respiratory system drug pathway sensory organ drug pathway opioid drug pathway ethylmorphine drug pathway 2016-02-22T15:38:55Z PW:0002525 The pharmacokinetics and pharmacodynamics pathway of ethylmorphine, an opiate narcotic analgesic mostly used to treat dry cough and as an ophtalmologic agent. Genetic variations can result in changes in drug availability and can cause differences in the response of the organism to the drug. pathway vpetri