For example, apart from being given three to four times a day on a time-contingent basis, ibuprofen or naproxen or most other NSAIDs may be taken p.r.n. (as occasion rises) when pain is troublesome and omitted at other times.
Source: wiktionary
P.r.n.
Synonyms for "p.r.n."
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.