Copper IUD
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
Copper IUD

Copper IUD

A small copper device placed in the uterus that works for up to 10 years and is over 99% effective.
Vaginal pH Modulator

Vaginal pH Modulator

A prescription gel used before sex that keeps vaginal pH acidic to disable sperm.
Efficacy99.2% typical use

Most effective: over 99 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$0–$1,424

Insurance: Usually

$0–$400 /per package

Insurance: Usually

DurationUp to 10 yearsSingle use (effective for 1 hour)
ReversibilityReversibleReversible
STI ProtectionNoNo
How it works

Releases copper ions into the uterus that make the environment toxic to sperm and may prevent implantation if fertilization occurs.

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 Products5 products1 product
Side effects
  • Heavier or longer periods (especially first few months)
  • Increased cramping
  • Spotting between periods
  • Small risk of uterine perforation at insertion
  • Vaginal burning or irritation
  • Increased risk of urinary tract infection
  • Rare allergic reaction
Who shouldn't use this
  • Active pelvic infection or PID (FDA label Category 4)
  • Uterine anomaly preventing insertion (FDA label Category 4)
  • Wilson's disease (copper metabolism disorder) (FDA label Category 4)
  • Known copper allergy (FDA label Category 4)
  • Current pregnancy (FDA label Category 4)
  • Active vaginal infection
  • Recurrent UTIs (use may increase risk)