Abstract
Endogenous codeine and morphine in poor and extensive metabolisers of the CYP2D6 (debrisoquine/sparteine) polymorphism.
G Mikus, F Bochner, M Eichelbaum, P Horak, A A Somogyi and S Spector
Journal of Pharmacology and Experimental Therapeutics February 1994, 268 (2) 546-551;