GHB/GBL + Mephedrone: Caution

GHB/GBL+Mephedrone

Caution

These combinations are not usually physically harmful, but may produce undesirable effects. Use caution.

Note: Both can dull each other's effects, so if one wears off before the other it's possible to overdose due to the lack of counteraction. Both substances affect the heart and may lead to further dangerous heart complications at higher dosages. Additionally, the combination may increase the negative side effects of each other.

Substances in these categories

GHB/GBL

Mephedrone

Sources

New "Lethal highs": A case of a deadly cocktail of GHB and Mephedrone. Forensic Science International, 223(1), e38–e41 (2012) — Aromatario, M., Bottoni, E., Santoni, M., & Ciallella, C.
Drug Combinations "Mixing Drugs" - Drug and Alcohol Information and Support in Ireland (2025) — Drugs.ie
γ-Hydroxybutyric Acid: Pharmacokinetics, Pharmacodynamics, and Toxicology. The AAPS Journal, 23(1), 22 (2021) — Felmlee, M. A., Morse, B. L., & Morris, M. E.
Liquid ecstasy intoxication: clinical features of 505 consecutive emergency department patients. Emergency Medicine Journal: EMJ, 28(6), 462–466 (2011) — Galicia, M., Nogue, S., & Miró, O.
Mephedrone, compared with MDMA (ecstasy) and amphetamine, rapidly increases both dopamine and 5-HT levels in nucleus accumbens of awake rats. British Journal of Pharmacology, 164(8), 1949–1958 (2011) — Kehr, J., Ichinose, F., Yoshitake, S., Goiny, M., Sievertsson, T., Nyberg, F., & Yoshitake, T.
Novel Psychoactive Substances – GHB- and Mephedrone-Induced Delirium Treated with Olanzapine: A Case Report and Literature Review. Medicina Fluminensis, 61(3), 318–326 (2025) — Kozina, L., Grizelj Benussi, M., & Sutara, N.
Mephedrone induces partial release at human dopamine transporters but full release at human serotonin transporters. Neuropharmacology, 240, 109704 (2023) — Mayer, F. P., Niello, M., Bulling, S., Zhang, Y.-W., Li, Y., Kudlacek, O., Holy, M., Kooti, F., Sandtner, W., Rudnick, G., Schmid, D., & Sitte, H. H.
Clinical Pharmacology of the Synthetic Cathinone Mephedrone. Neuropharmacology of New Psychoactive Substances (NPS): The Science Behind the Headlines, pp. 313–331 (2017) — Papaseit, E., Moltó, J., Muga, R., Torrens, M., de la Torre, R., & Farré, M.
Case series of individuals with analytically confirmed acute mephedrone toxicity. Clinical Toxicology, 48(9), 924–927 (2010) — Wood, D. M., Davies, S., Greene, S. L., Button, J., Holt, D. W., Ramsey, J., & Dargan, P. I.

Interaction Matrix

Tap or hover on any cell to see the interaction. Click to view details.

