following administration of codeine phosphate ( 60 mg ) in combination with aspirin ( 650 mg ) or acetaminophen ( 600 mg ) to two separate groups , mean peak codeine plasma concentrations and beta-phase elimination half-lives were 159 ng/ml and 2.9 hr or 138 ng/ml and 2.4 hr , respectively .
C0009217
codeine phosphate
C0009214
codeine