Figure 1.
Schematic representation of the structural pharmacokinetic model for morphine and its glucuronides. CLMORPHINE, total morphine clearance; Q, intercompartment morphine clearance; V1, central volume of morphine; V2, peripheral volume of morphine; FMET3, fraction metabolized to morphine-3-glucuronide; FMET6, fraction metabolized to morphine-6-glucuronide; ClO, morphine clearance by routes other than glucuronidation (calculated); CLM3G, elimination clearance of morphine-3-glucuronide; CLM6G, elimination clearance of morphine-6-glucuronide; VM3G, volume of morphine-3-glucuronide (fixed); VM6G, volume of morphine-6-glucuronide (fixed).