✓+Synergy

✓Low Risk

↓Decrease

!Caution

⚠Unsafe

☠Dangerous


	!	!	↓	⚠	☠	↓	✓	!	⚠	⚠	?	✓+	!	↓	✓+	☠	✓+	!	!	?	!	✓+	!	!	✓+	✓	☠	?	↓	⚠
!		!	↓	!	☠	↓	✓	!	!	✓+	?	✓+	!	↓	✓+	☠	✓+	!	✓+	?	!	✓+	✓+	!	✓+	✓	✓+	✓+	↓	⚠
!	!		↓	⚠	☠	↓	✓	!	⚠	⚠	?	✓+	!	↓	✓+	?	✓+	☠	!	?	!	✓+	✓+	!	✓+	✓	☠	!	↓	⚠
↓	↓	↓		!	!	☠	✓	✓+	⚠	☠	☠	↓	↓	☠	☠	?	↓	⚠	!	?	↓	↓	☠	↓	!	☠	⚠	?	!	☠
⚠	!	⚠	!		☠	↓	!	!	!	⚠	!	!	⚠	!	!	✓	!	☠	!	?	!	!	!	⚠	✓+	!	⚠	⚠	✓	☠
☠	☠	☠	!	☠		↓	!	!	☠	☠	?	✓+	☠	↓	✓+	?	✓+	☠	☠	?	☠	✓+	☠	☠	✓+	✓	☠	?	☠	☠
↓	↓	↓	☠	↓	↓		↓	↓	↓	!	⚠	↓	↓	☠	!	?	↓	✓+	↓	?	↓	↓	!	↓	↓	☠	⚠	?	✓	☠
✓	✓	✓	✓	!	!	↓		✓	!	!	!	✓	!	✓	✓	?	✓	✓	!	!	✓	✓	✓	!	✓	✓	!	⚠	✓	✓
!	!	!	✓+	!	!	↓	✓		!	✓+	?	!	!	✓+	✓+	?	!	✓+	✓+	?	!	!	✓+	!	✓+	✓+	✓+	✓+	✓	✓+
⚠	!	⚠	⚠	!	☠	↓	!	!		⚠	!	!	⚠	!	!	↓	!	☠	!	?	!	!	!	⚠	✓+	☠	⚠	⚠	✓	☠
⚠	✓+	⚠	☠	⚠	☠	!	!	✓+	⚠		⚠	✓+	⚠	☠	✓+	☠	✓+	☠	☠	☠	✓+	✓+	⚠	⚠	✓+	☠	☠	⚠	☠	☠
?	?	?	☠	!	?	⚠	!	?	!	⚠		!	!	☠	☠	!	!	⚠	?	☠	!	!	☠	!	?	⚠	?	⚠	☠	☠
✓+	✓+	✓+	↓	!	✓+	↓	✓	!	!	✓+	!		✓+	↓	✓+	☠	✓+	✓+	✓+	✓+	✓+	✓+	✓+	✓+	✓+	✓	✓+	✓+	↓	⚠
!	!	!	↓	⚠	☠	↓	!	!	⚠	⚠	!	✓+		↓	✓+	☠	✓+	!	!	!	!	✓+	!	!	✓+	✓	⚠	!	↓	⚠
↓	↓	↓	☠	!	↓	☠	✓	✓+	!	☠	☠	↓	↓		☠	?	↓	✓+	!	!	↓	↓	☠	↓	!	☠	☠	☠	✓	☠
✓+	✓+	✓+	☠	!	✓+	!	✓	✓+	!	✓+	☠	✓+	✓+	☠		✓	✓+	!	✓+	?	✓+	✓+	✓+	✓+	✓+	☠	✓+	!	✓	☠
☠	☠	?	?	✓	?	?	?	?	↓	☠	!	☠	☠	?	✓		☠	?	☠	?	☠	☠	☠	☠	✓	?	?	?	✓	☠
✓+	✓+	✓+	↓	!	✓+	↓	✓	!	!	✓+	!	✓+	✓+	↓	✓+	☠		↓	✓+	!	✓+	✓+	✓+	✓+	✓+	✓	✓+	!	↓	⚠
!	!	☠	⚠	☠	☠	✓+	✓	✓+	☠	☠	⚠	✓+	!	✓+	!	?	↓		☠	?	!	✓+	⚠	!	✓	!	☠	?	☠	☠
!	✓+	!	!	!	☠	↓	!	✓+	!	☠	?	✓+	!	!	✓+	☠	✓+	☠		☠	✓+	✓+	!	!	✓+	✓	⚠	⚠	↓	☠
?	?	?	?	?	?	?	!	?	?	☠	☠	✓+	!	!	?	?	!	?	☠		?	✓+	?	?	?	!	?	⚠	?	☠
!	!	!	↓	!	☠	↓	✓	!	!	✓+	!	✓+	!	↓	✓+	☠	✓+	!	✓+	?		✓+	✓+	!	✓+	✓	✓+	!	↓	⚠
✓+	✓+	✓+	↓	!	✓+	↓	✓	!	!	✓+	!	✓+	✓+	↓	✓+	☠	✓+	✓+	✓+	✓+	✓+		✓+	✓+	✓+	✓	✓+	✓+	↓	⚠
!	✓+	✓+	☠	!	☠	!	✓	✓+	!	⚠	☠	✓+	!	☠	✓+	☠	✓+	⚠	!	?	✓+	✓+		!	✓+	☠	!	!	!	☠
!	!	!	↓	⚠	☠	↓	!	!	⚠	⚠	!	✓+	!	↓	✓+	☠	✓+	!	!	?	!	✓+	!		✓+	✓	✓+	☠	↓	⚠
✓+	✓+	✓+	!	✓+	✓+	↓	✓	✓+	✓+	✓+	?	✓+	✓+	!	✓+	✓	✓+	✓	✓+	?	✓+	✓+	✓+	✓+		!	✓+	!	✓	!
✓	✓	✓	☠	!	✓	☠	✓	✓+	☠	☠	⚠	✓	✓	☠	☠	?	✓	!	✓	!	✓	✓	☠	✓	!		!	☠	✓	☠
☠	✓+	☠	⚠	⚠	☠	⚠	!	✓+	⚠	☠	?	✓+	⚠	☠	✓+	?	✓+	☠	⚠	?	✓+	✓+	!	✓+	✓+	!		?	⚠	☠
?	✓+	!	?	⚠	?	?	⚠	✓+	⚠	⚠	⚠	✓+	!	☠	!	?	!	?	⚠	⚠	!	✓+	!	☠	!	☠	?		?	⚠
↓	↓	↓	!	✓	☠	✓	✓	✓	✓	☠	☠	↓	↓	✓	✓	✓	↓	☠	↓	?	↓	↓	!	↓	✓	✓	⚠	?		☠
⚠	⚠	⚠	☠	☠	☠	☠	✓	✓+	☠	☠	☠	⚠	⚠	☠	☠	☠	⚠	☠	☠	☠	⚠	⚠	☠	⚠	!	☠	☠	⚠	☠

Low Risk & Synergy

These drugs work together to cause an effect greater than the sum of its parts. They aren't likely to cause an adverse or undesirable reaction when used carefully.

Low Risk & No Synergy

Effects are additive. The combination is unlikely to cause any adverse or undesirable reaction beyond those that might ordinarily be expected from these drugs.

Low Risk & Decrease

One substance may reduce or counteract some of the effects of the other.

Caution

These combinations are not usually physically harmful, but may produce undesirable effects. Use caution.

Unsafe

There is considerable risk of physical harm when combining these substances. Use extreme caution.

Dangerous

These combinations are considered dangerous and should be avoided.

Unknown

The interactions between these substances are not well documented.