- Addiction : The state of response to a drug whereby the drug taker feels compelled to use the drug and suffers anxiety when separated from it
- Anesthesia : Loss of consciousness associated with absence of response to pain
- Anxiolytic : A drug that reduces anxiety, a sedative
- Dependence : The state of response to a drug whereby removal of the drug evokes unpleasant, possibly life-threatening symptoms, often the opposite of the drug's effects
- Hypnosis : Induction of sleep
- REM : sleep Phase of sleep associated with rapid eye movements; most dreaming takes place during REM sleep
- Tolerance : Reduction in drug effect requiring an increase in dosage to maintain the same response