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Spermicide vs Vasectomy

A side-by-side comparison of two birth control methods — efficacy, cost, how they work, and who shouldn't use them.

Last verified October 11, 2026Updated October 11, 2026

Side-by-side comparison

Spermicide A chemical gel, foam, or film inserted into the vagina before sex to disable sperm, available over the counter.
Vasectomy A permanent outpatient procedure that blocks the vas deferens so sperm cannot enter the semen.

Method	Spermicide A chemical gel, foam, or film inserted into the vagina before sex to disable sperm, available over the counter.	Vasectomy A permanent outpatient procedure that blocks the vas deferens so sperm cannot enter the semen.
Efficacy	Spermicide 79% typical use Least effective: under 90 out of 100 people successfully prevent pregnancy per year.	Vasectomy 99.85% typical use Most effective: over 99 out of 100 people successfully prevent pregnancy per year.
Cost	Spermicide $16–$18 per package Insurance: Varies	Vasectomy $0–$1,000 Insurance: Varies
Duration	Spermicide Single use, one dose before each act of sex (gel works for up to 1 hour; film goes in 15 minutes to 3 hours before sex)	Vasectomy Permanent
Reversibility	Spermicide Reversible	Vasectomy Permanent
STI protection	Spermicide No	Vasectomy No
How it works	Spermicide A chemical (usually nonoxynol-9) immobilizes or kills sperm on contact. Inserted into the vagina before sex.	Vasectomy 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	Spermicide Not required Over-the-Counter	Vasectomy Required In-Person Procedure
Side effects	Spermicide Vaginal or penile irritation Increased risk of UTI Allergic reaction	Vasectomy Mild pain or swelling for a few days Bruising or bleeding at the site Sperm granuloma (swelling from leaked sperm that usually goes away on its own) Chronic post-vasectomy pain syndrome (5% in a 2020 meta-analysis)
Who shouldn't use this	Spermicide Sensitivity to nonoxynol-9 High risk of HIV exposure, or HIV in you or a partner (frequent use may increase transmission risk)	Vasectomy Uncertainty about future fertility desires Known allergy or hypersensitivity to materials used in the procedure

Key differences

With typical use, 21 in 100 people using Spermicide get pregnant in a year, vs 0.2 in 100 with Vasectomy (least effective vs most effective). How long it lasts: Spermicide, single use, one dose before each act of sex (gel works for up to 1 hour; film goes in 15 minutes to 3 hours before sex); Vasectomy, permanent. Spermicide: reversible. Vasectomy: permanent. A prescription is needed for Vasectomy, not for Spermicide. Spermicide: costs $16–$18 per package. Vasectomy: costs $0–$1,000.