St. John's wort can interfere with oral contraceptives

July 2003

There's now more evidence that St. John's wort can interfere with oral contraceptives...and lead to unintended pregnancies.

St. John's wort increases the metabolism of ethinyl estradiol...and seems to reduce the effectiveness of OCs.

Some women have breakthrough bleeding when taking St. John's wort and OCs together.

Get concise advice on drug therapy, plus unlimited access to CE

Pharmacist's Letter membership benefits include:

12 issues every year — what you need to know and do, right now
Quick, practical reference charts and tools
Comprehensive CE library to meet license renewal and state requirements
Multiple course formats including live webinars, podcasts, and CE-in-the-Letter to match your learning style
Plus much more!

Choose the right tier for your needs today.

Already a subscriber? Log in

Volume pricing available. Get a quote