Iron salts may decrease the blood concentration of bisphophonates (for example, aldendronate, etidronate, risedronate, or tiludronate), cefdinir (Omnicef), deferiprone (Ferripox), dolutegravir (Tivicay), eltrombopag (Promacta), levothyroxine (Synthroid), quinolone antibiotics (for example, ciprofloxacin, levofloxacin), and tetracycline antibiotics.
NURSING MOTHERS: Iron is normally found in breast milk. Ferrous sulfate is secreted into breast milk.
SIDE EFFECTS: The most common side effects associated with ferrous sulfate treatment are constipation, dark stools, stomach pain, nausea, and vomiting. Less common side effects include diarrhea, heartburn, and urine discoloration.
REFERENCE: Ferrous sulphate - Medline
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