Spermicide
72% effective, One time use
Multiple kinds
A liquid, foam or strip that stops sperm from moving to prevent fertilization. You can buy spermicide at a drug store. Read more.
Spermicide does not protect against HIV or STDs. Always use a condom.
Side effect may include vaginal irritation. Nonoxynol-9 (the most common spermicide) may increase the risk of HIV and other STDs.
Effectiveness based upon typical use.