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A number of studies reported striking differences in antinociceptive responses to morphine as a function of sex. Although sex differences in the sensitivity to morphine are widely characterized in rodents, the underlying causes are not identified. Gonadal steroids are believed to contribute to sex differences in response to opioid-induced antinociception. In rats, morphine is metabolized by glucuronidation...
Plasma and cerebrospinal fluid (CSF) steady-state concentrations (Css) of morphine (M) and the main metabolites morphine-3-glucuronide (M3G) and morphine-6-glucuronide (M6G), were determined by high performance liquid chromatography (HPLC) in 21 cancer patients treated with chronic subcutaneous morphine infusion. There was a moderate, but statistically significant correlation between the daily dose...
In 34 cancer patients treated with chronic slow-release oral morphine, plasma and cerebrospinal fluid (CSF) minimum steady-state concentrations of morphine (M), morpine-3-glucuronide (M3G) and morphine-6-glucuronide (M6G) were determined by high-performance liquid chromatography (HPLC). Both plasma and CSF morphine, M3G and M6G, concentrations were linearly related to dose of morphine. At steady...
Antinociceptive tolerance to morphine (MOR) was induced in groups of Sprague-Dawley rats receiving continuous intravenous infusions of morphine sulphate administered by 3 different MOR dosing regimes. At appropriate intervals throughout each infusion period, antinociceptive testing was performed using the tail-flick latency test and blood samples were collected. Groups of saline (SAL)-infused control...
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