Drugs that increase the serum digoxin concentration by reducing clearance or volume of distribution:
	Alprazolam (Xanax)
	Amiodarone (Cordarone)
	Indomethacin (Indocin)
	Propafenone (Rythmol)
	Quinidine
	Verapamil (Calan)
Drugs that increase the serum digoxin concentration by reducing inactivation by bacterial metabolism in the intestines:
	Clarithromycin (Biaxin)
	Erythromycin
	Tetracycline
Drugs that increase the serum digoxin concentration by decreasing intestinal motility and increasing absorption:
	Diphenoxylate (with atropine; Lomotil)
	Propantheline (Pro-Banthine)
Drugs that decrease the serum digoxin concentration by decreasing absorption:
	Antacids
	Cholestyramine (Questran)
	Metoclopramide (Reglan)
	Neomycin
Drugs that decrease the serum digoxin concentration by increasing nonrenal clearance:
	Rifampin (Rifadin)