Neither. A hallucinogen.
Hallucinogens
Heroin is a Narcotic drug.
stimulant it's a neurotransmitter, not a drug
Nicotine is a stimulant.
Lsd
Ethanol is an euphoric compound.
Quinine is a drug used to treat malaria. It is neither a stimulant nor a depressant.
i am a carrot.
Depressant
Bupropion is considered an antidepressant drug with stimulant effect. But it can't be classified as a "CNS stimulant".
depressant
depressant
It doesn't have a stimulant effect. It is a analgesic with "depressant" effect.