5.4 potassium level i had blood test for surgery and all were normal range except k how can i lower my potassium?

It depends: on whether the high potassium level is because of kidney disease, medications (like lisinopril and losartan for BP or potassium supplements), endocrine disease (like hypoaldosteronism) or obstruction. There are medications to lower potassium but they are typically used in the hospital setting only, not for home. If you are eating high potassium foods, you should stop. Diuretics also help lower