Buy Wockhardt Promethazine Codeine Cough Syrup — Global Chem Market. Wockhardt Promethazine Codeine Cough Syrup is a prescription cough medicine containing promethazine and codeine. Promethazine is an antihistamine with sedating properties, while codeine is an opioid that can suppress the cough reflex. The combination has been used in certain prescription cough formulations.