male pattern hair loss.

The licensed hair-loss dose is 1mg daily, which reduces serum DHT by around 70%. Taking a split fraction of a 5mg tablet delivers a similar hair-loss dose at a lower cost per month. This is a well-established off-label practice supported by pharmacokinetic evidence that even lower doses (0.2mg) produce meaningful DHT suppression.

Dosing

The 5mg tablet is scored and typically split for hair-loss dosing. Standard UK approach:

• Half tablet daily (2.5mg): the most common split-dose approach. Delivers robust DHT suppression, close to what 1mg daily produces.
• Half tablet 3 times per week (2.5mg 3x/week): lower total exposure while still meaningful. Often used by men who want the minimum effective dose.

A quality pill splitter is essential for accurate halves. Take at any time of day, with or without food. Consistency matters more than timing.

What to expect

• 2 to 3 months: reduced shedding is often the first sign
• 4 to 6 months: visible thickening and some regrowth on the crown and mid-scalp
• 12 months: full effect is judged. Results plateau and are maintained by continued daily use
• On stopping: any hair gained is lost over 6 to 12 months as DHT returns to normal

Side effects

Most men take split-dose finasteride without issue. Original phase III trials at 1mg daily reported sexual side effects in around 3 to 4% of men, with a similar rate in the placebo arm.

Uncommon (roughly 1 in 100)

• Reduced libido, usually mild
• Erectile dysfunction
• Changes to ejaculation volume

Rare (less than 1 in 1,000)

• Breast tenderness or enlargement
• Mood changes (incidence unclear, still reported)
• Persistent sexual effects after stopping treatment

Very rare (less than 1 in 10,000)

• Reduced semen quality or male infertility (worth discussing with your prescriber if you are actively trying to conceive)
• Testicular pain or discomfort
• Changes in liver function

When to seek urgent medical advice

• Signs of allergic reaction: facial or lip swelling, difficulty breathing, rash
• Significant mood change or thoughts of self-harm
• Unusual breast lumps or nipple discharge

Who should not take finasteride

• Women, in any circumstance
• Anyone under 18
• Anyone with a known allergy to finasteride
• Anyone with severe liver disease should be reviewed carefully

Pregnancy and fertility

Finasteride can affect a male foetus. The tablets are film-coated, so simply taking finasteride does not expose a pregnant partner. The risk arises only if a pregnant woman handles a broken or crushed tablet. Store the pack securely, split tablets away from anyone pregnant, and wash your hands after handling.

Warnings and precautions

• Post-finasteride syndrome: if you have previously stopped finasteride due to persistent sexual, mood or physical effects, disclose this on the questionnaire so your prescriber can review carefully
• Concurrent DHT-blocking treatment: do not combine with dutasteride or topical finasteride/dutasteride without prescriber guidance. Combining increases systemic exposure and side-effect risk
• PSA screening: finasteride at 5mg (the BPH dose) is known to lower PSA blood test results by around 50%. At split hair-loss doses the PSA effect is smaller but still present. Tell your GP you take finasteride if you have a PSA test
• Fertility planning: if you and your partner are actively trying to conceive, discuss with your prescriber before starting

Split-dose 5mg vs licensed 1mg tablets

The licensed hair-loss product is finasteride 1mg daily. Split-dose 5mg is an off-label approach that delivers a similar effective dose at lower cost per month. Some men prefer the licensed 1mg for simplicity (no splitting needed); others prefer the 5mg pack for value. Both are legitimate options prescribed regularly in UK practice.

Supply note

We supply finasteride 5mg from a range of MHRA-approved UK or EU manufacturers. The active ingredient and strength are identical across manufacturers.

Prescription included

Complete the short online health questionnaire at checkout. A UK prescriber reviews your answers; most approvals are the same day. Your tablets are dispensed by a GPhC registered UK partner pharmacy and delivered free.