Abstract
β-Carotene was found to potentiate morphine analgesia in hot plate experiments using mice. Response time was increased by about 100%, and the duration of analgesia was markedly prolonged. These features of β-carotene were a function of the intact molecule, although the closely related compound, α-carotene, also exhibited this property. β-Carotene alone had no effect on the nociceptive response. Other compounds with related structures, metabolic products, or anti-oxidants neither augmented nor antagonized morphine action.
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