Which herb has been found to inhibit the action of oral contraceptives?

Question

Quizplus · Accepted Answer

St. John's wort is known to decrease the effectiveness of many drugs, including oral contraceptives, by inducing the enzymes that metabolize these drugs in the liver, which can lead to a reduced serum concentration of the drug and hence decreased efficacy. Garlic, ginseng, and kava have not been found to interfere with oral contraceptives. St. John's wort has been found to induce the metabolism of oral contraceptives by increasing the activity of certain liver enzymes, resulting in decreased efficacy of the contraceptives. Therefore, it is not recommended to take St. John's wort while using oral contraceptives. Garlic, ginseng, and kava do not have a known significant interaction with oral contraceptives.

Which Herb Has Been Found to Inhibit the Action of Oral