Cyffuriau A i Y
- Gram.Diffiniad
- GoddefeddDiffiniad
- GammabutyrolactoneDiffiniad
- GBLDiffiniad
- Goranadlu’n gyflymDiffiniad
- GwnDiffiniad
- GouchDiffiniad
- Gwddf potelDiffiniad
- Gwrth-histaminDiffiniad
- Gwrth-gyfogyddionDiffiniad
- GwrthfiotigauDiffiniad
- GBHGHB
- GHBGHB
- GabaGabapentin
- GabapentinGabapentin
- GabbiesGabapentin
- GabbyGabapentin
- GackCrystal Meth
- Gamma-Hydroxybutyric AcidGHB
- GammahydroxybutyrateGHB
- GanjaCanabis
- GanjaCanabis
- GearHeroin
- GhatKhat
- GlassCrystal Meth
- Go FastAmphetamines
- Gold SealCanabis
- Gold sealCanabis
- GrassCanabis
- Green AppleEcstasi
- Green DevilsTemazepam
- Green EggsTemazepam
- GwairCanabis
- GwinAlcohol
- GwirodyddAlcohol