Covis Pharmaceuticals, Inc. BrandsUpdated: November 8, 2013 Covis Pharmaceuticals, Inc. manufacturers the following brands:Fortaz Lanoxin Nilandron Parnate Plaquenil Rilutek Xatral Zantac GenericsBack to TopCovis Pharmaceuticals, Inc. manufacturers the following generics:Alfuzosin Ceftazidime Digoxin Hydroxychloroquine Nilutamide Ranitidine Riluzole Tranylcypromine