Appendix: Results of online polls on side effects

This is an Appendix to the post: Polls vs. official data on side effect rates.

Questions, results and standardized results are provided below for each of the 10 included polls.

ID & sourceDate postedParticipants% with side effects% with severe or persistent side effects
P1. HaarWeb.nlMar 200455655.4%NA [1]
P2. r/tresslessJan 201614653.4%NA
P3. HairLossTalk forumAug 20175048.0%NA
P4. Hair Restoration Social NetworkFeb 201910735.7%NA
P5. r/HairLossJul 202111027.3%NA
P6. r/MorePlatesMoreDatesAug 20216547.7%18.5%
P7. r/HairLossSep 20215729.8%NA
P8. r/HairLossResearchFeb 202220849.5%12.5%
P9. r/MorePlatesMoreDatesJul 202216348.5%19.6%
P10. r/HairTransplantsSep 202210533.3%NA
Table 1. Results of nine included polls. Polls appear in chronological order. Polls with the r/ prefix are Reddit forums. Three polls included responses for severe and/or persistent side effects as shown in the right column (P5, P7 & P8). Full results are in an Appendix.
Note 1. 24.1% of respondents in P1 indicated side effects leading them to stop the medication, but these have not been counted as severe or persistent.

P1. • March 18, 2004

Translated from Dutch.

[In finasteride forum] Side effects?

No, didn’t suffer from/never noticed anything.24844.6%
Yes, but not the kind that made me stop taking it.17431.3%
Yes, that’s why I don’t use it anymore.13424.1%

Standardized results:


Source (Archived)

P2. r/tressless on Reddit • Jan 16, 2016

“Do/did you have Finasteride side effects?”

No, just no. ZERO side effects.6831.0%
I have avoided Finasteride due to Fear/other reasons7333.0%

Standardized results:


Sources: Data at pollcodeOriginal Reddit post (Archived: Poll dataImage of deleted Reddit post)

P3. HairLossTalk • Aug 28, 2017

“If you take Finasteride did you get sides?


Source (Archived)

P4. Hair Restoration Social Network • Feb 8, 2019

“In your opinion, have you experienced side effects from finasteride?”

I have never taken finasteride, therefore I cannot answer.2014.3%

Standardized results:


Source (Archived)

P5. r/HairLoss on Reddit • Jul 29, 2021

“To those who have taken fin, did you get side effects?”

Negative side effect3027.3%

Source (Archived: postpoll)

P6. r/MorePlatesMoreDates on Reddit • Aug 26, 2021

What is your experience with Finasteride?”

Used it with no side effects3412.9%
Used it with mild side effects (e.g. reduction in erection quality / libido)197.2%
Used it with severe side effects (e.g. brain fog, depression, ED, gyno)124.6%
Never used it19875.3%

Standardized results:

Any side effects3147.7%
Severe side effects1218.5%

Source (Archived: postpoll)

P7. r/HairLoss on Reddit • Sep 11, 2021

“A poll on the side effects and efficacy of Finasteride.”

Haven’t experienced any side effects.3531.8%
Experienced side effects.1715.5%
Fin didn’t work for me.54.5%
I haven’t used Fin.5348.2%

Standardized results:

Any side effects1729.8%
No side effects4070.2%

Source deleted; see screenshot

P8. r/HairlossResearch on Reddit • Feb 5, 2022

“If you are currently on oral finastride, please select on option below:” [sic]

No side effects10550.5%
Side effects that went away3114.9%
Side effects that haven’t gone away in a few months2612.5%
Minor side effects I can live with4622.1%

Standardized results:

Any side effects10349.5%
Persistent side effects2612.5%

Source (Archived: postpoll)

P9. r/MorePlatesMoreDates on Reddit • Jul 13, 2022

Finasteride Side Effect Poll

No side effects at all8451.5%
Small Side effects3722.7%
Sides went away after stopping Fin106.1%
Heavy side effects1811.0%
I have PFS148.6%

Standardized results:

No side effects8451.5%
Any side effects7948.5%
– Mild/transient4728.8%
– Severe1811.0%
– Post-discontinuation148.6%

Source (Archived: postpoll)

P10. r/HairTransplants on Reddit • Sep 22, 2022

“Did you get side effects from using finasteride (oral or topical)? I’m curious about real world usage. Thanks!

Not sure38
Total Yes or No responses105

Source (Archived: postpoll)