Posted in Web Erythromycin: update on known risk of infantile … January 9, 2021 Infantile hypertrophic pyloric stenosis is characterised by hypotrophy and subsequent narrowing of the pylorus between the stomach and duodenum. Signs and symptoms in infants can include vomiting … https://www.gov.uk/drug-safety-update/erythromycin-update-on-known-risk-of-infantile-hypertrophic-pyloric-stenosis