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“In mice ascorbate , when co-administered with morphine , suppresses the development of tolerance and physical dependence on the drug, without significantly affecting its analgesic properties as inferred from unaltered ED50 values.”
“ Morphine administration increased the striatal levels of DA metabolites, UA and DHAA and the extracellular concentrations of DA, DOPAC + HVA, UA and AA.”
“ Ascorbate doses over 8 mg/kg also protected mice from lethal doses of morphine.”
“Oral administration of single doses of ascorbate produced a decrease in the analgesic effect of morphine in mice when assayed by the tail-flick test.”