Which abbreviation denotes Reaction?

• A. Rx
• B. s/s
• C. rxn
• D. Tx

Answer: (C)

In clinical notes and pharmacology, abbreviations map to specific concepts. The shorthand for reaction is rxn, a concise way to indicate that a reaction occurred, such as an adverse drug reaction or a chemical reaction in a lab context. This makes rxn the best fit to denote the event itself.

Other terms refer to different ideas: Rx is the common abbreviation for prescription, not the event of reacting. s/s stands for signs and symptoms, describing what the patient presents with rather than the reaction itself. Tx denotes treatment, the management plan used after a reaction or other condition. Because they point to distinct concepts, they don’t denote a reaction.