Sexual Health

Sexual health in the UK covers STI testing and treatment, contraception (including emergency contraception), genital herpes and cold sores, HIV prevention pathways such as PEP and PrEP, and knowing which service — sexual health clinic, GP, online pharmacy, or NHS 111 — is the right one for a particular question. This pillar brings together the essentials in plain UK English and points to the specific articles on Farmeci Blog that go into detail.

What sexual health means in a UK clinical context

UK sexual health services are structured around three overlapping needs: testing and treatment of sexually transmitted infections (STIs), contraception (regular and emergency), and prevention or management of conditions that affect the genital area — herpes simplex, human papillomavirus (HPV), pubic lice, and non-infectious skin issues. Services are provided through NHS sexual health clinics (formerly GUM clinics), general practice, community pharmacy, some walk-in centres, and regulated online providers. Access is confidential and free at NHS clinics regardless of GP registration or immigration status.

Two features distinguish UK sexual health from many other clinical areas. First, it is one of the few settings where testing is often actively encouraged even without symptoms — because chlamydia, gonorrhoea, HIV, and syphilis are frequently asymptomatic and the public health case for early detection is strong. Second, the same infections and issues affect people of all genders and orientations, so the pathways described below apply broadly. If you would like an overview of related topics for men specifically, our men’s health category covers erectile dysfunction and hormonal issues that sometimes sit alongside sexual health concerns.

STI testing: chlamydia, gonorrhoea, syphilis, and HIV

Four infections make up the bulk of UK STI testing: chlamydia, gonorrhoea, syphilis, and HIV. Trichomoniasis, hepatitis B and C, and mycoplasma genitalium are added in specific contexts. National recommendations are broadly that anyone sexually active under 25 should test for chlamydia annually and after each new partner; men who have sex with men are offered fuller screening (including throat and rectal swabs) every 3–12 months depending on activity; and anyone with a new partner, symptoms, or a partner diagnosed with an STI should test regardless of age.

How and where to test

Testing options include NHS sexual health clinics (self-referral, usually walk-in or online booking), GP surgeries, and free postal home-testing kits available in most English local authority areas via the local Sexual Health London or regional equivalent website. Home kits typically ask for a self-collected urine sample (for chlamydia and gonorrhoea), a finger-prick blood sample (for HIV and syphilis), and vaginal, throat, or rectal swabs where relevant. Results usually return within 3–10 days, and any positive result triggers a follow-up call and treatment plan. The NHS sexual health hub lists services by postcode.

When to test after possible exposure

Window periods matter because testing too early can miss an infection. Broadly: chlamydia and gonorrhoea can be detected reliably from about 2 weeks after exposure, HIV from 45 days for a fourth-generation lab test (or 90 days for some rapid tests), and syphilis from 12 weeks. Anyone with symptoms should test immediately regardless of window period. Symptoms that warrant a clinic visit include unusual discharge, bleeding between periods or after sex, pelvic or testicular pain, a burning sensation when urinating, and any new sore, ulcer, or rash in the genital area or mouth.

Site-specific testing is a detail worth understanding. Chlamydia and gonorrhoea can infect the throat and rectum without any genital involvement, and these sites are often missed by a urine-only test. A clinician will ask about the types of sex you have had and offer the appropriate swabs — there is no judgement in the question, only accuracy in the answer. If you test at home, you can request a fuller kit for extra sites where available. Not every home kit offers this, and it is one reason a face-to-face clinic remains the gold standard when concerns are recent, symptoms are present, or a partner has tested positive.

STI treatment pathways

Treatment in the UK follows British Association for Sexual Health and HIV (BASHH) guidelines and is typically initiated in the same clinic where testing occurred. Chlamydia is treated with a course of doxycycline (usually 100 mg twice daily for 7 days). Uncomplicated gonorrhoea is now treated with a single intramuscular injection of ceftriaxone due to widespread resistance to older regimens. Syphilis is treated with intramuscular penicillin, with dose and frequency depending on stage. HIV is not curable but is highly manageable with modern antiretroviral therapy, and effective treatment reduces viral load to undetectable levels — at which point the virus cannot be sexually transmitted (U=U).

