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Studies comparing ibuprofen plus codeine with placebo, with the outcome of at least 50% maximum pain relief over 4 to 6 hours. Colour code: white ‐ ibuprofen 200 mg + codeine 15 mg; yellow ‐ ibuprofen 200 mg + codeine 30 mg; light pink ‐ ibuprofen 400 mg + codeine 25.6 mg; medium pink ‐ ibuprofen 400 mg + codeine 30 mg; red ‐ ibuprofen 400 mg + codeine 60 mg; blue ‐ ibuprofen 800 mg + codeine 60 mg.
