A diaphragm is a silicone disc that is cupped on one side like saucer. You put a little bit of spermicidal gel or cream in the cupped side. Then you fold it in half and insert it high up in your vagina (cup side in) so that when it opens, it sits just under the cervix. The diaphragm blocks sperm from getting near the cervix.
The spermicide has chemicals that stop sperm from moving. If sperm do make it around the barrier, the spermicide will make sure they don’t go any further.
Most diaphragms come in multiple size because people come in multiple size. You want the diaphragm to fit snuggly in you pelvis under your cervix with no room around it for sperm to get by. This means that you have to be fitted by a health care provider. The provider will give you a prescription for the correct size which you can fill at a pharmacy. A diaphragm can last for about two years, but if you gain or lose 10 or more pounds, or you have a baby, you need to be fitted again because your size may have changed.
Diaphragms should be covered by insurance. If you don’t have insurance, a diaphragm will cost somewhere between $85 and $250. The spermicide is available over the counter and costs around $10 or $15, but one kit (a tube of gel and an applicator) should last awhile.
You can put your diaphragm in before you have sex but if it’s been more than a few hours, you should add more spermicide inside the vagina. You should also add spermicide inside the vagina each time you have sex that day. Do not take out your diaphragm to do this, instead use an applicator like the one you might use with yeast infection medication.
You have to leave your diaphragm in for about 6 hours after sex to make sure that the spermicide has done its job. Keep in mind you can only leave the diaphragm in for 24 hours total, so you have to do some math to figure out when you to stop having sex.
When you’re ready to remove it, you can use your finger to grab the edge and pull it out. Wash it gently with soap and water and put it away for the next time.
Diaphragms are 94% effective if used correctly every time but only 83% effective in real life situations. That’s because there are a lot of steps to using a diaphragm, and people sometimes make mistakes. The most common mistake is not using it every time you have sex.
The cervical cap is a silicone cup. It is smaller than a diaphragm and meant to more directly cover the cervix. There is only one brand of cervical cap on the market in the U.S. right now. It’s called FemCap, and is available in three sizes. Which size you need—and how well it works—depends on your reproductive history because pregnancy and delivery changes the shape of your cervix.
The small size is for people who have never been pregnant. The medium size is for people who have been pregnant but didn’t have a full-term vaginal birth because they had a miscarriage, an abortion, or delivered via C-section. The large size is for people who had one or more vaginal births.
You need a prescription for FemCap, but because the sizes are based on your history and not your body, telehealth works just as well as an in-person visit. Once you have the prescription, you can get the cervical cap through the company’s website. The cervical cap should be covered by insurance and available at no-cost to you. If you don’t have insurance, it will cost $110. Cervical caps have to be used with spermicide that usually cost about $10 to $15 dollars for a tube and an applicator.
To use a cervical cap, you put a dime-size dollop of spermicide on the inside, a little more on the outside, and spread some to cover the rim. Then you insert it, cup side in and push it all the way up, so that it’s covering your cervix. You can put it in ahead of time and leave it in for up to 48 hours. If you have penis-in-vagina sex more than once, you should add spermicide to the vagina with an applicator every time. Do not take the cap out to do this.
Wait 6 hours after the last time you had sex and then take the cap out by hooking your finger through the removal strap and pulling down. Wash it carefully and put it away for the next time.
If you’ve never had a full-term vaginal delivery, the cervical cap is about 86% effective under typical conditions. If you have had one or more full-term vaginal deliveries, the cervical cap is only about 71% effective. People who have had vaginal deliveries may want to choose a different method.
Phexxi is relatively new to the market. It was approved by the FDA in 2020. Phexxi is a birth control gel, but it’s not like the over-the-counter spermicide you would use with your diaphragm or cervical cap.
It is made from all natural ingredients including lactic acid, citric acid, and potassium bitartrate (also known as cream of tartar). Phexxi comes in pre-filled applicators that you insert into the vagina right before you have sex.
Phexxi works by keeping the pH in the vagina too acidic for sperm to survive. You have to put a new applicator of Phexxi into the vagina every time you have sex. If it’s been an hour or more since you inserted the gel and you haven’t had sex yet, you need to put a new applicatorful in before you do.
If you use Phexxi perfectly, it’s 93% effective. In real life situations, however, it’s been found to be about 86% effective.
Phexxi is only available with a prescription. If you have insurance, it may be free. For people without insurance, it costs $389 for a box of 12 pre-filled applicators. The manufacturer offers a discount program that may make it less expensive.