MinorNSAID, propionic acid derivative×Anilides. Analgesics and antipyretics
Updated · Methodology
Mechanism
Naproxen acts on peripheral cyclooxygenase and has a long half-life, allowing twice-daily dosing; paracetamol works centrally. They share no relevant elimination pathway and do not displace each other from albumin, and the naproxen label reserves its combination warning for other NSAIDs and acetylsalicylic acid.
Symptoms
The pair produces no distinct picture. Naproxen keeps a high gastrointestinal risk because of its long half-life: epigastric pain, dyspepsia, black stools, plus fluid retention and rising blood pressure. Paracetamol adds hepatic risk only above the daily dose.
Management
The combination is acceptable in acute pain and in joint pain when naproxen alone is not enough. Keep a single NSAID, watch blood pressure in hypertensive patients, and consider gastric protection over age 65 or with a history of ulcer.
Check the full regimen, not just this pair
Opens the checker with these two drugs prefilled. Add the rest of the regimen and recompute additive risks.
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Sources
- AEMPS: Ficha técnica Ibuprofeno Cinfa 600 mg comprimidos recubiertos con película EFG (2024)– AEMPS, CIMA, nº registro 70039, secciones 4.4 y 4.5
- AEMPS: Ficha técnica Paracetamol Abamed 1 g comprimidos EFG (2020)– AEMPS, CIMA, nº registro 77758, secciones 4.2 y 4.5
- AEMPS: Ficha técnica Naproxeno Normon 500 mg comprimidos EFG (2024)– AEMPS, CIMA, nº registro 68435, sección 4.5