Metaxalone
 Mechanism : 
Metaxalone is a muscle relaxant. It works by blocking nerve impulses (or pain sensations) in the brain.
 Indication : 
- Muscle spasm
- Systemic sclerosis
- Cardiac allograft rejection
 Contraindications : 
Hypersensitivity to drug/class/component, Anaemia.
Dosing : 
Muscle spasm: 12 years or above: 800 mg orally for 3 to 4 times a day. Give on empty stomach.
 Adverse Effect : 
Common Reactions: Drowsiness, somnolence, dizziness, headache, nervousness, nausea, vomiting, dyspepsia. 
Serious Reactions: Hemolytic anemia, leukopenia, anaphylaxis.
 Interaction : 
Triprolidine: The CNS depressants, Triprolidine and Metaxalone, may increase adverse/toxic effects due to additivity. Monitor for increased CNS depressant effects during concomitant therapy.
 Hepatic Dose : 
Mild to moderate hepatic impairment: Use with caution. Monitor with serial liver function tests (LFTs). 
Severe hepatic impairment: Use is contraindicated.