When supplied concomitantly with promethazine, the dose of barbiturates need to be lessened by not less than one-50 %, as well as dose of narcotics need to be lessened by a person-quarter to at least one-50 %. Dosage has to be individualized. Too much amounts of promethazine HCl relative into https://wockusa.com/product/tris-promethazine-hcl-and-codeine-phosphate-oral-solution/