A birth control diaphragm prevents pregnancy by acting as a physical barrier between sperm and the cervix. This shallow, dome-shaped silicone cup fits inside the vagina and completely covers the cervix, blocking sperm from entering the uterus.
When used correctly with spermicide, a diaphragm is about 88% effective with typical use and up to 94% effective with perfect use. To work properly, it must be inserted before intercourse and left in place for at least 6 hours afterward.
What is a contraceptive diaphragm?
A contraceptive diaphragm is a reusable barrier birth control method made of soft silicone that looks like a small, flexible cup. You’ll need a prescription, and most diaphragms need a proper fitting from a healthcare provider to make sure it covers your cervix correctly. However, Caya® is an option that doesn’t require a fitting.
Unlike hormonal birth control methods, diaphragms don’t affect your cycle or hormone levels. They work by physically blocking sperm from reaching an egg.
How does it use spermicide to block sperm?
Spermicide is essential to the diaphragm’s effectiveness. It provides chemical protection in addition to the physical barrier. Here’s how it works:
- Apply spermicide cream or jelly inside the dome and around the rim before insertion.
- The spermicide immobilizes and kills sperm on contact.
- The diaphragm holds the spermicide in place against your cervix for maximum protection.
Without spermicide, the diaphragm’s effectiveness drops significantly.
Why are diaphragms not used anymore?
Diaphragms are still available, but their popularity has declined for a few reasons:
- They can feel less convenient than other modern birth control methods (like pills, IUDs, or implants).
- You need to insert the device before sex, apply spermicide, and wait at least 6 hours before removing it, which can disrupt spontaneity.
What risks are linked to diaphragm use?
While diaphragms are generally safe, they carry some risks:
- Higher risk of urinary tract infections (UTIs).
- Rare risk of toxic shock syndrome (TSS) if left in too long.
- Vaginal irritation or allergic reaction to spermicide or silicone.
- Increased STI risk since spermicides may irritate vaginal tissue.
What causes diaphragm failure?
Diaphragm failure usually happens because of incorrect use, not because of the device itself. Common causes include:
- Improper insertion that doesn’t fully cover the cervix.
- Using too little spermicide.
- Removing the diaphragm too soon after sex (you need to wait at least 6 hours).
- The device shifting out of place during vigorous sexual activity.
How to use a diaphragm for birth control?
Using a diaphragm takes a bit of preparation and practice. Here’s what to do:
- Check the device for holes or tears by holding it up to the light.
- Apply about a tablespoon of spermicide inside the dome and around the rim.
- Insert it into the vagina (up to 2 hours before sex).
- If more than 2 hours pass (or if you have sex again) add more spermicide.
How do I insert and remove a diaphragm?
Insertion steps:
- Wash your hands thoroughly.
- Fold the diaphragm in half with spermicide inside.
- Insert it deeply into the vagina like a tampon.
- Push the front rim up behind your pubic bone.
- Feel through the silicone to check that your cervix is fully covered.
Removal steps:
- Wait at least 6 hours after sex.
- Hook your finger under the front rim.
- Gently pull it down and out.
Can a man feel the contraceptive diaphragm?
Most men cannot feel a properly fitted and positioned diaphragm during sex. Since the device sits deep in the vagina against the cervix, it’s usually out of range.
Some partners may occasionally notice the rim during deep penetration, but this is uncommon.
How to solve birth control needs with Nurx
Finding the right birth control doesn’t have to be complicated. Nurx makes it simple to explore your options and get personalized recommendations from licensed healthcare providers.
Whether you’re curious about barrier methods, hormonal birth control, or long-acting reversible contraception, Nurx offers convenient online consultations, access to over 50 birth control options, and fast, discreet home delivery for your needs.
Start your birth control consultation with Nurx today to discover which method best fits your lifestyle and health needs. We’ll help you understand how diaphragms prevent pregnancy and whether this option is a good idea for you or not.
The information provided is not a substitute for professional medical advice, diagnosis, or treatment. You should not rely upon this content for medical advice. If you have any questions or concerns, please talk to a medical professional.
Services not offered in every state. Medications prescribed only if clinically appropriate, based on completion of the required consultation. Individual results may vary.
Not all options discussed in the blog are available through Nurx. Please see Nurx.com for details.