Know the Science: How Medications and Supplements Can Interact

Test Your Knowledge: Are These Statements True or False?

Some supplements can decrease the effects of drugs.

True OR False

Actually, this is true.

You’re right.

For example, St. John’s wort can decrease the effectiveness of birth control pills, leading to breakthrough bleeding and an increased risk of unintended pregnancy.

Some supplements can increase the effects—including unwanted side effects—of drugs.

True OR False

You’re right.

Actually, this is true.

For example, herbs that decrease blood sugar may interact with anti-diabetes drugs to cause blood sugar to drop too far.

Some interactions between supplements and drugs are very dangerous.

True OR False

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Actually, this is true.

For example, interactions can decrease the effectiveness of critically important drugs—such as drugs that prevent transplanted organs from being rejected.

Scientists know a great deal about drug-supplement interactions.

True OR False

Actually, this is false.

You’re right.

For many drugs and supplements, there’s little information on possible interactions.