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Interactions Between Food and Drugs Could Lower Drug Costs

Exploiting interactions between food and drugs could dramatically lower the rapidly rising costs of several anticancer drugs, and perhaps many other medications, according to cancer-pharmacology specialists.

University of Chicago oncologists Mark Ratain, MD, and Ezra Cohen, MD, call attention to the flip side of recent studies showing how certain foods can alter absorption or delay breakdown of precisely targeted anti-cancer drugs.

Instead of seeing such studies as highlighting a dosing problem, Ratain and Cohen argue that results like this one should point researchers toward a partial solution, a novel way to decrease medication costs while increasing benefits from these effective but expensive drugs.

The commentary was inspired by a study presented in June at the American Society for Clinical Oncology. Researchers from Dartmouth showed that taking the breast cancer drug lapatinib (TYKERB) with foodinstead of on an empty stomach as suggested on the labelresulted in more of the drug being absorbed and available to treat the cancer.

Patients currently take five 250 mg lapatinib tablets on an empty stomach. The study found that taking the drug with a meal increased the bioavailability of the drug by 167 percent. Taking the drug with a high-fat meal boosted levels by 325 percent.

"Simply by changing the timing, taking this medication with a meal instead of on an empty stomach, we could potentially use 40 percent (or even less) of the drug," said Ratain. "Since lapatinib costs about $2,900 a month, this could save each patient $1,740 or more a month."

Topping off that meal with grapefruit juice, "which may also increase plasma concentrations" according to the package insert, could increase the savings to 80 percent, the authors suggest, "minus the cost of the food and juice."

"We expect the one 250 mg lapatinib pill accompanied by food and washed down with a glass of grapefru
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