Finasteride 1 mg is the hair-loss lock, not a split Proscar

01Open: the 1 mg lock is a different NDC from Proscar

Opened 21 August 2026. Correspondent: Dr. Nora Lindqvist. Scope: 1 mg daily lock, vertex evidence, PSA and pregnancy handling.

Propecia one milligram is a hair-loss tablet. Proscar five milligrams treats symptomatic BPH. Splitting a 5 mg scored tablet to chase a cheap 1 mg fill is a compounding stunt, not the labelled Propecia path.

Organon still writes the Propecia sheet as men only. Initial US approval for finasteride was 1992. The 1 mg androgenetic-alopecia indication landed in 1997. Those dates sit on the PI, not on a forum timeline.

This despatch opens on milligrams because the cash board and the chart use different language. A window that hears 'finasteride' may pull 5 mg. Say 1 mg for male pattern hair loss, or the NDC is wrong before the first swallow.

Nora Lindqvist countersigns hair-loss letters on the Stockholm desk. Method is Open, Annotate, Countersign, Seal - the same four stamps on the method page. Mail that needs a human reply goes to [email protected]. The letter does not dispense.

Crown thinning is the trial terrain. Frontal temples were not the photo circle. Men who want a teenage hairline back are asking the tablet for a job it never took in the 12-month program.

02Vertex counts from the 1879-man program

Eighteen hundred seventy-nine men sat in three 12-month, placebo-controlled studies. Age 18-41. Mild to moderate loss. Not complete baldness. 88% Caucasian. Two studies were vertex (n=1553). One was anterior mid-scalp (n=326) and left the temples out of the count circle.

At 12 months the vertex pair showed a 107-hair difference versus placebo inside a 1-inch (5.1 cm2) circle. At 2 years the difference was 138 hairs in men who stayed on drug. Peak hair-count gain versus baseline landed in the first 2 years, then drifted down while staying above baseline through year 5.

Switch from Propecia to placebo after year 1 erased the count gain by month 24. Switch from placebo to drug later still grew hair, but the absolute count lagged men who started in month 1. Delay has a price.

At 12 months, 14% on drug had further count loss versus 58% on placebo. At 5 years those figures were 35% versus 100% of the remaining placebo group. Investigator 'increased growth' scores: 65% versus 37% at year 1, 77% versus 15% at year 5.

Blinded photo panel at year 1: increase in 48% on drug versus 7% on placebo. Anterior mid-scalp counts rose too. Bitemporal recession was not in that circle. Do not sell a temple rebuild from this program.

A separate 48-week phototrichogram in 212 men counted a 1 cm2 vertex patch. Drug gained 7 total hairs and 18 anagen hairs from baseline. Placebo lost 10 and 9. Between-group gaps: 17 total, 27 anagen. The anagen fraction moved from 62% to 68% on drug. That is a cycle-quality signal, not a density miracle in one square centimetre.

All men in the early years used a specified tar shampoo so seborrhoea would not confuse counts. That detail is easy to skip and easy to over-read. The shampoo was a study control, not a required partner drug on the commercial label.

03Crushed-tablet pregnancy rule and household handling

A pregnant partner should never handle crushed or broken 1 mg tablets. Type II blockade can disrupt external genitalia in a male fetus. Intact film-coated tablets are the ordinary handling path. Soap and water if skin contact with a broken tablet happens.

Pregnancy is a contraindication. Hypersensitivity to a tablet component is the other. The sheet is not indicated in women or in children. Do not 'share a leftover' across a couple.

Blood donation rules in many systems ask 5-ARI users to wait. Check the local blood service, not a hair-loss Discord. The molecule is small and the donation bag is not a private risk.

Mood change, anhedonia, or new suicidal thinking is a same-week clinical call, not a 'push through month three' slogan. Nora Lindqvist's correspondent page is biography, not a remote clinic.

