Mixing DXM (robo) and GHB / GBL
Dangerous
Both wreck coordination and can cause vomiting and unconsciousness, and together they are hard to predict. Do not combine. If someone passes out, put them on their side.
Both substances cause ataxia and bring a risk of vomiting and unconsciousness. If the individual falls unconscious while under the influence there is a severe risk of vomit aspiration if they are not placed in the recovery position. This combination is hard to predict
This combination carries bodily risk and can go badly psychologically. The headspace part often arrives first and makes the physical part harder to notice.
Headspace vs physical riskWhat to do
- Say what was taken and how much.Responders need it, and in most US states Good Samaritan laws protect both of you from drug possession charges when you call for an overdose.
- Unresponsive: put them on their side, tilt the head back, and stay until help arrives.Never leave someone alone to “sleep it off”.
- Never Use Alone 1-800-484-3731Stays on the line and sends help if you stop responding.
- Full steps: what to do if it is already happeningOverdose signs, the recovery position, what to say on the call, and whether you can be charged for making it.
- Poison Control 1-800-222-1222Free and 24/7, for “is this bad?” before it becomes an emergency.
Can you mix DXM (robo) and GHB / GBL?
MixSafe rates mixing DXM and GHB / GBL as "Dangerous" — high risk of death or life-changing injury. Do not combine. Source: TripSit drug combination chart, retrieved 2026-08-20. Educational information, not medical advice.
- DXM
- Cold medicines often add acetaminophen or an antihistamine — check the label
- DXM also called
- robo, robitussin, robotussin, syrup, dex, cough syrup
- GHB / GBL also called
- ghb, gbl, liquid ecstasy, 1,4-butanediol, bdo, 1,4-bd
TripSit drug combination chart, retrieved 2026-08-20. View the dataset.
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Combinations of three or more carry risks that no pair-by-pair chart can show. The checker rates every pair at once and flags the whole-mix ones on top.
Open this in the checkerRelated combinations
All combinations →Rated dangerous. Educational information only, not medical advice. Absence of a documented interaction is not evidence of safety.