Klor-Con (potassium chloride) is prescribed to prevent or treat low potassium levels, often caused by loop or thiazide diuretics like Lasix (furosemide) or hydrochlorothiazide.

• Lasix (furosemide) is a loop diuretic.

• Zestril (lisinopril) is an ACE inhibitor.

• Norvasc (amlodipine) is a calcium channel blocker.

DEA Form 222 is used to order Schedule I and II controlled substances.

Schedule III and IV prescriptions may be refilled up to 5 times in 6 months under federal law; Schedule V is often governed differently depending on the substance and product, but this is the classic federal refill rule tested for III-IV.