Partner notification is a standard part of any positive result. NHS clinics offer to contact recent partners anonymously on your behalf if you prefer, and this is done to break the chain of infection rather than to allocate blame. Re-testing after treatment (test of cure) is recommended for gonorrhoea and in pregnancy for chlamydia. Because reinfection is common, repeat testing three months after a positive result is also usually advised.

Complications of untreated STIs are the main reason UK guidance emphasises early testing. Untreated chlamydia and gonorrhoea can cause pelvic inflammatory disease (PID) in women, which is a leading preventable cause of tubal-factor infertility and ectopic pregnancy, and epididymo-orchitis in men. Syphilis has three stages, and while the primary chancre and secondary rash often resolve without treatment, the infection persists and can cause serious neurological and cardiovascular damage years later. HIV progresses to AIDS if untreated but is fully manageable when caught and treated. None of this is inevitable — the entire pathway is short-circuited by early testing and standard antibiotic or antiviral treatment.

Contraception: regular methods and emergency options

UK contraception guidance divides methods by effectiveness with typical use rather than perfect use. Long-acting reversible contraception (LARC) — the copper coil, hormonal coil (IUS), contraceptive implant, and injection — sits at the top of the effectiveness table because it does not depend on daily action. Combined hormonal methods (pill, patch, ring) and the progestogen-only pill are effective when used correctly but more sensitive to missed doses. Barrier methods (condoms) are the only contraceptives that also reduce STI transmission and are often used alongside a hormonal method for that reason. All are available free of charge on the NHS through GPs and sexual health clinics.

Emergency contraception: ellaOne vs Levonelle

Emergency contraception is used after unprotected sex or contraceptive failure. Two oral options are available in the UK: levonorgestrel (Levonelle and generics), effective up to 72 hours after sex, and ulipristal acetate (ellaOne), effective up to 120 hours. The copper intrauterine device is the most effective option of all and can be fitted up to 5 days after unprotected sex or up to 5 days after the earliest expected date of ovulation. Timing, weight, and other medications influence which option is right, and this is the single area of contraception where speed makes the biggest practical difference — our dedicated article on ellaOne vs Levonelle compares the two head to head, including how BMI, cycle timing, and interaction with hormonal contraception affect choice.

Emergency contraception is free from NHS sexual health clinics, most GP surgeries, some community pharmacies (funding varies by area), and available for private purchase where NHS supply is not available. After emergency contraception, ongoing contraception should be discussed — because the emergency dose only prevents the immediate risk and does not protect against pregnancy for the rest of the cycle. If a period is more than a week late after taking emergency contraception, a pregnancy test is recommended.

Two nuances catch people out. First, if you take ellaOne (ulipristal), starting or restarting hormonal contraception should wait 5 days, because the hormonal contraceptive can reduce ellaOne’s effectiveness. Levonelle does not have that interaction and you can start hormonal contraception straight away. Second, higher body weight (typically BMI above 26 or weight above 70 kg for Levonelle, and above 85 kg for ellaOne) reduces oral emergency contraception’s effectiveness, which is one reason the copper coil is often recommended when weight is a factor. A sexual health clinician can talk through the specifics.

Genital herpes and cold sores

Herpes simplex virus (HSV) causes both cold sores (typically HSV-1) around the mouth and genital herpes (either HSV-1 or HSV-2). Most people carry the virus without symptoms; when symptoms occur they are typically small blisters or ulcers, sometimes with tingling or discomfort beforehand. A first episode of genital herpes is often more severe than subsequent recurrences, and can include flu-like symptoms and difficulty passing urine.

Treatment is with oral antiviral tablets such as aciclovir, valaciclovir, or famciclovir. These do not eradicate the virus but shorten and soften episodes, and for people with frequent recurrences (six or more per year) suppressive daily treatment can reduce outbreak frequency and reduce the risk of transmission. Topical creams offer limited benefit for cold sores if applied at the first sign of tingling. Herpes is often diagnosed clinically at a sexual health clinic and confirmed with a swab of a lesion. It is not routinely included in asymptomatic STI screening because most infections are lifelong and low-consequence, and a positive antibody test without symptoms rarely changes management.

