https://www.ncbi.nlm.nih.gov/pubmed/31474120?dopt=Abstract https://www.ncbi.nlm.nih.gov/pubmed/31474120?dopt=Abstract Ensifentrine (RPL554): an investigational PDE3/4 inhibitor for the treatment of COPD. Related Articles Ensifentrine (RPL554): an investigational PDE3/4 inhibitor for the treatment of COPD. Expert Opin Investig Drugs. 2019 Sep 01;:1-7 Authors: Cazzola M, Calzetta L, Rogliani P, Matera MG Abstract Introduction: A compound that simultaneously inhibits PDE3 and PDE4 should increase airway […]