INTRODUCTION TO POSOLOGY

This set of notes provides a comprehensive overview of *Posology*, the branch of pharmacology that deals with the study of dosages of medicines and drugs. It begins with an **Introduction to Posology**, outlining its definition and significance in clinical practice. The notes then explore various **Factors Influencing Drug Dosage**, including physiological and environmental aspects such as age, sex, body weight, route and time of administration, and emotional and environmental influences. Clinical considerations like disease, drug accumulation, and interactions (additive effects, synergism, and antagonism) are also discussed. Special attention is given to individual variability due to **idiosyncrasy**, **tolerance**, and **tachyphylaxis**. Finally, the notes include essential methods and examples for the **Calculation of Drug Doses**, equipping students with practical skills for accurate medication administration.