Abstract
The fate of [35S]-phenothiazine, a veterinary anthelmintic, has been investigated in the adult male marmoset (Callithrix jacchus) following oral administration. A near complete recovery of radioactivity (c. 95%) was achieved in 0-3 days, with just over one-third of the dose (c. 37%) being present in the urine and the remainder (c. 58%) being accounted for in the faeces. The majority of the urinary radioactivity (c. 91%) was present as conjugates, tentatively identified as phenothiazine N-glucuronide and leucophenothiazone sulphate. Smaller amounts of phenothiazone, thionol, phenothiazine sulphoxide and unchanged phenothiazine were also identified. The only compound identified in the faeces was unchanged phenothiazine.
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