SpongevsVasectomy

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	Sponge A soft foam disc placed deep in the vagina before sex. It covers the cervix and contains spermicide.	Vasectomy A permanent outpatient procedure that blocks the vas deferens so sperm cannot enter the semen.
Efficacy	Least effective see details 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	$15–$20 /per package Insurance: No	$0–$3,500 Insurance: Usually
Duration	Single use (can be left in place up to 24 hours and for multiple acts of sex)	Permanent
Reversibility	Reversible	Permanent
STI Protection	No	No
How it works	A polyurethane foam disc impregnated with spermicide is placed over the cervix before sex. The spermicide kills or disables sperm and the physical barrier blocks sperm from entering the uterus.	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.
Prescription	OTC No prescription / OTC	OTC Procedure (in-person)
Side effects	Vaginal irritation or dryness 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	Allergy to nonoxynol-9, benzalkonium chloride, or other spermicide ingredients History of toxic shock syndrome Active vaginal infection Inability to insert or remove reliably High risk of HIV exposure (frequent nonoxynol-9 use may increase vaginal irritation; CDC cautions)	Uncertainty about future fertility desires Active local or systemic infection Bleeding disorder

Key differences

Sponge duration: Single use (can be left in place up to 24 hours and for multiple acts of sex). Vasectomy duration: Permanent. Sponge is reversible; Vasectomy is permanent. Sponge: costs $15–$20 per package. Vasectomy: costs $0–$3,500.