The only listed interactions Orlistat has with other medications is a heart rhythm control medication known as Amiodarone, a thyroid medication known as Levothyroxine, Fat soluble vitamins, and the blood thinner known as
Warfarin. Additionally, if you have taken Orlistat
and oral contraceptive pills before with no changes the likelihood of the combination having an effect on your cycle this month is very small. I would consult your OB/GYN or your regular physician about your concern.