1. GABA: agonists are used as CNS depressants (e.g. anesthetics, anti-anxiolytics, sedative, hypnotic, insomnias, antiepileptics)2. Dopamine: antagonists used as antipsychotics, treat thought disorder (e.g. schizophrenias)3. Adrenaline/ epinephrine: α, β1 agonist for hypotension, α, β1 antagonist for hypertension. β2 agonist for asthma, COPD4. Acetylcholine: antagonists to counteract the effects of serine, motion sickness, COPD, muscle relaxant etc.Partial agonists and small doses of nicotine to quit smoking.

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