Keep tablets in the original blister away from kids. 1 mg looks like a vitamin to a toddler. That is a poison-control problem, not a dose puzzle.

04When 5 mg Proscar is the wrong ask at the window

Asking the window for five milligrams 'because it is the same drug' collapses two labels. Proscar's sexual-event table, PLESS, MTOPS, and PCPT are 5 mg stories. Hair-loss counselling still uses the 1 mg Year-1 table first.

Some men already take 5 mg for BPH. They do not need a second 1 mg Propecia on top. Duplicate 5-ARI is a chart error. If both indications matter, one prescriber owns the milligram.

Generic 1 mg and brand Propecia are the same lock when the NDC is 1 mg. Color and shape changes between manufacturers are dye, not potency. A sudden switch to unmarked foil from a website is a different problem.

If erection trouble on 1 mg needs a PDE5 trial, that is a separate letter. See the sildenafil letter for meal timing and nitrate stops. Do not start a PDE5 tablet to 'prove' finasteride guilt in week two.

Educational desk only. Read the full disclaimer. Prescription and milligram changes stay with the clinician who holds the chart.

Overdose experience on the PI is thin: single doses to 400 mg and multiple doses to 80 mg/day for three months in small sets did not produce a defined toxic syndrome. There is still no specific antidote sentence. Do not treat that as a licence to multiply 1 mg tablets.

Storage is ordinary room-temperature film-coated tablets. Humidity in a bathroom cabinet is how coatings crack and how a pregnant hand meets a broken edge. Keep the blister dry and closed.

05Ninety days before anyone should judge the crown

Three months of daily swallows is the labelled wait before benefit is observed. Earlier mirror checks mostly catch lighting and haircut, not miniaturised follicles turning around.

Continued use is recommended to sustain benefit. Withdrawal reverses the effect within 12 months. That is maintenance chemistry, not a course you finish and keep.

Self-assessment in the vertex trials moved as early as month three versus placebo. Investigator scores moved on the same clock. Photograph panels are slower and less kind to hope.

A 90-day board matches that clock better than a seven-tablet starter pack. The Juvia lock is generic 1 mg x 90. Ask the window for that count. Do not accept a 5 mg bottle and a kitchen knife.

Pair the calendar with two photos, same bathroom, same light. Month 0 and month 6 beat weekly selfie panic. The duration postscript walks the shed that follows a stop.

06Type II enzyme and the 65 percent DHT drop

Type II 5-alpha-reductase sits in hair follicles, prostate, and liver. It makes two-thirds of circulating DHT. Type I, more a sebaceous-gland enzyme, makes the other third. Finasteride prefers Type II by about 100-fold in binding work on native tissue.

One milligram drops serum DHT about 65% within 24 hours. Testosterone and estradiol rise about 15% and stay in the physiologic range. Scalp DHT falls too. The PI does not rank which drop does the hair work.

Balding scalp already holds more DHT than hairy scalp in the same man. Lowering that androgen slows miniaturisation in follicles that still have a cycle left. Dead follicles do not sprout because a tablet arrived.

The enzyme-inhibitor complex turns over slowly. Type II complex half-life is on the order of 30 days in the mechanism section. That is why a missed Sunday does not erase the month, and why a two-week holiday can.

Dutasteride hits both isozymes. It is not this lock. Do not stack 5-ARI drugs. One labelled tablet, one indication, one chart line.

IC50 values on native tissue were about 4.2 nM for Type II and 500 nM for Type I. That ratio is why the desk talks Type II first and does not promise sebum or acne changes from a 1 mg hair-loss tablet.

07How the 1 mg tablet moves through plasma

Food does not move finasteride absorption. Take it with breakfast or at night. Pick a clock you will keep.

Mean oral bioavailability of the 1 mg tablet was 65% against an IV reference, range 26-170%, in 15 young men. Steady-state Cmax averaged 9.2 ng/mL (4.9-13.7) at 1 to 2 hours. AUC(0-24 h) was 53 ng·hr/mL.

