I realize this answer is very, very late ... but may help someone in future.
Theoretically there is no drug interaction between birth control pills and Xenical (orlistat) BUT Xenical can cause diarrhea and this can affect the absorption of the pill and therefore affect the effectiveness.
- Xenical Information for Consumers
- Xenical Information for Healthcare Professionals (includes dosage details)
- Side Effects of Xenical (detailed)
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