Revised SPC: Xonvea (doxylamine succinate, pyridoxine hydrochloride) 10mg/10mg gastro-resistant tablets

Sections 4.4 and 4.5 warn there have been reports of false positive urine screening tests for methadone, opiates, and phencyclidine phosphate (PCP) with doxylamine succinate/pyridoxine hydrochloride use.

Source:

electronic Medicines compendium