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. 1992 Nov;34(5):431-3.
doi: 10.1111/j.1365-2125.1992.tb05651.x.

Plasma morphine-3-glucuronide, morphine-6-glucuronide and morphine concentrations in patients receiving long-term epidural morphine

J J Schneider  1 , P J Ravenscroft, J D Cavenagh, A M Brown, J P Bradley
Affiliations

Plasma morphine-3-glucuronide, morphine-6-glucuronide and morphine concentrations in patients receiving long-term epidural morphine

J J Schneider et al. Br J Clin Pharmacol. 1992 Nov.

Abstract

Plasma morphine concentrations were measured in five cancer patients receiving long-term epidural morphine administration. Peak concentrations were observed within 1 h of dosage and concentrations then declined biexponentially. Plasma morphine-3-glucuronide (M3G) and morphine-6-glucuronide (M6G) concentrations were measured in two patients and plasma M3G concentrations were observed to be much higher than plasma M6G and morphine concentrations. Peak plasma M6G concentrations occurred within 1.0 h of dosing and plasma M6G concentrations then remained higher than plasma morphine concentrations.

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