Cervical Cap
vs
Copper IUD

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.
Copper IUD

Copper IUD

A small copper device placed in the uterus that works for up to 10 years and is over 99% effective.
EfficacyLeast effective see details

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

99.2% typical use

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

Cost$90–$120

Insurance: Usually

$0–$1,424

Insurance: Usually

DurationReusable for 2 years (replace every 2 years or sooner if damaged)Up to 10 years
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.

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

PrescriptionRequired Prescription requiredRequired Prescription required
Available Products1 product5 products
Side effects
  • Vaginal irritation from spermicide
  • Discomfort if not fitted correctly
  • Unusual vaginal discharge if left in too long
  • Heavier or longer periods (especially first few months)
  • Increased cramping
  • Spotting between periods
  • Small risk of uterine perforation at insertion
Who shouldn't use this
  • Cervical anomaly preventing fit
  • Active pelvic infection
  • Sensitivity to silicone or spermicide
  • Inability to insert or remove reliably
  • 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)