How are drug interactions with ACEI?

 Potassium supplements, potassium-sparing diuretics, salt substitutes, or other drugs that increase potassium levels with ACE inhibitors may result in excessive blood potassium levels because ACE inhibitors can further increase potassium totoxic levels.  NSAIDs drugs may reduce the blood pressure-lowering effects of ACE inhibitors.  Diuretics: Hypotension  Lithium:ACE inhibitors increase the reabsorption of lithium