"When we think of drug interactions, specifically, the National Cancer Institute actually defines this as a change in the way a drug acts in the body when taken with certain other drugs, herbals, or foods or when taken with certain medical conditions. Drug interactions may cause the drug to either be more or less effective or cause effects on the body that are not expected," Carissa Ganihong, PharmD, BCOP, oncology and bone marrow transplantation clinical pharmacist at Hackensack University Medical Center in New Jersey, told Jaime Weimer, MSN, RN, AGCNS-BS, AOCNS®, manager of oncology nursing practice at ONS, during a conversation about interaction pathways.

Music Credit: "Fireflies and Stardust" by Kevin MacLeod

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Learning outcome: Learners will report increased knowledge related to drug interactions in oncology care.

Episode Notes

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Highlights From This Episode

"One of the most notable food interactions that interacts with many different medications is actually grapefruit or grapefruit juice. This is known to be a very strong CYP3A4 inhibitor. … A lot of medications are metabolized through the CYP3A4 pathway. By inhibiting the effect of these enzymes, that can actually increase and significantly increase the concentrations of these therapies. It's not an interaction that's just limited to grapefruit. I would say grapefruit being in the food interaction is kind of one of the most well-known, but it can also be seen with other foods as well, like pomegranate juice or a very specific type of orange called Seville oranges. And this is really just due to the presence of a substance called furanocoumarins." TS 6:12

"There have been a pretty large number of genes identified that are responsible for coding some of those common enzyme families that I had been discussing, some of those CYP450 enzymes, but other enzymes as well that are important for drug metabolism. Based on the type of gene, there could be some different categories where patients are normal metabolizers, intermediate metabolizers, or poor metabolizers. There are some other categories as well based on the type of gene we're looking at. And that can ultimately impact the way you are able to metabolize drugs." TS 15:56