Cyffuriau A i Y
- DibyniaethDiffiniad
- DimethyltryptamineDiffiniad
- DAATDiffiniad
- DeliwrDiffiniad
- Diffyg hylifDiffiniad
- DetoxDiffiniad
- DextromethorphanDiffiniad
- DistalgesicDiffiniad
- DiethylproprionDiffiniad
- DigDiffiniad
- Dod oddi ar gyffuriau/alcoholDiffiniad
- DôpDiffiniad
- Dos gormodolDiffiniad
- DF'sDihydrocodeine
- DF118'sDihydrocodeine
- DHCDihydrocodeine
- DMTDMT
- DalmaneBenzodiazepinau
- DeathPMA
- Deca-DurabolinSteroidau
- DexAmphetamines
- Dexamphetamine SulphateAmphetamines
- DexiesAmphetamines
- DextroamphetamineAmphetamines
- DextromoramidePalfium
- DiacetylmorphineHeroin
- Diamorphine hydrochlorideHeroin
- DianabolSteroidau
- Diazepam (Valium)Benzodiazepinau
- DiconalDiconal
- DiconalDiconal
- Diffs.Dihydrocodeine
- DihydrocodeineDihydrocodeine
- DikesDiconal
- DimitriDMT
- Diodydd egniCaffein
- Diodydd ysgafnCaffein
- Dipipanone HydrochlorideDiconal
- DodgiesMSJ
- DoggiesMSJ
- DownersBenzodiazepinau
- Dr. DeathPMA
- DragonHeroin
- DrawCanabis
- DrinkAlcohol
- DroneMeffedron
- Drunk PillsTemazepam
- DuragesicFentanyl
- DurogesicFentanyl
- Dôp (Dop)Canabis