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Firstly no drug like dopamine,caffeine is harmful even heroin but should be taken in limit nd when a person tales overdoses he can notice symptoms like headache, convulsions, hallucinations Hope it help
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Any of a class of nitrogenous organic compounds of plant origin which have pronounced physiological actions on humans. They include many drugs (morphine, quinine) and poisons (atropine, strychnine).
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