Hypersensitivity. Serum K level >5.5 mEq/L at initiation. Co-administration w/ strong CYP3A inhibitors (eg, ketoconazole, itraconazole, nefazodone, troleandomycin, clarithromycin, ritonavir, & nelfinavir); ACE inhibitor & ARBs. CrCl ≤30 mL/min. Severe hepatic insufficiency (Child-Pugh class C). HTN: Type 2 diabetes w/ microalbuminuria. Co-administration of K supplements or K sparing diuretics (eg, amiloride, spironolactone, or triamterene). Serum creatinine >2 mg/dL in males or >1.8 mg/dL in females. CrCl <50 mL/min.