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GHB campaign

G information resources

To help address increasing use of the drug G in Ireland we have teamed up with a number of organisations to produce information and harm reduction resources. 

These organisations are: Ana Liffey Drug Project,, Gay Switchboard Ireland, Gay Men’s Health Service, HIV Ireland, HSE National Social Inclusion Office, HSE Public Health, Rialto Community Drug Team.

Download A4 G Poster (Pink/english)

Download A4 G Poster (Black/english)

Download A3 Poster (Black/english)

Download A4 G Poster (portuguese)

Downaload A4 Poster (spanish)

Download A4 G Fact sheet (english)

Download A4 G Fact sheet (portuguese)

Download A4 G Fact sheet (spanish)

Download A5 G Card


What is G?

G is a term given to the drugs GHB (gamma hydroxybutyrate) and GBL (gamma butyrolactone). Both are depressant type drugs which can produce a high with small doses and sedation with only slightly higher doses. Users report that G makes them feel euphoric, with a loss of inhibitions, increased confidence and higher libido. Most users report that the experience is very similar to being drunk. The effects will vary from person to person and will depend on how much is consumed.

G metabolises to carbon dioxide and water, and it is rapidly eliminated from the body. It is not detectable after 8 hours in the blood and after 12 hours in urine.

G has a similar structure to Gamma Aminobutyric Acid (GABA) and acts on GABA-B receptors in the brain, the same receptors that alcohol acts on. By activating the GABA receptors, G can make parts of the brain become relaxed and less responsive.

G is used legitimately as an industrial solvent and paint stripper. GHB/GBL are controlled drugs under the Misuse of Drugs Act.

G Effects

The effects can begin about 20 minutes after consuming and may last up to four hours. A dose of G can make a person feel chilled out, aroused, and/or mildly high. Too much G can leave a person dizzy, confused, drowsy or vomiting. G use can also result in seizures, coma and death.

Some sought after effects:

Some unwanted effects:


G is physically addictive and dependence can develop very quickly or from regular use over a period of time. Dependence can mean that people will experience withdrawal symptoms on reduction or cessation of use, which can be severe or life threatening.
In certain situations, people may require inpatient treatment for G dependence. It is not advised that a person suddenly stops taking G themselves or attempts to self-detox. Withdrawal should be a slow, tapered process, with medical supervision of a doctor.


The onset of withdrawal can begin 1-2 hours after the last dose and can progress rapidly. Withdrawal can last up to 12 days.

Mild withdrawal symptoms include: anxiety; tremors; insomnia & vomiting; and high blood pressure.

Moderate withdrawal symptoms include: severe anxiety; confusion, delirium; feeling of skin crawling and hallucinations.

Severe withdrawal symptoms include: agitation; paranoia and psychosis; muscle breakdown, seizures and death.

Overdose (going under)

G has a steep dose-response curve, meaning there is only a small variation in the dose required to produce the ‘desired effect’ and the dose which could result in an overdose. Therefore, it is very easy to overdose on G.

G has a delayed onset which means it can take longer than expected to kick in. An additional risk is that someone may take a dose, think nothing is happening, and then take another dose. This can lead to accidental overdose.
Common signs of overdose can include: confusion; vomiting; dizziness; seizure; temperature; agitation; hallucination; difficulty breathing and coma.

G and Other Drugs (poly drug use)

GHB has the same/similar effects as benzodiazepines or alcohol, which can result in drowsiness, sedation, respiratory depression and death.

The risk of using GHB/GBL is greatly increased when used in combination with other substances like alcohol, ketamine and prescription tablets.

The use of G with stimulant drugs like cocaine, MDMA, mephedrone and crystal meth (Tina) can also be dangerous. Using G with other stimulants can make a person feel more awake. This can mean that someone can take more G than they normally would; increasing the risk of an unexpected overdose.

Sexual Assault And Consent

The sedative properties of G can leave a person incoherent or comatose, so they are unable to give their sexual consent. Whether a person unknowingly or willingly takes G, they are at risk of sexual assault. This can mean that people who use G in clubs or at sex parties are at risk of assault.

Safer Sex Advice

Using G can increase a person’s sex drive, thereby increasing the risk of having unprotected sex and increasing the risk of acquiring or transmitting HIV and other sexually transmitted infections (STIs).

Be prepared - carry condoms with you at all times - particularly if you know you will be using G.

Harm Reduction Advice

Below is some harm reduction information drug workers can provide to G users.