Volume of distribution averaged 76 liters. About 90% is plasma-protein bound. Terminal half-life is about 4.5 hours in the IV set, 5-6 hours orally in men 18-60, and about 8 hours after 70.

Metabolites leave in urine (mean 39%) and feces (mean 57%). Renal impairment down to creatinine clearance 9 mL/min did not force a dose cut after a single labelled tracer dose. Fecal excretion rose as urinary metabolite exit fell.

Semen levels after 1 mg daily for 6 weeks were undetectable in 21 of 35 samples. The highest measured level was 1.52 ng/mL. The PI walks the vaginal-absorption arithmetic and still keeps the crushed-tablet rule for pregnancy. Those are different exposures.

08PSA math that fools a routine screen

Young-trial PSA fell from 0.7 ng/mL at baseline to 0.5 ng/mL at month 12 on 1 mg. That is a small absolute drop in a young cohort. The 5 mg BPH sheets still teach an approximate 50% PSA fall. Lab computers do not know which tablet the man swallowed.

Any confirmed rise from the lowest PSA on Propecia needs evaluation, even if the number still looks 'normal' for a man not on a 5-ARI. Non-adherence also scrambles the trend.

PCPT used Proscar 5 mg, not Propecia, in 18,882 men aged 55 and over with PSA of 3.0 ng/mL or less. Gleason 8-10 cancers: 1.8% on finasteride versus 1.1% on placebo. Dutasteride's REDUCE-type signal was 1% versus 0.5%. The Propecia PI says the meaning of that high-grade finding for 1 mg hair-loss use is unknown.

Tell the clinician who orders PSA that the tablet is on board. A doubled correction is a 5 mg habit in many prostate clinics. Do not apply it in silence to a 1 mg cosmetic chart.

Breast-cancer counts in PLESS, MTOPS, and PCPT do not settle a causal story. The PI still lists male breast cancer in post-marketing language. New breast lumps get examined, not blog-ranked.

09Year-1 sexual rates, not forum lore

Year-one sexual events beat placebo by small, labelled margins. Decreased libido 1.8% versus 1.3%. Erectile dysfunction 1.3% versus 0.7%. Ejaculation disorder 1.2% versus 0.7%, with decreased volume 0.8% versus 0.4%. Drug-related sexual discontinuations: 1.2% versus 0.9%.

Thirty-six of 945 men (3.8%) reported one or more of those sexual events versus 20 of 934 on placebo (2.1%). Most men who stayed on drug, and those who stopped, saw resolution in the trial write-up. By year 5 each listed event sat at 0.3% or less among remaining users.

A 48-week semen-volume study at 1 mg showed a median drop of 0.3 mL (-11%) versus 0.2 mL (-8%) on placebo. The 5 mg studies showed about 0.5 mL (-25%) and recovery after stop.

Post-marketing language now names persistent sexual symptoms after discontinuation, depression, and suicidal ideation. Those lines were added because reports accumulated, not because the Year-1 table grew. Counsel both layers. Sexual AE postscript keeps forum percentages off the chart.

Breast tenderness and testicular pain did not separate from placebo in the Propecia trials. They still appear in the counselling list because men report them later.

10Seal: hold the 1 mg lock or do not start

Seal this despatch on the 1 mg lock. Daily tablet, three-month wait, photos not vibes, PSA disclosed, crushed tablets kept from pregnancy, 5 mg left on the BPH shelf.

The 90-day generic board is the cash picture under this letter. GoodRx stays in the caption. Each pharmacy link is that chain only.

Questions after a read: [email protected]. We annotate. We do not ship tablets. Dated 21 August 2026, Stockholm.

Generic finasteride 1 mg, ninety tablets, the Juvia Propecia lock, August 2026. GoodRx lists the common 1 mg x 90 board at $183.24 average retail and $10.80 with a coupon. Proscar 5 mg is a different indication and NDC. Juvia does not dispense.