Concurrent intake of more than 200 mg of Ascorbic acid per 300 mg of elemental iron would increase absorption of iron from the intestines. Increased urinary excretion of Ascorbic acid and decreased excretion of aspirin occur when taken these drugs together. Taking Ascorbic acid with paracetamol can prolong the presence of paracetamol in the blood. Ascorbic acid is not compatible in solution with drugs like aminophylline, bleomycin, erythromycin, lactobionate, nafcillin, sodium nitrofurantoin, conjugated estrogens, sodium bicarbonate, sulfafurazole, diethanolamine, chloramphenicol sodium succinate, chlorothiazide sodium and hydrocortisone sodium succinate. Ascorbic acid has also been reported to interfere with blood thinning treatments. Consult the doctor for advice before taking Ascorbic acid if taking any of the previously-mentioned medications.