Make a plan for more than one risk
“Combination prevention” means choosing several measures for different questions rather than expecting one to do everything. The NHS HIV page discusses condoms, HIV pre-exposure prophylaxis (PrEP), urgent post-exposure prophylaxis (PEP) and effective HIV treatment. PrEP and PEP focus on HIV. Condoms may reduce transmission of other STIs and prevent pregnancy, while vaccines can prevent particular infections for eligible people. A sexual-health clinician can explain what is relevant to your contact and health history.
Testing is another part of a plan, but a negative test describes an infection and a time window; it is not protection during later contact. The testing guide explains specimen sites and follow-up. The barrier guide covers material and fit. Neither an identity label nor a partner's assumption should decide someone's prevention options. Tell a clinic what happened and what you want to prevent so the discussion stays practical.
PrEP is planned HIV prevention
HIV PrEP is medicine used by an HIV-negative person to reduce the chance of acquiring HIV. The NHS PrEP page says a health professional at a sexual-health clinic assesses it and arranges tests. A person's need depends on exposure, HIV testing, health and preferences, not a fixed stereotype. PrEP does not prevent pregnancy or other STIs. A clinic explains how to start, monitor or stop it; do not copy a friend's schedule.
If a partner living with HIV is on effective treatment with a sustained undetectable viral load, the NHS says they cannot transmit HIV sexually. A clinician can discuss that evidence alongside personal circumstances rather than assuming every person with HIV poses a transmission risk. Someone may still want condoms for other STIs or contraception. Ask what HIV and other STI tests, kidney checks or follow-up the local service recommends; those clinical details change and belong in an individual plan.
Get PrEP free in each UK nation
In England, the NHS says PrEP is free through sexual-health clinics; use the clinic finder and ask for a PrEP appointment. In Scotland, NHS inform confirms free access through NHS Scotland sexual-health services and explains how to contact a local service. If a booking pathway is full, contact the service for advice rather than purchasing medicine without assessment.
In Wales, NHS 111 Wales says NHS Wales provides PrEP to people assessed at high risk through any sexual-health clinic in Wales. In Northern Ireland, Sexual Health NI says all GUM clinics offer PrEP and lists the five Trust routes. Ask the clinic for current access and follow-up arrangements. These are nation-specific service routes; an England appointment website cannot be assumed to book a Scottish, Welsh or Northern Irish clinic.
PEP is an urgent assessment
PEP is medicine considered after a possible HIV exposure. The NHS advises going to a sexual-health clinic urgently if exposure may have occurred within the last 72 hours; A&E is another route. A clinician decides whether PEP is indicated, and earlier assessment is better. Do not wait for symptoms, a home test or a routine PrEP booking. Bring the time and kind of contact and any medicines you already take. This page gives no regimen.
PEP is not a replacement for a planned prevention conversation, and PrEP is not a way to retrospectively answer a possible exposure. After urgent care, ask what testing and follow-up are needed and whether PrEP might be appropriate for future contact. If a barrier broke and pregnancy is also possible, emergency contraception requires a separate prompt conversation. The contraception guide explains where to ask. A single visit can raise several questions; state them all clearly.
Vaccines and other tools
A sexual-health clinic can assess eligibility for vaccines relevant to sexual health, such as hepatitis A, hepatitis B, HPV or mpox according to current national guidance and individual risk. The NHS mpox vaccine page describes its higher-risk eligibility and clinic access; the mpox guide explains why this advice requires regular checking. The vaccination glossary defines the term. Do not assume a vaccine protects against HIV or every STI. A clinician can review records and advise what is actually available in your area.
Bacterial STI prevention is also changing. The doxy-PEP guide explains BASHH's 2025 guideline for defined groups and why it is not a self-prescribing recommendation. It does not prevent HIV or replace testing. Condoms, vaccination, PrEP and treatment can coexist in a plan. Ask the clinic about side effects, contraindications and interactions before any medicine decision. If one tool is unavailable or unwanted, discuss other ways to reduce the particular risk.
Keep review and privacy workable
A prevention plan can change when partners, practices, health or access change. Ask the clinic when to return for HIV and STI testing, whether a symptom changes the plan and how to reach a clinician between appointments. A person taking PrEP still needs appropriate follow-up; a missed visit should prompt contact with the service rather than improvising. The sexual health glossary offers definitions, but the clinic's current instructions settle clinical timing.
Agree with partners about condoms and other boundaries without demanding private medicine records as proof of trust. Ask a service how it communicates results if you share a phone or home. A partner's HIV status or a person's use of PrEP does not establish consent to any act; consent remains current and specific. If a conversation is pressured or unsafe, ask the clinician to speak with you alone. Sexual-health services are used to discussing confidential concerns.
Common questions about HIV prevention
Does PrEP protect against all STIs? No; it focuses on HIV. Is PEP something to arrange at the next routine check-up? No, possible exposure needs prompt assessment. Is PrEP free in the UK? NHS sexual-health services in England, Scotland, Wales and Northern Ireland provide it, subject to clinical assessment. Do vaccines replace condoms? No; a vaccine covers its specific infection. Does a negative HIV test cover later contact? No.
If my partner's HIV treatment is effective and their viral load is undetectable, can HIV pass sexually? The NHS says no; ask a clinician about individual questions. What if I missed PrEP or changed how I take it? Contact the prescribing clinic, and seek urgent PEP advice if a recent exposure may need it. Does doxy-PEP prevent HIV? No. Can I choose a barrier even with PrEP? Yes, especially for other STIs or pregnancy prevention.
UK routes for prevention advice
For England use the NHS finder. For Scotland use NHS inform's PrEP route. For Wales use NHS 111 Wales or a local NHS sexual-health clinic. For Northern Ireland use the Trust clinic list. Ask directly for a prevention consultation, HIV and STI testing and vaccine eligibility. The UK help directory gives broader signposting.
For a possible recent HIV exposure, seek a sexual-health clinic or A&E promptly, rather than waiting for the next convenient appointment. A GP or pharmacist can direct you to a sexual-health service, but a specialist clinician should assess PrEP, PEP and relevant tests. This guide deliberately does not supply medicine doses or schedules. Bring medication details, symptoms and exposure timing so the service can provide safe, current advice.