Practical points that come up in clinic: recurrences are often triggered by stress, illness, ultraviolet light, or the menstrual cycle. Transmission risk is highest when a lesion is present, but a small amount of asymptomatic shedding can occur between episodes — suppressive therapy plus consistent condom use reduces that risk further. Pregnancy adds an extra layer: a first-episode primary infection late in pregnancy is the highest-risk scenario for neonatal herpes and often prompts a plan for caesarean section, whereas recurrent herpes in a woman who was infected long before pregnancy is much lower risk. Anyone diagnosed with genital herpes who becomes pregnant should mention it at booking so the plan can be tailored. Human papillomavirus (HPV) sits alongside herpes as a very common viral STI; most infections clear spontaneously, and the routine UK cervical screening programme now uses HPV as a primary test rather than cytology alone.

PEP, PrEP, and the wider HIV prevention picture

Post-exposure prophylaxis (PEP) is a 28-day course of HIV medication started ideally within 24 hours (and no later than 72 hours) after a specific high-risk exposure — for example a condom breaking with a partner of unknown or positive HIV status, or a sharps injury. In the UK, PEP is available free of charge from NHS sexual health clinics during opening hours and from A&E departments outside those hours. It is not intended for regular preventive use — for that, pre-exposure prophylaxis (PrEP) is the appropriate route: a daily or event-based tablet taken by people at ongoing risk of HIV, now available free through NHS sexual health clinics across the UK.

Neither PEP nor PrEP protects against other STIs, and condoms remain the best combined protection against a range of infections. The NHS HIV pages and NICE guidance outline current eligibility and dosing.

When to use a sexual health clinic, GP, or online service

Use a sexual health clinic when you have symptoms, a known contact with an STI, need a full screen including throat and rectal swabs, want emergency contraception outside pharmacy hours, want a coil fitted urgently, or need PEP. Clinics are self-referral, confidential, and often faster than GP appointments for these specific needs.

Use your GP for routine contraception, cervical screening, sexual dysfunction where an underlying medical cause is likely, and any long-term issue that will need ongoing prescribing. GPs can prescribe most contraceptives and manage herpes suppression, and they hold your wider medical record which is useful where interactions matter.

Use an online pharmacy service where the question is well-defined, the medication is standardised, and the safety questions can be reliably captured in writing — for example ongoing supply of oral contraception where you have already had a face-to-face review, treatment of confirmed genital herpes recurrences, or supply of medication already established elsewhere. Online routes should not be used when the presentation is unclear, when a physical examination is needed, when a full STI screen is required, or when time is critical (as with PEP). A GPhC-registered service will refuse to prescribe when the clinical picture does not fit, and will signpost you to the appropriate NHS route.

When to go directly to A&E or NHS 111: severe pelvic pain, high fever with genital symptoms (possible pelvic inflammatory disease), inability to pass urine because of pain or swelling, a suspected sharps injury or sexual assault where PEP may be needed out of hours, or any severe allergic reaction to a treatment. Sexual assault referral centres (SARCs) exist across the UK and provide medical care, forensic examination, and emotional support whether or not you choose to report to the police.

How Farmeci fits in

Farmeci is a UK GPhC-registered pharmacy service. This blog exists to translate NHS, BASHH, and NICE guidance into plain UK English so you can arrive at any consultation already understanding your options and questions. For sexual health, the NHS remains the front door for most needs — particularly free STI testing, clinic-based contraception, PEP, and PrEP. Where Farmeci can help is with ongoing supply of established treatments after clinical review, and with patient education across our related hubs including men’s health and women’s health. Any medication we supply follows a free online consultation and prescriber review; nothing is dispensed without that clinical check, and where a face-to-face service or urgent NHS pathway is more appropriate we will say so.