Analysis of Specific Drugs Through Screening Tests

A drug refers to any chemical substance capable of inducing physiological and if relevant psychological alterations upon consumption by an organism. This definition typically distinguishes drugs from substances like food that primarily offer nutritional value. Drugs can enter the body through various routes including inhalation injection smoking ingestion absorption via skin patches administration as a suppository or dissolution under the tongue. In the realm of pharmacology a drug is a chemical compound usually with a well-defined structure that upon administration to a living organism triggers a specific biological response.