![]() It is commonly specified in metric mass (e.g., milligrams) or international units (an agreed upon measure of biological effect for a given drug). The dose is the amount of a drug to be taken at one time. In the 16th century, the word was abbreviated as ℞-the letter R with a line across the leg, which indicated that the R was an abbreviation. Latin word recipe, meaning “take” ( recipe is the imperative form of recipere, meaning “to take”). ℞ (or Rx) is an abbreviation for “medical prescription”. Units of measurement are lowercase except when mixed case is recommended to help avoid prescription errors.įor a more comprehensive alphabetical list of abbreviations, consult OpenMD’s index of medical abbreviations. For simplicity, the following tables use lowercase letters for Latin abbreviations and capital letters for English initialisms. Abbreviation formatting: Abbreviation formatting varies widely by institution (e.g., PRN, prn, p.r.n.).A warning symbol appears next to abbreviations that are particularly prone to causing prescription errors. Dangerous abbreviations: Numerous organizations advise medical professionals to minimize or avoid using abbreviations in prescriptions due to the risk that they may be misread or misunderstood.The tables below summarize the most common abbreviations that appear on prescriptions. Additionally, they tell the pharmacist how much to dispense and how many refills are available. Prescriptions specify a drug or therapy name, dose, form, delivery route, frequency, timing, and purpose. Medical prescriptions are written directions for the preparation and administration of a specific medication or treatment.
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