Copper IUDvsSpermicide

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 A small copper device placed in the uterus that works for up to 10 years and is over 99% effective.	Spermicide A chemical gel, foam, or film inserted into the vagina before sex to disable sperm, available over the counter.
Efficacy	99.2% typical use Most effective: over 99 out of 100 people successfully prevent pregnancy per year.	79% typical use Least effective: under 90 out of 100 people successfully prevent pregnancy per year.
Cost	$0–$1,424 Insurance: Usually	$1–$3 /per unit Insurance: Varies
Duration	Up to 10 years	Single use (effective for 1 hour; duration varies by formulation, check product label)
Reversibility	Reversible	Reversible
STI Protection	No	No
How it works	Releases copper ions into the uterus that make the environment toxic to sperm and may prevent implantation if fertilization occurs.	A chemical (usually nonoxynol-9) immobilizes or kills sperm on contact. Inserted into the vagina before sex.
Prescription	Required Prescription required	OTC Over-the-counter
Side effects	Heavier or longer periods (especially first few months) Increased cramping Spotting between periods Small risk of uterine perforation at insertion	Vaginal or penile irritation Increased risk of UTI Allergic reaction (rare)
Who shouldn't use this	Active pelvic infection or PID (FDA label) Uterine anomaly preventing insertion (FDA label) Wilson's disease (copper metabolism disorder) (FDA label) Known copper allergy (FDA label) Current pregnancy (FDA label)	Sensitivity to nonoxynol-9 Active vaginal irritation or infection High risk of HIV exposure (frequent use may increase transmission risk)

Key differences

Copper IUD is more effective (99.2% vs 79% typical use). Copper IUD duration: Up to 10 years. Spermicide duration: Single use (effective for 1 hour; duration varies by formulation, check product label). Copper IUD requires a prescription; Spermicide does not. Copper IUD: costs $0–$1,424. Spermicide: costs $1–$3 per unit.