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4-Phenylpiperidine-4-carboxylic acid is used to prepare CB1 antagonists with lowered propensity to pass the blood-brain-barrier. It is also used to synthesize 4,4-disubstituted piperidines as NK1 antagonists.
1.An X-ray study on the acute action of diphenoxylate on the intestinal motility in volunteers.
Ylitalo P, Svinhufvud U, Anttila P, Laasonen L, Gothoni G. Arzneimittelforschung. 1975 Jul;25(7):1081-2.
The intestinal inhibitory activity of 1-(3-cyano-3,3-diphenylpropyl)-4-phenyl-4-piperidine-carboxylic acid ethyl ester (diphenoxylate) after a single oral dose of 5 mg was studied in 10 volunteers with X-ray diagnostic methods. The diphenoxylate treatment lengthened the transit time of the barium sulphate to caecum from 3.2 to 4.3 h. The X-ray cinematography showed the slower duodenal emptying in 5/10 of the subjects, but only in 1 of these the velocity of the peristaltic wave was clearly decreased. The results demonstrate directly the acute inhibitory action of diphenoxylate on intestinal motility with the dose used generally 3--4 times daily for the symptomatic treatment of diarrhoea.
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