Vaginal pH Modulator
vs
Vasectomy

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 Modulator

Vaginal pH Modulator

A prescription gel used before sex that keeps vaginal pH acidic to disable sperm.
Vasectomy

Vasectomy

A permanent outpatient procedure that blocks the vas deferens so sperm cannot enter the semen.
Efficacy86.3% typical use

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

99.85% typical use

Most effective: over 99 out of 100 people successfully prevent pregnancy per year.

Cost$0–$400 /per package

Insurance: Usually

$0–$3,500

Insurance: Usually

DurationSingle use (effective for 1 hour)Permanent
ReversibilityReversiblePermanent
STI ProtectionNoNo
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.

A clinician cuts, seals, or blocks the vas deferens so sperm cannot mix with semen during ejaculation. The body absorbs the sperm, and the semen remains normal in appearance and volume.

PrescriptionRequired Prescription requiredOTC Procedure (in-person)
Available Products1 productNo branded products yet
Side effects
  • Vaginal burning or irritation
  • Increased risk of urinary tract infection
  • Rare allergic reaction
  • Mild pain or swelling for a few days
  • Bruising or bleeding at the site
  • Sperm granuloma (small lump, usually harmless)
  • Chronic post-vasectomy pain syndrome (rare, 1-2%)
Who shouldn't use this
  • Active vaginal infection
  • Recurrent UTIs (use may increase risk)
  • Uncertainty about future fertility desires
  • Active local or systemic infection
  • Bleeding disorder