Chemsex in Portugal: Harm Reduction and Support

Portugal's Unique Context

Portugal is one of the few countries in the world where personal drug use has been decriminalised since 2001 — not legalised, but decriminalised. Possession of small amounts of any drug for personal use results in a referral to a Comissão para a Dissuasão da Toxicodependência (CDT — Dissuasion Commission), not criminal prosecution. This means you will not be arrested or charged simply for possessing drugs you use personally.

This context matters for harm reduction. You can engage with health services and support organisations about chemsex without fear of criminal consequences. Be honest with healthcare providers — they are legally and ethically prohibited from reporting personal drug use to police.

What Is Chemsex

Chemsex refers to the use of specific drugs — typically crystal methamphetamine (Tina/cristal), mephedrone (mefedrona/4-MMC), GHB/GBL, and sometimes ketamine — in sexual contexts, predominantly among gay and bisexual men. The combination of sexual intensity and drug use can lead to:

Extended sessions with multiple partners and elevated HIV/STI transmission risk
Dependency developing rapidly, particularly with crystal meth and GHB
Psychological difficulties including depression, anxiety, and paranoia after sessions
PrEP adherence challenges (missing doses during sessions, or crashing afterward)

If chemsex is becoming a source of concern for you, support is available without judgment.

First Contact: GAT and CheckpointLX

CheckpointLX (Lisbon): checkpointlx.org / 218 870 025 GAT Porto: gat.pt

GAT staff have specific training in chemsex harm reduction and are the most appropriate first contact. They can:

Talk through your situation without judgment
Offer harm reduction information specific to the drugs being used
Help you access STI and HIV testing after sessions
Refer to specialist support if you want to reduce or stop use
Advise on PrEP adherence strategies during chemsex

This is a no-judgment space — staff are accustomed to these conversations.

Harm Reduction Essentials

HIV and STIs

Chemsex increases STI transmission risk significantly. High-intensity sessions, multiple partners, and reduced attention to condom use all contribute. Combine this with the fact that many STIs are asymptomatic:

Test after every significant chemsex episode — at minimum HIV and syphilis, ideally a full three-swab panel
Keep PrEP going — if you are on daily PrEP, do not skip doses before or during sessions
If you miss PrEP doses during a session, assess the risk and consider PEP if the exposure was significant

GHB/GBL — The Overdose Risk

GHB and GBL have a narrow dosing window between a pleasant effect and unconsciousness. The risk multiplies when combined with alcohol or other depressants. Key rules:

Never mix GHB/GBL with alcohol — this combination can cause respiratory depression and death
Space doses by at least 2–3 hours
If someone becomes unresponsive or cannot be roused, call 112 immediately — this is a medical emergency
Tell the paramedics exactly what was taken — they cannot help effectively without this information, and personal drug use is decriminalised

Crystal Meth and Mephedrone

Both are stimulants that extend wakefulness and sexual arousal over many hours. The risks include cardiovascular stress, severe depression and anxiety in the days following use ("comedown"), and rapid psychological dependency with regular use. If you are using frequently, GAT or a specialist addiction service can help you assess whether use has crossed into dependency.

Injecting (Slamming)

If drugs are being injected, the infection risks are significantly higher. Never share needles, syringes, or any injecting equipment. Portugal's harm reduction services (see below) provide clean needles without judgment.

Specialist Support Services

SICAD / CAD (Centros de Aconselhamento e Detecção)

Portugal's public addiction and harm reduction services — contact through the Linha Vida (see below). These services operate under the decriminalisation framework and provide needle exchanges, counselling, and referrals to residential treatment.

Linha Vida Phone: 1414 Hours: 24 hours, free The national drug information and support line. Can advise on harm reduction, local services, and crisis support. Staff are not police and cannot report you.

APDES / Projeto GAT

Various non-governmental harm reduction projects operate mobile outreach in Lisbon and Porto, including some specifically oriented toward nightlife and gay/bisexual venues. Ask GAT staff about current projects.

ILGA Portugal Phone: 213 873 918

ILGA's psychological support team has experience with gay and bisexual men dealing with chemsex-related distress, including relationship difficulties, shame, and dependency concerns.

If You Want to Reduce or Stop

If chemsex has become something you want to change, the following are the most relevant pathways:

GAT/CheckpointLX for initial conversation and referrals — they will not judge, and they can identify the right specialist service for your needs
ILGA Portugal psychological service for the identity and relationship dimensions
Your Médico de Família can refer to a psiquiatra or psicólogo and to addiction services — be honest with them; they are bound by confidentiality
CAD / SICAD services for formal addiction assessment and support if use has become dependent

PrEP During Chemsex

If you are on PrEP and engage in chemsex:

Daily PrEP is protective during sessions even if you are not consistent about exact timing, but significant gaps reduce protection
If you use on-demand PrEP (2+1+1), it only works when you take the pre-sex doses — this can be harder to manage during extended or spontaneous sessions
If you have a chemsex session and are uncertain about your PrEP coverage, talk to CheckpointLX or your prescriber about whether a PEP course is warranted