Cervical Cap
vs
Vaginal pH Modulator

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 Cap

Cervical Cap

A small silicone cap that fits over the cervix by suction, used with spermicide before sex.
Vaginal pH Modulator

Vaginal pH Modulator

A prescription gel used before sex that keeps vaginal pH acidic to disable sperm.
EfficacyLeast effective see details

Least effective: under 90 out of 100 people successfully prevent pregnancy per year.

86.3% typical use

Least effective: under 90 out of 100 people successfully prevent pregnancy per year.

Cost$90–$120

Insurance: Usually

$0–$400 /per package

Insurance: Usually

DurationReusable for 2 years (replace every 2 years or sooner if damaged)Single use (effective for 1 hour)
ReversibilityReversibleReversible
STI ProtectionNoNo
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 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.

PrescriptionRequired Prescription requiredRequired Prescription required
Available Products1 product1 product
Side effects
  • Vaginal irritation from spermicide
  • Discomfort if not fitted correctly
  • Unusual vaginal discharge if left in too long
  • Vaginal burning or irritation
  • Increased risk of urinary tract infection
  • Rare allergic reaction
Who shouldn't use this
  • Cervical anomaly preventing fit
  • Active pelvic infection
  • Sensitivity to silicone or spermicide
  • Inability to insert or remove reliably
  • Active vaginal infection
  • Recurrent UTIs (use may increase risk)