Overview
Pangesic (Forte Pangesic in Jordan) is a combination analgesic medication containing paracetamol (acetaminophen) and orphenadrine citrate. It is primarily used for the relief of moderate to severe pain, particularly when associated with muscle spasms or tension. The combination provides both analgesic and muscle relaxant effects through different mechanisms.
Mechanism of Action
Paracetamol acts centrally as an analgesic and antipyretic through inhibition of prostaglandin synthesis in the CNS, with weak peripheral anti-inflammatory effects. Orphenadrine citrate is a centrally-acting skeletal muscle relaxant with anticholinergic properties that acts at the brainstem and spinal cord levels to reduce muscle spasm and rigidity.
Indications
- Relief of moderate to severe pain associated with muscle spasms
- Musculoskeletal conditions with pain and spasm
- Post-traumatic pain with muscle spasm
- Post-operative pain with muscle tension
Dosage
Adults: 1-2 tablets every 6-8 hours as needed for pain. Maximum daily dose should not exceed 8 tablets (typically containing 450 mg orphenadrine citrate and 3,000 mg paracetamol total). Elderly patients may require lower doses. Duration of treatment should be limited to the shortest period necessary.
Contraindications
- Hypersensitivity to paracetamol, orphenadrine, or any component
- Severe liver impairment
- Myasthenia gravis
- Glaucoma (narrow-angle)
- Prostatic hypertrophy with urinary retention
- Pyloric or duodenal obstruction
- Achalasia
- Concurrent use with monoamine oxidase inhibitors (MAOIs)
Side Effects
- Drowsiness
- Dry mouth
- Blurred vision
- Constipation
- Urinary retention
- Dizziness
- Nausea
- Headache
- Tachycardia
- Hypotension
- Allergic reactions
- Hepatotoxicity (with overdose)
Interactions
- Alcohol: Increased risk of hepatotoxicity
- Anticholinergic drugs: Enhanced anticholinergic effects
- CNS depressants: Enhanced sedation
- Warfarin: Possible increased anticoagulant effect
- MAOIs: Hypertensive crisis
- Serotonergic drugs: Risk of serotonin syndrome
- Cholestyramine: Reduced paracetamol absorption