Does phenergan show up in an drug test?

Phenergan is the first generation anti-histamine, chemically known as promethazine. it has an anti-emetic effect and mostly used as sedative drug. It blocks the H1 receptor cells. Because of huge side effects that it poses in body, it has ban in prohibited for administration by doctors. It leads to respiratory dis orders and metabolically active for longer durations. However they do show up in drug tests.