||||||||||Prevymis (letermovir) / Merck (MSD) Clinical Trial,Phase I, Clinical Trial,Phase II, Clinical Trial,Phase III, Journal: Letermovir Prophylaxis for Cytomegalovirus in Hematopoietic-Cell Transplantation. (Pubmed Central) - Jan 9, 2018 P3 Adverse events with letermovir were mainly of low grade. (Funded by Merck; ClinicalTrials.gov number, NCT02137772 ; EudraCT number, 2013-003831-31 .).