A  woman is prescribed codeine for postoperative pain follow…

A  woman is prescribed codeine for postoperative pain following a cholecystectomy. After taking her first few doses, she reports severe dizziness and nausea, and her husband notes that she seems “overly sedated.” Genetic testing later reveals that she is a CYP2D6 ultrarapid metabolizer. Which of the following best explains her symptoms? (SELECT ALL THAT APPLY)