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. 2018 Jan 30;8(1):8. doi: 10.3390/jpm8010008

Table 2.

Assignment of likely CYP2C19 phenotypes based on genotypes. Adapted from [68], used with permission of John Wiley and Sons; copyright 2013.

Phenotype Example Genotypes Enzyme Activity
Ultra-rapid metabolizer (UM) *1/*17 Normal or increased
*17/*17
Extensive metabolizer (EM) *1/*1 (wild type) Normal
Intermediate metabolizer (IM) *1/*2 Intermediate
*1/*3
*2/*17 Likely intermediate
*3/17 Likely intermediate
Poor metabolizer (PM) *2/*2 Low or absent
*3/*3
*2/*3