Eliquis— Used to treat and prevent blood clots, the Pfizer and Bristol-Myers Squibb drug Eliquis was the 48th most-prescribed medication in the United States in 2020. The generic version of the medication, apixaban, is not available in the U.S. after Bristol Myers Squibb and Pfizer had their patent claims upheld by a court, protecting their exclusivity until 2028. The two companies filed another lawsuit to block copies of Eliquis in federal court in Delaware in April. The list price for a 30-day supply is $561.