Cigarette cigarette smoking decreases levels of promethazine by escalating metabolism. Use Warning/Keep track of. Interaction primarily seen w/chlorpromazine & thioridazine, but could take place w/other phenothiazines. promethazine boosts effects of daxibotulinumtoxinA by pharmacodynamic synergism. Use Warning/Keep track of. Drugs with anticholinergic effects could potentiate botulinu... https://wockusa.com/product-category/research-chemicals/