The UK — and London in particular — has the most developed chemsex harm reduction infrastructure in the world. The services below are good. They are non-judgmental, LGBTQ+-aware, and staffed by people who have seen everything.

For the clinical background on chemsex drugs (mephedrone, GHB/GBL, crystal meth), interactions, overdose risks, and safer use, see Chemsex: The Clinical Guide first if you haven't already.

If It's an Emergency Right Now

999 — for overdose, unconsciousness, respiratory depression, or suspected GHB/GBL overdose (which can be fatal without intervention). Do not wait.

If someone has gone under on G: Put them in the recovery position, call 999, stay with them. Time matters.

For the GHB/GBL overdose protocol, see Chemsex: The Clinical Guide.

London Services

London has a concentration of specialist chemsex support. If you're elsewhere, jump to Regional Services below.

56 Dean Street (Soho)

56 Dean Street isn't just a sexual health clinic — it operates a specific service for people who use drugs in sexual contexts.

Recovery Support Workers: Dean Street has dedicated workers experienced in chemsex. They can provide harm reduction advice, referrals to treatment, and support for people who want to reduce or stop.

CGL (Change Grow Live) at Dean Street: CGL is a national drug and alcohol treatment provider; their Dean Street team specialise in the gay/bi/queer male population.

Contact via the main Dean Street booking system or ask specifically for the chemsex support service at reception. Website: deanstreetsexualhealth.com

Antidote (at London Friend)

Antidote is the UK's primary LGBTQ+-specific substance use service. The only one of its kind nationally. They understand chemsex in the specific cultural context of gay male life, not just as a generic drug problem.

Services: Individual counselling, group therapy, chemsex support groups, harm reduction, mental health support.

This matters: Chemsex and mental health are frequently intertwined. Antidote handles both.

Tel: 020 7833 1674 Website: londonfriend.org.uk/antidote

Club Drug Clinic (Chelsea & Westminster Hospital)

A specialist NHS service for people who use club drugs — mephedrone, GHB/GBL, ketamine, cocaine, MDMA. Founded by researchers who study these substances; the clinical team have deep expertise.

What they offer: Assessment, pharmacological support (e.g., managing GBL dependence safely), counselling, and harm reduction.

Note on GBL dependence: GBL/GHB dependence is medically serious — abrupt withdrawal can cause seizures and is potentially fatal. The Club Drug Clinic is one of the few services equipped to manage this properly. If you're dependent on G, get assessed before trying to stop.

Tel: 020 3315 5000 Website: chelwest.nhs.uk (search "Club Drug Clinic")

SWOP (Spectra London / other providers)

Several London-based organisations provide chemsex outreach and harm reduction. Check with the Dean Street or Antidote teams for current local provision — services shift over time.

Outside London

Chemsex services outside London are less developed, but growing. Your starting points:

LGBT Foundation (Manchester)

LGBT Foundation runs support programs for gay and bisexual men in the North West, including chemsex support.

Tel: 0345 3 30 30 30 Website: lgbt.foundation

Turning Point

National drug and alcohol treatment provider with services across the UK. Mainstream, not LGBTQ+-specific, but professional and non-judgmental. Ask your local Turning Point service specifically about their experience with chemsex.

Website: turning-point.co.uk

Your local GUM clinic

Any decent GUM clinic can refer to specialist support and provide harm reduction advice. It's worth being honest at your sexual health appointments. GUM staff are used to hearing about chemsex — it won't surprise them and they won't judge.

FRANK

Not a specialist chemsex service, but FRANK is the national drug information and support line — 24/7, free, and genuinely non-judgmental.

Tel: 0300 123 6600 (24/7) Text: 82111 Website: talktofrank.com

Harm Reduction Without Stopping

If you're not ready to stop but want to reduce risk, these are the key principles:

GHB/GBL:

  • Measure precisely. The difference between a dose and an overdose is small.
  • Never mix with alcohol, benzos, or opioids. The combination dramatically increases overdose risk.
  • Don't redose if you're already intoxicated — you can't accurately judge the dose.
  • If you're using regularly, consider dosing intervals carefully — GBL dependence develops quickly.

Crystal meth:

  • Regular use changes the brain's dopamine system. What starts as recreational can become compulsive faster than with most substances.
  • Meth and PrEP: no significant pharmacokinetic interaction, but meth use increases riskier sexual behaviour and increases HIV/STI transmission risk in ways PrEP doesn't fully offset.

Mephedrone (meph/meow):

  • Strong compulsion to redose is characteristic of mephedrone. Set a limit before you start, not during.
  • Injection of mephedrone (slamming) dramatically increases addiction risk and wound/blood infection risk.

For full drug-specific harm reduction, interactions, and overdose protocols: Chemsex: The Clinical Guide.

The Testing Connection

Chemsex often involves sex with multiple partners, which means the standard testing protocol matters more, not less. If you're using in sexual contexts, the 3-month sexual health screen is the baseline — but you may want to consider more frequent testing.

The three-site panel (throat, rectal, urethral) is essential. Asymptomatic gonorrhoea and chlamydia are common in chemsex contexts; you'll miss them with a urine test alone.

See: Postal Testing: The White Box Revolution — convenient testing between clinic visits.

When It's Becoming a Problem

The line between recreational use and problematic use isn't always obvious when you're inside it. Some markers:

  • Using more frequently than you intended
  • Using alone or to manage mood (not just socially)
  • Sleep significantly disrupted (common with meth/meph)
  • Using during the week (not just weekends)
  • Craving or planning your next session
  • Difficulty enjoying sex without substances
  • Missing work, appointments, or social commitments
  • Continuing despite health consequences or wanting to stop

None of these means you've "failed." They're information. The question is what you do with the information.

Recognizing When Use Becomes a Problem goes into this in more depth.

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