Vit C: Increased absorption of Fe. Increased urinary excretion w/ aspirin. Decreased excretion of aspirin. Prolonged presence of paracetamol in the blood. Not compatible in soln w/ aminophylline, bleomycin, erythromycin, lactobionate, nafcillin, Na nitrofurantoin, conjugated estrogens, Na bicarbonate, sulfafurazole, diethanolamine, chloramphenicol Na succinate, chlorothiazide Na & hydrocortisone Na succinate. Interfere w/ blood-thinning treatments. Zn: Interactions w/ cephalosporins; β-lactam antibiotics; tetracyclines; antiretroviral drugs like atazanavir, ritonavir; antineoplastic agents like cisplatin; antidiabetic drugs like glimepiride, glyburide, pioglitazone, insulin; & K-sparing diuretics like amiloride. Vit D
3: Avoid taking w/ paricalcitol, calcipotriene, doxercalciferol, mineral oil. May decrease or prevent absorption w/ orlistat, or bile acid sequestrants like colesevelam, colestipol, cholestyramine. Digoxin; Al hydroxide; water pills like chlorthalidone, hydrochlorothiazide, & chlorothiazide; Mg hydroxide & Mg citrate; & fosphenytoin.