Engaging Students in Pharmacogenetics: Patient Case Studies Using the PharmGKB Website.

Cytochrome P450 (CYP) enzymes are important regulators of drug efficacy and toxicity. Genetic variation in isoforms can impact how well patients respond to medications or experience unwanted toxicities. PharmGKB is an online pharmacogenomics resource that collates the latest data and clinical guidelines on genetic variation and drug responses.