Robinax 500mg(Methocarbamol): Uses, Content, indications, Contraindications, Dosage, Side Effects, Price
Each uncoated tablet of robinax contains:
Methocarbamol USP 500mg
ROBINAX is indicated as an adjunctive therapy for the relief of discomfort associated with acute painful musculoskeletal conditions.
ROBINAX is also indicated for control of muscle spasm in tetanus.
DOSAGE & ADMINISTRATION
Oral: Initial: 1.5gm (i.e 3 tablets) 4 times daily.
Maintenance: 1gm (2 tablets) 4 times daily.
For the first time 48 to 72 hours, 6gm/day is recommended. (For severe conditions 8 gm daily may be administered). Thereafter reduce to approximately 4 gm daily.
Methocarbamol is a centrally acting skeletal muscle relaxant. Its mechanism of action has not been established, but may be due to general CNS depression. The drug has no direct action on the contractile mechanism of striated muscle, motor endplate or nerve fiber, it does not directly relax tense skeletal muscles.
Methocarbamol is rapidly absorbed from the gastro intestinal tract following oral administration. Methocarbamol has an onset of action of 30 minutes. Peak plasma levels occur approximately 2 hours after administration of 2gm. The half life is from 1 to 2 hours. Methocarbamol is metabolised, probably in the liver and excreted in urine primarily as the glucuronide and sulphate conjugates of its metabolites. A small amount is excreted in faeces.
ADVERSE REACTIONS AND SIDE EFFECTS
Oral – Lightheadedness, dizziness, nausea, urticaria, pruritus, rash conjunctivitis with nasal congestion, blurred vision, headache, fever.
PRECAUTIONS & WARNINGS
a) Methocarbamol may impair concentration; patients so affected should not drive or operate machinery.
b) Methocarbamol is not recommended during pregnancy, especially during early pregnancy or in women who may become pregnant, unless potential benefits outweigh potential hazards.
c) It is not known whether Methocarbamol is excreted in breast milk. Exercise caution when administering to nursing women.
d) Safety and efficacy of Methocarbamol in children below 12 yrs old has not been established, except in tetanus.
Overdosage often in conjunction with alcohol or other CNS depressants, is marked by coma and other signs of CNS depression.
TREATMENT OF OVERDOSE
Treatment is essentially supportive. Simple isolated seizures may require only observation and supportivecare. Repetitive seizures or status epilepticus require therapy. Diazepam i.v is generally the agent of choice, parenteral barbiturates have also been used.
Methocarbamol is contraindicated in hypersensitive patients, in coma or pre-coma states, brain damage, myasthenia gravis or in patients with a history of epilepsy.
Methocarbamol should not be administered to patients with known or suspected renal pathology.
The CNS effects of Methocarbamol may be potentiated by concomitant administration of other CNS depressants, such as alcohol.
Methocarbamol has also been stated to potentiate the effects of anorectics, antimuscarinics and some psychotropic agents.
Methocarbamol may cause a colour interference in certain screening tests for 5 hydroxy indole acetic acid (5-HIAA) and vanillyImandelic acid (VMA).
A pack of robinax containing 10 tablets cost about #2,500 naira ($5) in Nigeria.
Store in a cool dry place.
Keep out of reach of children.
#ROBINAX Tablets: Blister of 10 tablets.
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