The pharmacokinetics of codeine and its metabolites in Blacks with sickle cell disease.
OBJECTIVE
We conducted a prospective, open-label study in 54 adult subjects with sickle cell disease to determine the relationship between morphine concentrations, cytochrome P450 (CYP) 2D6 genotype, and clinical outcomes.


METHODS
A blood sample was obtained for genotyping and serial blood samples were drawn to measure codeine and its metabolites in the plasma before and after oral codeine sulfate 30 mg. Codeine and its metabolites were measured by liquid chromatography-tandem mass spectrometry (LC-MS). CYP2D6 genetic testing included four single nucleotide polymorphisms (SNP) indicative of three variant alleles: *17 (1023T); *29 (1659A, 3183A); and *41 (2988A) alleles.


RESULTS
Thirty subjects (group I) had a mean (standard deviation) maximal morphine concentration of 2.0 (1.0) ng/ml. Morphine was not measurable in the remaining 24 subjects (group II). Nine (30%) subjects in group I and 11 (46%) subjects in group II carried a variant *17, *29, or *41 allele (p = 0.23); one (3%) subject in group I and 5 (21%) subjects in group II were homozygous for *17 or *29 allele (p = 0.07). Emergency room visits (group I 1.5 +/- 1.8 vs. group II 2.1 +/- 4.3, p = NS) did not differ based on metabolic status, but more hospital admissions (0.9 +/- 1.4 vs. 2.2 +/- 4.1, p = 0.05) were documented in patients with no measurable morphine concentrations.


CONCLUSIONS
We conclude that Blacks with sickle cell disease without measurable plasma morphine levels after a single dose of codeine were not more likely to be a carrier of a single variant allele commonly associated with reduced CYP2D6 metabolic capacity; however, homozygosity for a variant CYP2D6 allele may result in reduced metabolic capacity. Furthermore, it appears that subjects without measurable morphine concentrations were more likely to be admitted to the hospital for an acute pain crisis.
Shord
Stacy S
SS
Department of Pharmacy Practice, University of Illinois, College of Pharmacy (MC 886), 833 S Wood Street, Room 164, Chicago, IL 60612, USA. sshord@uic.edu
Cavallari
Larisa H
LH
Gao
Weihua
W
Jeong
Hyun-Young
HY
Deyo
Kelly
K
Patel
Shitalben R
SR
Camp
Joseph R
JR
Labott
Susan M
SM
Molokie
Robert E
RE
D000328:Adult; D000483:Alleles; D000701:Analgesics, Opioid / Q000737:chemistry / Q000378:metabolism / Q000493:pharmacokinetics*; D000755:Anemia, Sickle Cell / Q000235:genetics*; D019540:Area Under Curve; D044383:Black People / Q000706:statistics & numerical data*; D003061:Codeine / Q000737:chemistry / Q000493:pharmacokinetics*; D019389:Cytochrome P-450 CYP2D6 / Q000235:genetics / Q000378:metabolism; D005260:Female; D005838:Genotype; D006207:Half-Life; D006579:Heterozygote; D006720:Homozygote; D006801:Humans; D008297:Male; D008657:Metabolic Clearance Rate; D015394:Molecular Structure; D009020:Morphine / Q000737:chemistry / Q000493:pharmacokinetics*; D020641:Polymorphism, Single Nucleotide; D011446:Prospective Studies; D012016:Reference Values
D000701:Analgesics, Opioid; D009020:Morphine; D019389:Cytochrome P-450 CYP2D6; D003061:Codeine