Find dosage information for over 5,000 prescription and over-the-counter medications, based on FDA-approved labeling and established drug reference sources. Strengthen your mastery of dosage calculations and clinical decision-making with these related guides. Each article builds on the skills you learned here and helps you move confidently through increasingly complex medication math. In clinical pharmacology, dose refers to the amount of drug administered to a person, and dosage is a fuller description that includes not only the dose (e.g., 500 mg ) but also the frequency and duration of the treatment (e.g., twice a day for one week ). Dosage is the predetermined amount and rate of administration of a drug for a patient. According to the AMA (American Medical Association) Manual of Style, Dosage is the prescribed administration of a predetermined amount, number, and frequency of doses of drug over a specific period of time. A dose is the amount of a substance administered at one time, while dosage refers to the frequency and size of doses over a period. In pharmacology and medicine, dosage refers to the prescribed regimen for administering a medication or substance, encompassing the amount, frequency, and duration of use. [1] Detailed Ibuprofen dosage information for adults and children. Includes dosages for Pain, Osteoarthritis, Rheumatoid Arthritis and more; plus renal, liver and dialysis adjustments. The meaning of DOSAGE is the addition of an ingredient or the application of an agent in a measured dose. DOSAGE definition: 1. the amount of medicine that you should take at one time: 2. the amount of medicine that you…. Learn more. A dose is the amount of a drug taken at one time, while dosage refers to how often and how long you'll take the drug for. Following guidelines for dose and dosage can ensure you get effective treatment.