Are contraceptive gels effective and protect against STIs?

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There are two main categories of vaginal gels used for contraception. Spermicide-based gels (traditional) contain Nonoxynol-9, a chemical that kills or disables sperm. For example, Nonoxynol-9 vaginal gel preparations. Frequent use may irritate vaginal tissue, increasing the risk of infection and possibly human immunodeficiency virus (HIV) and sexually transmitted infection (STI) if exposed.

pH-modulating (new generation) gels, for example, lactic acid, citric acid, and potassium bitartrate vaginal gel, keep the vagina acidic (natural pH ≈ 3.5 to 4.5), which immobilizes sperm so they cannot reach the egg. These are non-hormonal, non-spermicidal, and prescription-free in some regions (available over the counter (OTC) in others).

Lactic acid, citric acid, and potassium bitartrate vaginal gel (pH gel) has approximately 93 percent perfect use and around 86 percent typical use when applied correctly. However, it is less effective than condoms or an intrauterine device (IUD).

Spermicide (Nonoxynol-9) has about 94 percent perfect use and around 79 percent typical use; it must be applied before every act and may cause irritation. Male condoms have 98 percent perfect use and 87 percent typical use; they also protect against sexually transmitted infections. Copper intrauterine device (non-hormonal) has more than 99 percent perfect and for typical use, long-term (10 to 12 years), but requires clinician placement.

Gels are moderately effective, similar to condoms with typical use. For maximum protection, many couples combine gel and a condom, which increases effectiveness and provides protection against sexually transmitted infections (STIs).

For lactic acid, citric acid, and potassium bitartrate vaginal gel (pH gel), apply up to one hour before intercourse (best right before sex). It is effective immediately after application and remains effective for one hour; if more than one hour passes before sex, reapply. Must be reapplied before each act of intercourse (even within the same session). Spermicides are usually inserted 10 to 15 minutes before sex, are effective for one hour, and need reapplication for repeat acts.

Most users describe minimal sensation difference; some partners report a slight “cool” or lubricated feeling. It can make sex feel smoother, as it also acts as a lubricant. It is not messy when applied correctly and has a texture similar to vaginal moisturizer. Lactic acid, citric acid, and potassium bitartrate vaginal gel are designed to support natural vaginal acidity, which may help maintain healthy flora. Spermicides (Nonoxynol-9) can disrupt vaginal flora, leading to irritation or increased risk of bacterial vaginosis or yeast infection if used frequently.

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