Every drop counts

Start low and go slow
Always use as low a dose of G as possible and wait until the effects are felt. Wait at least four hours before taking a second dose. Each container of G may vary in concentration and strength. There is no way of knowing how concentrated or pure it is. Starting with a test dose will help calculate further doses.

Because G affects memory, it can be difficult to remember when it was last taken. Preset alarms or write down times in a G diary so there is a reliable record of time.

Take G orally
Avoid snorting or injecting G. It is extremely dangerous to inject G even when constituted with water or other dilutions.

Alcohol and G
Avoid mixing G with alcohol. Mix with water, soft drinks or juice. Alcohol mixed with G can increase the risk of overdose (or going under) and can delay the amount of time it takes for G to take effect; this can interfere with safer dosing.

G and other drugs
Avoid using G with other drugs. This carries a risk of overdose. Mixing two or more substances, especially sedative drugs (ketamine & benzodiazepines) at the same time can increase the risk of going under or death. The use of G with stimulants (crystal meth, coke, snowblow) increases the risk of paranoia, hallucinations and aggression. HIV medications can increase the effects of G. It is advisable to use a lower dose of G if using these type of medications.

G and other medical conditions
Avoid if you have high or low blood pressure, epilepsy, convulsions, heart or breathing problems, depression or panic attacks.

Effects vary
The effects of G vary from person to person. What is a euphoric dose for one person could be a sedative dose for another.

Think about tolerance
Tolerance to G can develop quite quickly meaning more of the drug is needed to get the same effect. Try to keep track of your tolerance, writing down how much you take. If you have not taken G in a while, your tolerance may decrease. A change in tolerance can result in an overdose or death even if you restart at a small dose. Developing a tolerance to G will not protect against overdose. You can still overdose on G if you have developed a tolerance or dependency.

Use in trusted company
If possible, avoid using G alone and always use with people you trust in a safe environment. Ideally, there should be someone present who is not using G, who can monitor your consumption and the after-effects. Additionally, the sedative effects of G can put people in vulnerable situations and at risk of assault in clubs, festivals or private parties.

Carry condoms
G use increases libido and lowers inhibitions. Always carry condoms when using G.

Store your G safely
You can apply food colouring to G to differentiate it from other liquids. Don’t leave G in plastic bottles at home, parties or in clubs in case it is mistakenly consumed.

G is addictive
G is physically addictive and dependence to G can develop quickly. Try to avoid frequent use and don’t use for more than two days in a row.

Don’t suddenly stop
If you have developed a dependence to G, don’t suddenly stop using yourself. If you want to stop your G use, get information on a structured detoxification from your GP or local drug service. Withdrawal should be a slow, tapered process, with medical supervision by a doctor.

G withdrawal
G withdrawal can cause serious physical and mental health problems. Withdrawal symptoms can occur if you are dependent, reduce or miss a dose. Seek medical help from your local hospital if you experience acute withdrawal symptoms and have no G.

Seek medical help if needed
Seek medical help if you or a friend has used too much G. Don’t assume that people will ‘sleep it off’. A G overdose should be treated seriously. Going under on G can lead to seizures, coma, or death. Do not use other drugs in the hope of reversing the effects of G.

G reminder
Because G leaves the system quickly, it might be undetectable in your system by medics if you go under. Carry a ‘G card’ so medics know what you have taken. If you don’t have a G card, you could write ‘G’ or’ GHB’ on your hand or the inside of your wrist.

If you see someone ‘going under’ on G


For a full list of drug and alcohol services see
Online information and support for drug and alcohol use. Includes a national directory of drug and alcohol services.

Freephone Helpline:1800 459 459. Drugs, Alcohol, HIV, Hepatitis and Sexual Health Helpline.

National Drug Treatment Center
The HSE National Drug Treatment Centre is an integrated person centered specialist addiction service.

Gay Men’s Health Service 
Services for men who have sex with men (MSM) include free HIV and STI testing, free counselling, PEP, free condoms.

HIV Ireland 
Services include free HIV and STI testing, free condoms, free counselling and community support services for people living with HIV.

Ana Liffey Drug Project 
Services include Open Access Service, Needle and Syringe Outreach Programme, Medical Services and Case Management Service.

Belong To Youth Services
BeLonG To is the national organisation for Lesbian, Gay, Bisexual and Transgendered (LGBT) young people between the ages of 14-23. 
Sexual health information for men who have sex with men.

Gay Switichboard Ireland
Information and support via phone, email and online chat. Tel:(01) 872 1055 or


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The HSE and Union of Students in Ireland (USI) ask students to think about drug safety measures when using club drugs
Harm reduction messages from the #SaferStudentNights campaign.
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