|
Yes, a diaphragm user should insert a new dose of spermicide before each episode of intercourse. A woman should insert a new dose of spermicide if intercourse takes place six hours or more after diaphragm insertion.
|
No research has been done to compare diaphragm users who insert more spermicide before a second episode of intercourse, and those who do not. Nonoxynol-9 (N-9) spermicide may retain its contraceptive effect for more than a day inside a cervical cap, and for 12 hours inside a diaphragm, but the impact of multiple ejaculations on N-9 potency is not known. In the absence of concrete data, it is prudent to insert a new dose of spermicide for each intercourse.
- Leitch WS. Longevity of Gynol II and Ortho Creme in the Prentif cervical cap. Contraception 1986;34(4):363-79.
- Leitch WS. Longevity of Ortho Creme and Gynol II in the contraceptive diaphragm. Contraception 1986;34(4):381-93.
- Hatcher RA, Trussell J, Stewart F, Stewart GK, Kowal D, Guest F, et al. The diaphragm, contraceptive sponge, cervical cap and female condom. In: Contraceptive Technology. New York: Irvington Publishers, 1994:191-222.
|
