<prompt> How much iron a patient can tolerate at a time given intravenously1000 mg2000 mg2500 mg3000 mg  <response>: The dose of parenteral iron is calculated using formula 4.4 x body weightkg x Hb deficit If the dose is more than 50ml each ml has 50mg of iron i.e. 2500mg iron then half the dose is given on day one and second half on next day. Thus maximum amount is 2500mg Reference: Dutta Obstetrics 7th edition Page no: 269 