Hi - I have never seen any research to show that IBS affects hormones. But, logically anything that physically stresses your body, like an IBS attack, could then affect hormonal issues as well if they respond to stressors. For example, having a bad bout of IBS could certainly contribute to a bad round of menstrual cramps.
I'm not at all sure how this would play in to hormonal medications that are affecting things. Thyroid meds can also really affect IBS.
You might call your pharmacist and ask for some advice as well - they often have better medication info and feedback from patients than the docs do. XXOO Heather