My partner is on day ninety of 1 mg and his hairline looks identical. Has it failed?
Three months is the labelled first look
DailyMed writes the first benefit at three months or more of daily 1 mg finasteride. That is a clock, not a sales line. Weekends do not count as a trial. Neither does a wet-hair photo taken under a yellow bulb.
Serum DHT falls fast. The Propecia label records about 65% suppression within 24 hours of a 1 mg dose. Scalp hairs do not. They finish the cycle they already started. That lag is why men quit a tablet that has not had time to show.
Propecia 1 mg, cabinet lock
Hair dose1 mg once daily, with or without food
First labelled lookThree months or more of daily use
How to judgeSame-angle photos, not memory
If you stopEffect reverses within 12 months
Not this jobDo not split a 5 mg prostate tablet
Hair cycles in months. A 1 mg tablet cannot print a new hairline on a Friday.
Some men notice less hair in the shower drain before they see density. Others see nothing until a side-by-side photo. Both patterns sit inside the label. Neither proves the tablet failed.
If you started late, after a shiny bare patch has already formed, the first look can be flatter still. Follicles that have already shut have little tissue left to protect. The tablet does more for a crown that is thinning than for a hairline that has been smooth for a decade.
Keep taking the prescribed 1 mg tablet through that first window unless a clinician tells you to stop. Skipping weekends to 'test whether you still need it' just adds noise to a slow signal.
Same-angle photos beat the bathroom mirror
Bathroom lighting lies about density. So does a wet comb and a phone held high. The vertex trials that licensed Propecia used photographic enlargements of a fixed scalp circle, not a man's mood in the mirror.
Take two photos on day one: crown from above, hairline from the front. Same window, same hour, hair dry, camera at the same distance. Repeat at month three. Repeat at month six. Repeat at month twelve. That set is the file. A single shot in August proves nothing.
Day 1
Baseline photos. Start the 1 mg tablet. DHT is already falling.
Month 3
First labelled look. Compare the pair. Do not quit on a feeling.
Months 2-4
A shed can appear. Unsettling. Often temporary. Tell the prescriber if it is extreme.
Month 12
Most of the gain that is coming has usually declared. Decide with a clinician, not a comment thread.
Year 2-5
Treated men in the extensions held more hair than placebo because the untreated group kept thinning.
A mid-course shed can show up around months two to four. Weakened hairs leave so a later cycle can grow. It feels like the tablet is eating the hairline. Mention it if the shed is heavy. Do not bin the pack on day forty because the pillow looks worse.
Women in the house do not need a photo lecture. They need the handling rule in the last section. You need a dated pair of pictures and a calendar reminder at month three and month twelve.
If you never took a baseline, start now. A late baseline is still better than memory. Memory always votes for the haircut you had at twenty-two.
Stop and the gain walks back
Withdraw the 1 mg tablet and the labelled effect reverses within 12 months. The UK Propecia SmPC is a little more granular: benefit starts to slip by six months and is back near baseline by 9 to 12 months.
DHT is not a souvenir. It returns. The hair the tablet was protecting goes back on the old schedule. The clock does not reset in your favor.
In the US extensions, men who switched from Propecia to placebo after 12 months lost the hair-count rise by month 24. That is the maintenance part people skip when they treat this like a course of antibiotics.
Restarting later can move the count again. Men who spent a year on placebo and then started Propecia still gained, but they did not catch the men who had been on the tablet from month one. Time off is not free.
Stopping because a partner is trying to conceive is a different letter. Handling whole tablets is not the semen scare the internet sells. The labelled risk is crushed or broken tablets on skin in pregnancy. Talk that through with both clinicians. Do not ghost the pack and call it a plan.
Cost-saving on-off cycles also wreck the file. You cannot read month three if month three was a gap. Either stay on the 1 mg tablet or stop cleanly with a date in the notes.
Vertex counts, not weekend selfies
Vertex trials counted hairs inside a 1-inch circle (5.1 cm2). At 12 months the Propecia group sat 107 hairs above placebo (679 versus 672 men). At two years the gap was 138 hairs. At five years it was 277, mostly because placebo kept falling.
At 12 months, 58% of placebo men had further hair-count loss. Fourteen percent on Propecia did. At two years the figures were 72% versus 17%. At five years every remaining placebo man had lost count. Thirty-five percent on Propecia had.
A blinded photo panel at year five called 48% of treated men improved, 42% unchanged, and 10% worse. Placebo: 6% improved, 19% unchanged, 75% worse. Holding the line is a real result. It just photographs badly if you expected a new hairline by Saturday.
