One milligram still sits on a sexual-AE table
Men hear 'it's only 1 mg' and skip the leaflet. The Propecia table is built at 1 mg. The percents are low. They are not zero.
Discontinuation for drug-related sexual events in that year-1 hair study was 1.2 percent on finasteride and 0.9 percent on placebo. Most men stay on 1 mg. A few should not be talked out of a stop.
Bag literacy is 1 mg versus 5 mg. Mechanism and PSA sit on the finasteride frame.
The year-1 table is 1 mg. 'Too small for sexual AEs' is a sentence you can push back on with 1.8 versus 1.3, 1.3 versus 0.7, and 1.2 versus 0.7.
Severe mood or a breast lump jumps the hair queue. Do not wait six weeks for dermatology.
Trying to conceive needs a dated hold plan before a semen test, not a three-day pause and a hopeful sample.
A leftover PDE5 in the same fortnight as 1 mg muddies both stories. Name both or start neither.
If you are trying to conceive on 1 mg
Say so now. Decreased volume is in the 1 mg table. Postmarketing semen-quality notes exist. A fertility clinic will want the start date and whether you will hold 1 mg.
Do not stop-start 1 mg around ovulation without a written plan. Hair and semen attribution both die.
Partners who are pregnant still need the crushed-tablet sentence. Sexual-AE talk does not retire handling.
A semen analysis off 1 mg needs enough weeks to mean something. Ask how many. Do not test on week one of a hold and call it proof.
If ED is the only new fact and conception is the goal, a PDE5 may be discussed - named, not leftover.
Postmarketing persistence - what we can say
After approval, reports include sexual dysfunction that continued after discontinuation - erectile, libido, ejaculation, and orgasm complaints - plus male infertility or poor semen quality that sometimes improved after stop, testicular pain, depression, and breast changes.
Those reports come from a population of unknown size. They do not give a clean percent. They are why a man who is miserable at month two should be heard, not told he is inventing a 1 mg problem.
Do not use this paragraph to diagnose a named internet syndrome. Use it to justify a clinic conversation and a dated stop if that is the joint decision.
What year 1 actually published
Decreased libido 1.8 percent versus 1.3. Erectile dysfunction 1.3 versus 0.7. Ejaculation disorder 1.2 versus 0.7, with decreased volume the usual detail.
Those are drug-related counts in a 945-versus-934 comparison. They are not 'half of users'. They are also not 'placebo-only stories'.
On 5 mg prostate studies, new sexual reports did not climb with longer use; new reports fell over time. That 5 mg sentence is not a promise that a 1 mg AE will vanish if you wait it out without telling anyone.
| Year-1 hair trial | Finasteride 1 mg | Placebo |
|---|---|---|
| Decreased libido | 1.8% | 1.3% |
| Erectile dysfunction | 1.3% | 0.7% |
| Ejaculation disorder | 1.2% | 0.7% |
What else looks like a 1 mg sexual AE
New SSRI, new spironolactone in a partnered household mix-up, heavy alcohol, relationship strain, and untreated sleep apnea all cut libido. A diary that starts the week 1 mg starts still helps - it does not prove causation by itself.
PDE5 use for ED that began after 1 mg is a common pairing. That is a chart fact, not a reason to add tadalafil 10 mg without saying finasteride out loud.
Jumping from 1 mg to 5 mg because hair is slow will not fix a sexual AE. It is the wrong licence and more exposure.
Tenderness is a same-week call at 1 mg too
Breast enlargement and tenderness are more famous on 5 mg and still counted at 1 mg. Lumps or discharge: prompt, not the next hair slot.
Unilateral change matters more than 'both feel a bit sore'.
Do not start a hormone cream from the internet to flatten a 1 mg breast effect.
Gynecomastia talk is a stop-or-continue decision with the clinician, not a forum poll.
Photograph only if they ask. Bring the 1 mg blister so nobody assumes 5 mg.
A sixty-second AE speech that names 1 mg
I take finasteride 1 mg for hair since [date]. Since [week] I have [libido / ED / volume / mood / breast]. I want to [stay / hold / stop]. Please record it.
That speech is enough. Do not apologise for a 1.8 percent table. Your body is not a percent.
Bring the blister. They need to see 1 mg, not hear Propecia and think 5 mg.
If you already started a leftover PDE5, say so in the same sixty seconds.
If a partner is pregnant or trying, add the handling sentence in the same minute.
Severe mood or a breast lump jumps the queue. Do not wait for the hair slot.
Write the speech before the visit. Anxiety deletes milligrams.
Ask them to add the AE to the record even if you stay on 1 mg. Future you needs the date.
Do not accept 'it is too small a dose for that'. The table was built at 1 mg.
How to talk about 1 mg without minimising
Name the three trial events and the small placebo gaps. Name the postmarketing persistence reports. Ask the man what he wants to do if symptoms appear - hold, continue with a date to review, or stop.
Partners deserve the pregnancy-handling sentence even when the sexual-AE talk is the reason they opened the page.
Do not promise that stopping 1 mg restores everything in two weeks. Some reports improved. Some did not, in uncontrolled data.
What to bring if 1 mg feels wrong
Start date, exact 1 mg manufacturer, libido/ED/volume notes by week, mood, breast symptoms, other new drugs.
A two-week hold only if the clinician agrees - unplanned holds confuse hair and AE attribution.
If ED is the only new fact and hair still matters, a PDE5 discussion can sit beside a 1 mg continue. That is not a glint prescription.
- Do not silently add 5 mg.
- Do not silently add a friend's Cialis.
- Do report breast change and severe mood drop the same week.
Week-two flatness on 1 mg is a dated note
Postmarketing lists depression. A new flatness two weeks after 1 mg starts deserves a line in the record, even if you stay on the tablet for now.
Severe mood drop or suicidal thinking is a hold and urgent care, not a 'finish the month for the photos'.
Other new drugs in the same fortnight confound the story. Write them.
Partners notice withdrawal from sex and from conversation. Both belong in the sixty-second GP speech.
Do not add an SSRI from a friend to 'cover' a 1 mg mood change. Two sexual-AE drugs at once.
Small percents still get a named appointment
Stay on 1 mg if you are well and want the hair indication. Hold and call if sexual, mood, or breast changes arrive and you want them on the record.
Confirm any stop or add-on with the prescriber. This page does not taper you off 1 mg by email.
Small percents still get a named appointment. Stay on 1 mg if you are well. Hold and call if sexual, mood, or breast changes arrive and you want them dated.
Push back on 'too small a dose'. The table was built at 1 mg. Bring the blister so nobody hears Propecia and writes 5 mg.
Conception plans and semen tests need weeks, not a three-day hold. Severe mood or a unilateral lump jumps the hair queue.
A gym 'PCT stack' that adds 1 mg to anabolics is not this licence. Tell the GP the stack. Stopping 1 mg does not clean a steroid month.
Breast tenderness plus a lump is a same-week exam, not a 'wait for month 12 photos'. Gynecomastia sits in the label at 1 mg. Photograph if they ask later.
A PSA drawn while you still swallow 1 mg needs that fact on the form. Stopping 1 mg for two days before the blood does not reset the enzyme story.
Sources
Checked against the current label and reviewed by Dr. Mira Okonkwo. See Capture → Layer → Peer-blur → Publish.