Endomorphin Painkiller (IMAGE) Tulane University Caption Researchers at Tulane University and Southeast Louisiana Veterans Health Care System have developed a painkiller that is as strong as morphine but isn't likely to be addictive and with fewer side effects, according to a new preclinical study. The peptide-based drugs (above) target the same pain-relieving opioid receptor as morphine. Credit Photo by Paula Burch-Celentano, Tulane University. Usage Restrictions Please include attribution. 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.