Folate deficiency w/ phenytoin, INH, primidone, barbiturates, OCs, ethanol, sulfasalazine, cycloserine, glutethimide, MTX, pyrimethamine, trimethoprim & triamterene. Zn interferes w/ captopril, tetracyclines, thiazide & K-sparing diuretics; decreases absorption & effectiveness of fluoroquinolones. Fe supplement may interact w/ acid pump inhibitors (lansoprazole, omeprazole, pantoprazole, rabeprazole), Al- or Mg-containing antacids, bisphosphonates (alendronate, etidronate, risedronate), H
2 blockers (cimetidine, famotidine, nizatidine, ranitidine), penicillamine, quinolones (ciprofloxacin, gatifloxacin, levofloxacin, lomefloxacin, moxifloxacin, norfloxacin, ofloxacin, sparfloxacin, trovafloxacin).