In vitro studies indicate that irbesartan is primarily oxidised by the cytochrome P450 enzyme CYP2C9; isoenzyme CYP3A4 has negligible effect.
In vitro uuringud näitavad, et irbesartaan oksüdeeritakse esmalt tsütokroom P450 ensüümi CYP2C9 poolt; isoensüüm CYP3A4 toime on ebaoluline.