What Causes Flatulence While On Lopressor, Zocor And Aspirin?

Hello Dr. M., I take a few different medications since I had 5 TIA s, but I have now added Fish Oil and Biotin as a supplement. Here is my dilemma, I am always farting thru out the day. My meds are HCTZ, Prinvil, Lopressor, Zocor, Aspirin and Iron. What is doing it and what can I do to make it less of an issue. Thank you.