UNIT 3 Drugs acting on nervous system Below is a comprehensive framework for the basis and applied pharmacology of commonly used drugs. This outline can be adapted to many medications and serves as a guide for understanding each drug’s profile—from its chemical makeup to its clinical use and monitoring. 1. Composition 2. Mechanism of Action (Action) 3. Dosage and Route of Administration 4. Indications 5. Contraindications 6. Drug Interactions 7.