Merck & Co., Inc. (NYSE:MRK) is one of the 8 Best Counter Cyclical Stocks to Buy Right Now. On April 21, 2026, Merck & Co., Inc. (NYSE:MRK) said the U.S. Food and Drug Administration approved Idvynso, a single-tablet regimen combining 100 mg doravirine and 0.25 mg islatravir, for the treatment of HIV-1 infection in adults. The therapy is intended to replace a current antiretroviral regimen in patients who are virologically suppressed on a stable regimen, with no history of treatment failure and no known r ...