5 doctors weighed in:
How does nonoxynol-9 stop sperm?
5 doctors weighed in

Dr. George Klauber
Pediatrics - Urology
3 doctors agree
In brief: Sperm motility
N-9 present in most spermicidal compounds, many condoms and vaginal diaphrams.
It interferes with cell walls of sperm to make them non-motile. It is only 80-90% effective and thus 10-20% not effective.

In brief: Sperm motility
N-9 present in most spermicidal compounds, many condoms and vaginal diaphrams.
It interferes with cell walls of sperm to make them non-motile. It is only 80-90% effective and thus 10-20% not effective.
Dr. George Klauber
Dr. George Klauber
Thank
In brief: Kills
Kills sperm.
...A spermacide.

In brief: Kills
Kills sperm.
...A spermacide.
Dr. Richard Sarle
Dr. Richard Sarle
Thank
Read more answers from doctors