MERCK & CO INC revenue for the last year amounted to 1.34 T MXN, the most of which — 1.20 T MXN — came from its highest performing source at the moment, Pharmaceutical, the year earlier bringing 910.11 B MXN. The greatest contribution to the revenue figure was made by United States — last year it brought MERCK & CO INC 672.96 B MXN, and the year before that — 483.74 B MXN.