 DUBLIN, Sept. 22, 2021 PRNewswire -- Endo International plc NASDAQ: ENDP announced today that one of its operating companies, Par Pharmaceutical, Inc. Par, has begun shipping the generic version of Pfizers Chantix varenicline, 0.5 mg and 1 mg tablets, following final approval from the U.S. Food and Drug Administration for its Abbreviated New Drug Application. 