Vaginal pH Modulator
vs
Withdrawal
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 |  Vaginal pH ModulatorA prescription gel used before sex that keeps vaginal pH acidic to disable sperm. |  WithdrawalThe man withdraws his penis from the vagina before ejaculation to reduce the chance of sperm reaching the egg. |
|---|---|---|
| Efficacy | 86.3% typical use Least effective: under 90 out of 100 people successfully prevent pregnancy per year. | 80% typical use Least effective: under 90 out of 100 people successfully prevent pregnancy per year. |
| Cost | $0–$400 /per package Insurance: Usually | $0 Insurance: Varies |
| Duration | Single use (effective for 1 hour) | Per act |
| Reversibility | Reversible | Reversible |
| STI Protection | No | No |
| How it works | A gel containing lactic acid, citric acid, and potassium bitartrate maintains an acidic vaginal pH that disables sperm and reduces their motility. It also acts as a physical barrier to sperm movement. | The man withdraws his penis from the vagina before ejaculation to keep semen out of the vagina. Pre-ejaculate may contain some sperm, which is why perfect use is not 100%. A 2024 pilot study found sperm in about 13% of pre-ejaculate samples, though roughly 75% of participants had no sperm in any sample. |
| Prescription | Required Prescription required | OTC No prescription / OTC |
| Available Products | 1 product | No branded products yet |
| Side effects |
| None reported |
| Who shouldn't use this |
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