Pulmonary Arterial Hypertension (IMAGE) Bentham Science Publishers Caption Researchers have designed formulations of controlled release microspheres which release the medicine over a prolonged period of time and thereby reduce the number of doses a patient needs to take. Credit Bentham Science Publishers Usage Restrictions None 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.