Abstract
Morphine hydrochloride (10 mg/kg, i.p.) induced marked catalepsy in rats, which was associated with significantly enhanced striatal acetylcholine levels and reduced cholinesterase activity. Rapid tolerance to morphine-induced catalepsy was noted after twice daily administrations, the tolerance being discernible after the third injection and was complete after the eleventh injection. With the development of tolerance, morphine-induced effects on striatal acetylcholine and cholinesterase were progressively reversed, confirming striatal cholinergic involvement in morphine-induced catalepsy in the rat.
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