HIV prevention involves condoms, PrEP, PEP and antiretroviral treatment
Preventing human immunodeficiency virus involves a combination of testing to determine status, barrier methods like condoms and dental dams, and antiretroviral regimens including pre-exposure prophylaxis and post-exposure prophylaxis.
- Pre-exposure prophylaxis prevents sexually transmitted HIV up to 99 percent effective use when taken correctly.
- Post-exposure prophylaxis requires initiation within 72 hours of a potential exposure and must be taken consistently for 28 days.
- Undetectable viral loads achieved through consistent antiretroviral treatment prevent transmission to sexual partners under the principle of undetectable equals untransmittable.
Condoms and Dental Dams Block HIV Transmission
Condoms remain a primary mechanical defense against HIV transmission by blocking the exchange of infectious bodily fluids such as semen, blood, and vaginal secretions. External latex and polyurethane condoms establish an effective barrier when applied before genital contact and worn continuously. Internal pouches inserted into the vagina or rectum offer comparable protection for receptive partners. Dental dams, originally designed for oral surgery, and makeshift squares cut from latex or kitchen plastic wrap block viral transmission during oral sex, although oral transmission remains statistically unlikely.
Prophylactic Medications Prevent HIV Acquisition
Pre-exposure prophylaxis utilizes daily oral medications or long-acting injections to prevent HIV acquisition in individuals who test negative for the virus. Clinical data show that these prophylactic regimens achieve up to 99 percent efficacy for sexual transmission and approximately 74 percent efficacy for injection drug use. The Food and Drug Administration approved lenacapavir as an injectable pre-exposure prophylaxis option administered twice yearly, expanding clinical choices beyond daily oral pills. When individuals suspect a recent exposure through unprotected intercourse, needle-stick injuries, or assault, post-exposure prophylaxis offers an emergency pharmacological intervention. This protocol demands initiation within 72 hours of exposure and strict adherence to a 28-day course to stop viral replication, frequently accompanied by temporary side effects like nausea and fatigue managed with over-the-counter remedies.
Antiretroviral Treatment Eliminates Risk of Passing HIV
Antiretroviral treatment suppresses viral replication in individuals living with HIV, reducing viral levels in the blood until tests detect no active virus. This clinical milestone, known as undetectable equals untransmittable, ensures that individuals maintain healthy immune systems while eliminating the risk of passing the virus to sexual partners. Regular diagnostic testing remains the foundational step to determine status, initiate timely care, or access preventative prescriptions through primary care physicians, urgent care facilities, or sexual health clinics.
Antiretroviral treatment and prevention strategies continue to evolve as newer formulations like biannual injections enter clinical practice alongside established oral therapies and barrier methods.