On the Dow today, the blue chips' two drugmakers posted earnings reports. First, Merck ( MRK 1.11% ) shares finished down 0.6%, as the Singulair-maker continued to see a drop in revenue because of patent expirations and generic competition. Sales fell 11% to $11.01 billion, which missed analyst estimates of $11.24 billion, but adjusted earnings per share of $0.84 managed to beat the consensus view at $0.82. Much of the revenue decline was due to an 80% fall in asthma-drug Singulair to $281 million as it came off patent last August. Merck held its EPS forecast in place but lowered its revenue projection, saying it expects a decline of 5% to 6% for the full year.