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Dosage/Direction for Use
Oral Mild to moderate pain Adult: 500 mg to 1 g every 4-8 hr. Max: 4 g/day. Child: 12-15 yr: 500 mg once or bid. Max: 1 g daily. >15 yr: 500 mg to 1 g every 4-8 hr. Max: 4 g/day. Oral Acute migraine attacks Adult: 1 g every 4-8 hr. Max: 4 g/day. Child: >15 yr: 1 g every 4-8 hr. Max: 4 g/day. Otic/Aural Otic inflammation Adult: 4-6 drops (0.5% solution) 3-4 times daily depending on the severity of inflammation. Otic/Aural Removal of earwax Adult: 4-6 drops (0.5% solution) 3-4 times daily depending on the severity of inflammation. |
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Contraindications
Allergy to pyrazolones or other NSAIDs. G6PD deficiency, porphyria. Otic/Aural: Perforated eardrums.
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Special Precautions
Pregnancy. History of blood disorders.
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Adverse Reactions
Hypersensitivity reactions, nephrotoxicity. Nausea, drowsiness, convulsive crisis, agranulocytosis, leucopenia.
Potentially Fatal: Coma (large oral doses), severe skin eruptions. |
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Drug Interactions
May affect metabolism of drugs metabolised by liver enzymes. Metabolism may be affected by liver enzyme inhibitors or inducers.
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Action
Phenazone is an NSAID.
Absorption: Absorbed from the GI tract. Peak plasma concentrations within 1-2 hr. Distribution: Throughout the body fluids; concentrations in the saliva and breast milk reaching about the same levels as those in plasma. Protein-binding: <10%. Metabolism: Hepatic; metabolised to 3 major metabolites. Excretion: Mainly via urine; via bile (small amount). Elimination half-life: About 12 hr. |
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Storage
Otic/Aural: Store below 25°C.
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ATC Classification
N02BB01 - phenazone ; Belongs to the class of pyrazolone preparations. Used to relieve pain and fever.
S02DA03 - phenazone ; Belongs to the class of analgesic and anesthetic agents used as otologicals. |
