Fevipiprant (INN; code name QAW039) is a drug being developed by Novartis which acts as a selective, orally available antagonist of the prostaglandin D2 receptor 2 (DP2 or CRTh2). Fevipiprant (INN; code name QAW039) is a drug being developed by Novartis which acts as a selective, orally available antagonist of the prostaglandin D2 receptor 2 (DP2 or CRTh2). As of 2016, it is in phase III clinical trials for the treatment of asthma.