Chapter 15: Calculation of Medication and Intravenous Dosages

Students engage with three primary measurement systems—metric, household, and apothecary—and develop proficiency in converting between units using ratio and proportion methodology. The content progresses through interpretation of medication labels and prescriptions, examining critical elements such as drug name, prescribed dosage, route specification, and frequency of administration. Learners master calculation approaches including dosage formulas and dimensional analysis techniques, with particular attention to appropriate rounding conventions that vary by patient population and clinical context. The chapter systematically covers oral administration modalities encompassing tablets, capsules, and liquid formulations, as well as parenteral routes including intramuscular, subcutaneous, intradermal, and intravenous administration with corresponding syringe selection and handling procedures. Medication reconstitution processes receive detailed explanation, including proper labeling and documentation of reconstituted solutions. Insulin administration receives specialized coverage with sequencing protocols for multiple insulin types. Intravenous therapy calculations form a substantial portion of the chapter, encompassing flow rate determination in milliliters per hour and drops per minute using macrodrip and microdrip tubing calibrations. Safety principles throughout emphasize prevention of medication errors through accurate calculation verification and prohibition of rate adjustment techniques that compromise patient safety. The integration of realistic clinical scenarios and practice problems develops critical thinking necessary for accurate dosage administration across diverse medication types and delivery systems.