Spermicides are products that, placed in the vagina, inactivate sperm. Used alone, they are not a poorly effective method of contraception. Also, it is better to associate them with a diaphragm or a condom. 

Spermicides, by virtue of their chemical properties, destroy the cell membrane of spermatozoa which decreases their movement and their ability to fertilize. They also obstruct the cervix by forming a mucous plug. 

They exist in different forms: egg, gel or sponge. They cost between 7 and 16 euros for several doses and are not reimbursed.

Spermicides should be applied deep in the vagina before sex. Spermicides in the form of gel or ovum should be put in a few minutes before each intercourse. The spermicidal sponge has a duration of action of 24 hours. It can be placed well before sexual intercourse and kept for several hours afterwards. 

Soap should not be used before or within 6 hours of intercourse because the soap is an active spermicidal principle. An external toilet is only possible with pure water or with a specific toilet bar. Baths should be avoided in the hours following intercourse with spermicides. 

Spermicides should not be used in conjunction with other vaginal egg treatments. 

Spermicides have the advantage of being over-the-counter in pharmacies. But they cannot constitute long-term contraception. It is more of a backup contraception. Indeed, their contraceptive effectiveness is not very good. The effectiveness of spermicides alone is lower than that of the condom and the diaphragm. It is better to combine them with a barrier method: diaphragm, condoms. 

The effectiveness of spermicides alone is lower than that of a condom and a diaphragm. In addition, their contraceptive effect is short-lived, except for the sponge. 

Spermicides can cause local irritation in both partners. And, the most important thing to consider is that spermicides do not offer protection against sexually transmitted diseases. 

The diaphragm is a barrier device that covers the cervix and part of the vaginal wall. It helps prevent pregnancy by preventing sperm from entering the uterus. It is advisable to use the diaphragms with a spermicidal gel to increase its effectiveness.