Who can use diaphragms and caps? 

Most women are able to use a diaphragm. However, they may not be suitable for you if you: 

• have an unusually shaped or positioned cervix (entrance to the womb), or if you cannot reach your cervix  
• have weakened vaginal muscles (possibly as a result of giving birth) that cannot hold a diaphragm in place 
• have ever had toxic shock syndrome 
• have repeated urinary tract infections 
• currently have a vaginal infection (wait until your infection clears before using a diaphragm or cap)  

Research shows that spermicides which contain the chemical nonoxynol-9 do not protect against STIs and may even increase your risk of getting an infection.

A diaphragm may be less effective if:

• it is damaged – for example, it is torn or has holes  
• it is not the right size for you 
• you use it without spermicide  
• 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, moisturiser or some vaginal medicines (for example, pessaries) with latex diaphragms – these can damage the latex 

If any of these things happen, or you have had sex without contraception, you may need to use emergency contraception.

After having a baby

If you have had a baby you may need a different size diaphragm or cap. It is recommended that you wait 6 weeks after having a baby before using a diaphragm or cap. 

After a miscarriage or abortion

You can use a diaphragm or cap after a miscarriage or abortion.  Check with a doctor or nurse as you may need a different size.  

Advantages and Disadvantages

Advantages

• They can be put in before sex but you must use extra spermicide if you have put it in more than 3 hours before
• They are not affected by any medicines
• They don’t affect your menstrual cycle

Disadvantages

• They can take some time getting used to
• They aren’t’ as effective as some other contraceptive methods
• Some people may be sensitive to latex or the chemical used in spermicide