- Narcotic drugs primarily act on the central nervous system to relieve pain and induce sleepiness. They carry a high risk of dependence and addiction. - Morphine is a potent opioid agonist and is used for severe pain relief. - Diazepam is a benzodiazepine, used for anxiety and muscle spasms. - Ibuprofen is a non-steroidal anti-inflammatory drug (NSAID), used for pain and inflammation. - Mestranol is a synthetic estrogen, used in hormonal contraceptives.