Millions of people taking commonly prescribed medications are being warned that grapefruit, often found in juices, smoothies, and summer cocktails, can interfere with how their bodies process certain drugs, potentially causing serious side effects.

How Grapefruit Interacts with Medications

According to Dr. Nicole James, a physician based in Illinois, grapefruit contains natural compounds like furanocoumarins and flavonoids, which can interfere with an enzyme known as cytochrome P450 3A4, or CYP3A4. This enzyme helps the body break down many oral medications so they can be properly processed.

When grapefruit is ingested, it blocks this enzyme, causing medications that would normally be partially broken down in the digestive system to instead enter the bloodstream in larger amounts. This can lead to significantly higher-than-intended blood levels of the medication, increasing the risk of side effects.

Affected Medications and Precautions

Several categories of medications can be impacted by grapefruit consumption, including statins, blood pressure medications, sedatives, and certain antidepressants. Patients taking these medications should discuss grapefruit consumption with their healthcare providers and monitor for symptoms.

Health experts also remind patients that grapefruit is not the only food ingredient that can interfere with medications. Foods high in vitamin K, including leafy green vegetables and cranberry juice, can affect people taking warfarin, a blood thinner commonly prescribed to reduce the risk of heart attack and stroke.

Original reporting: WOWO News/Talk (Fort Wayne) — read the source article.