May increase serum levels of quinidine. Al(OH)
3: Decreased absorption w/ tetracyclines, digoxin & vit. May prevent proper absorption of H
2-antagonists, atenolol, chloroquine, cyclines, diflunisal, digoxin, diphosphonates, ethambutol, fluoroquinolones, Na fluorine, glucocorticoids, indomethacin, INH, kayexalate, ketoconazole, lincosamides, metoprolol, neuroleptics, phenothiazines, penicillamine, propranolol, Fe salts.