Washington State Veterinary Medication Clerk Practice Test

Muscle relaxants decrease skeletal muscle tone to relieve spasm and pain. Methocarbamol is a central-acting skeletal muscle relaxant; it works by depressing nerve impulses in the CNS, which helps reduce muscle spasm and rigidity. This makes it useful for supporting recovery after injuries or surgeries and for conditions with muscle spasm.

The other drugs listed don’t act as muscle relaxants: Dibenzyline (phenoxybenzamine) is an alpha-adrenergic blocker used to manage certain cardiovascular issues like pheochromocytoma, not muscle relaxation. Levothyroxine is a thyroid hormone replacement used for hypothyroidism, and insulin is a hormone used to control blood glucose in diabetes.