Men who started after a year on placebo gained less absolute hair than men who started on day one (56 hairs above the original baseline versus 91). The later start still moved the count. It did not buy back the year that was lost.
A 48-week phototrichogram in 212 men found a between-group gap of 17 total hairs and 27 anagen hairs in a 1 cm2 patch.
The tablet does nothing for thyroid shedding, iron-poor shedding, telogen after a fever, or a scarred patch. Those are different files. If the pattern is not male-pattern, 1 mg finasteride is the wrong lock.
It also failed as a hair drug in a 12-month study of 137 postmenopausal women. The label does not give this tablet to women. I do not either.
Sexual reports, mood, and the PSA trap
Sexual complaints sat a little above placebo in the 12-month Propecia trials. Combined decreased libido, erectile difficulty, or ejaculation problems: 3.8% (36 of 945) on the tablet versus 2.1% (20 of 934) on placebo. Drug-related dropouts were 1.4% versus 1.6%. Most men who stopped for those effects improved. Most who stayed also improved. By year five each of those complaints sat at 0.3% or less.
PSA moves on this drug. In men 18 to 41 on 1 mg, mean PSA went from 0.7 ng/mL to 0.5 ng/mL at month 12. The 5 mg prostate studies cut PSA by about half. Tell whoever orders the test. A confirmed rise from your lowest on-treatment value still needs a look, even if the number looks 'normal' for a man not taking a 5-alpha-reductase inhibitor.
A smaller group reports the same sexual symptoms after stopping. Labels now mention persistent reports. Trial rates do not pin a clean percentage on that tail. I disclose the tail. I do not invent a number the file does not have.
Mood is on the UK patient leaflet as a stop-and-call item: depressed mood, depression, and, less often, suicidal thoughts. Stop the tablet and contact the prescriber. Do not wait to 'see if it is just stress' for a month.
Breast tenderness, a lump, pain, or nipple discharge also get a prompt call. Rare. Worth a same-week appointment, not a search-tab spiral at 1 a.m.
Most men on 1 mg notice nothing sexual. Track function in a sentence, not a daily score.
The hair lock is 1 mg, once
Hair loss uses one milligram once a day. The US Propecia label is blunt: one 1 mg tablet daily, with or without meals. Taking it twice does not make hair arrive sooner. The same label says it will not work faster or better if you take more than one tablet a day.
Forums still push a 5 mg Proscar tablet snapped into quarters. That is not the labelled hair dose. It is a different licensed job. The 1 mg film-coated tablet is the hair product. I file it that way and I do not coach splitting.
A 5 mg tablet exists. It is a prostate tablet. Using it as homemade 1 mg pieces is a dosing error, not a clever save. The pieces are not even, the coating is broken, and a pregnant person in the house then has powder to avoid.
Swallow the 1 mg tablet whole. Food does not change absorption on the Propecia label. Take it with breakfast if that is the habit that keeps you from missing days. Take it at night if that is the habit that sticks. The lock is daily, not timed to a meal.
Missed a tablet? Take it when you remember unless the next one is due. Do not double up. One extra milligram is not a catch-up dose. It is just a second tablet.
If twelve months of honest 1 mg use has not slowed the loss, the next talk is with the prescriber. Adding a topical, changing the plan, or stopping is a clinic decision. Raising finasteride on a forum thread is not.
Whole tablets, pregnant hands, and the file
Coated whole tablets stay safe to handle in ordinary life. Crushed or broken Propecia tablets are a different object. Finasteride can cross skin. The label ties that exposure to abnormal genital development in a male fetus. Anyone who is pregnant, or who might be, should not handle a broken tablet.
Keep the strip in the original pack, on a shelf she does not need. He swallows the tablet whole. If one snaps, he bins the pieces and washes his hands. That is the household rule. It is not optional because 'we are careful.'
Semen levels were measured in 35 men on 1 mg for six weeks. Sixty percent of samples had no detectable drug. The highest level was 1.52 ng/mL. That is not a reason to hide the bottle. It is a reason to keep the tablet intact and the counseling honest.
Children do not get this tablet. Women do not get this tablet for hair. A postmenopausal study did not show a hair benefit. Off-label use in women is a specialist file, not a cabinet note from Lyon.
When the photos at month twelve are in, sit with the prescriber and decide: stay, add something, or stop. The pharmacology behind that talk lives on the finasteride cabinet note. This page is the shorter hair file.