Pyrantel impurity A - 1-methyl-2-[(Z)-2-(thiophen-2-yl)ethenyl]-1,4,5,6-tetrahydropyrimidine

Pyrantel impurity D - (1,2-Dimethyl-1,4,5,6,-tetrahydropyrimidine)

Pyrazinamide

Pyridostigmine bromide

Pyridostigmine impurity A - Pyridin-3-yl-dimethylcarbamate

Pyridostigmine impurity B - 3-hydroxy-1-methylpyridinium

Pyridoxine hydrochloride

Pyridoxine impurity A - 6-methyl-1,3-dihydrofuro[3,4-c]pyridin-7-ol

Pyrimethamine

Pyrrolidone