CYP2D6 is responsible for the metabolism and elimination of approximately 25% of clinically used drugs. Which SNPs do I need to check on 23andme in order to determine if I'm a poor or ultrarapid metabolizer of CYP2D6 substrates, and how reliable would the results be?
I've found one article on this topic, but I'm not sure how accurate it is, and it doesn't cite sources.
PS: why isn't this information more readily accessible to 23andme users, given the relatively large risks incurred by not knowing one's reaction to a large number of drugs?