Based on the organ systems, the fourth edition of this recognized work provides a good overview of the effects, side effects, and interactions of common medications, as well as specific advice for pregnancy and breastfeeding. Knowledge of the effects and side effects of medications is essential for their safe use. When multiple medications are taken simultaneously, interactions can occur at various levels of pharmacokinetics and pharmacodynamics. In the 4th edition, approximately 70 new drugs have been included, while those no longer available have been removed. New chapters have been added on personalized therapy, which takes into account not only the specific disease profile but also the individual physiological constitution and unique molecular biological configurations. Additionally, a chapter on antiviral therapies has been included.