opioid drug pathway levacetylmethadol drug pathway 2016-03-02T08:31:34Z <new synonym> PW:0002551 The pharmacokinetics and pharmacodynamics pathway of levacetylmethadol, a synthetic opioid, similar in structure to methadone, used for the treatment and management of opioid dependence. Genetic variations can result in changes in drug availability and can cause differences in the response of the organism to the drug. levomethadyl acetate drug pathway pathway vpetri