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Home » Advice & Support Services » Contraception Options » Types of Contraception » Diaphragm

Diaphragm Contraception

SUMMARY

Also known as “the cap”
A small, soft silicone dome that’s placed inside the vagina to cover the cervix.
Works as a barrier method of contraception to help prevent pregnancy.
Needs to be fitted by a nurse or doctor the first time to make sure the size and fit are right.

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How it works

Blocks sperm from reaching the egg.
Works more effectively when used with spermicide, which adds an extra layer of protection by stopping sperm from moving.

Effectiveness

With perfect use: 92-96% effective.
With typical use: 71-88% effective.
Starts working straight away once inserted correctly.

Advantages

Can be put in ahead of time, so it doesn’t interrupt sex.
Reusable, which can make it more cost-effective over time.
More effective when combined with spermicide.
Doesn’t affect your hormones, so it may suit people who prefer non-hormonal options.

Things to keep in mind

Needs to stay in place for at least 6 hours after sex.
Should be removed, washed, and dried within 24 hours before reusing.
Doesn’t provide protection against sexually transmitted infections (STIs).
Can take some practice to learn how to insert and remove correctly — a nurse or doctor can show you how.

Will anyone know I’m using it?

Someone else may be able to feel it during sex with fingers or a penis.
When not in use, its unique shape might make it recognisable if found in its case or packaging.

Could someone tamper with it?

Yes, it can be removed by another person.
May not be the best option if you don’t always have control over if, when, or how sex happens.

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