UEG Week Barcelona 2019 (IMAGE) Spink Health Caption The drug categories found to have the biggest impact on the microbiome include, proton pump inhibitors (PPIs), metformin, antibiotics and laxatives. Credit UEG Usage Restrictions UEG License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.