Cervical Cap
vs
Diaphragm
A side-by-side comparison of two birth control methods — efficacy, cost, how they work, and who shouldn't use them.
Side-by-side comparison
| Method |  Cervical CapA small silicone cap that fits over the cervix by suction, used with spermicide before sex. |  DiaphragmA reusable silicone dome that covers the cervix to block sperm, used with spermicide each time you have sex. |
|---|---|---|
| Efficacy | Least effective see details Least effective: under 90 out of 100 people successfully prevent pregnancy per year. | 83% typical use Least effective: under 90 out of 100 people successfully prevent pregnancy per year. |
| Cost | $90–$120 Insurance: Usually | $80–$200 Insurance: Usually |
| Duration | Reusable for 2 years (replace every 2 years or sooner if damaged) | Reusable for 1-2 years (replace every 1-2 years or sooner if damaged) |
| Reversibility | Reversible | Reversible |
| STI Protection | No | No |
| How it works | A small silicone cap fits snugly over the cervix and stays in place by suction, blocking sperm from entering the uterus. Used with spermicide inside the cap. | A reusable silicone dome covers the cervix to block sperm from entering the uterus. Used with spermicide for added effectiveness. |
| Prescription | Required Prescription required | Required Prescription required |
| Available Products | 1 product | 2 products |
| Side effects |
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| Who shouldn't use this |
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