Expert answer:
Xenical or Orlistat does not absorb anything, much less fat, it is a lipase inhibitor (the fat digestion enzyme in the intestine) because the fats are not digested, they can not be absorbed and are eliminated in the feces. Xenical or Orlistat does not decrease the effect of contraceptive. Second, the description of the medicine (package insert), there seems to be no risk in using the two together.
