- Current use of anticoagulants (e.g. warfarin, heparin) at therapeutic levels within seven days prior to the first dose of GSK1120212. Low dose (prophylactic) low molecular weight heparin (LMWH) is permitted provided that subject's PT and PTT meet entry criteria. Subjects required therapeutic levels of LMWH must receive approval from GSK Medical Monitor and monitored appropriately as clinically indicated.