Diaphragms and caps have the following disadvantages:
- they are not as effective as other types of contraception
- they only provide limited protection against sexually transmitted infections (STIs)
- it can take time to learn how to use them
- putting them in can interrupt sex
- cystitis (bladder infection) can be a problem for some women who use them
- latex and spermicide can cause irritation in some women and their sexual partners
What can make a diaphragm or cap less effective?
A diaphragm or cap will be less effective if:
- it is damaged – for example, it is torn or has holes
- you do not use it every time you have sex
- it does not cover your cervix
- it is not the right size
- you use it without spermicide
- you have sex three hours or more after you put it in and you do not use extra spermicide
- you do not use extra spermicide with your diaphragm or cap every time you have more sex
- you remove it too soon (less than six hours after the last time you had sex)
- you use oil-based products, such as baby lotion, bath oils or some vaginal medicines (for example, pessaries) with latex diaphragms or caps – these can damage the latex
If any of these things happen, or you have had sex without contraception, you may need to take emergency contraception.
