I lost a litre of blood during childbirth so they prescribed iron tablets for me. Does anyone know how long I'm supposed to carry on taking them for? I haven't yet finished the box that was given to me in hospital. I was also given painkillers on the same prescription and I asked my GP for more of these and he has given me more of the iron tablets at the same time. The problem is they are making me seriously constipated, its awful! I've cut them down from two a day to one a day and have been trying to eat iron rich foods to compensate but wondered if anyone knows do I just finish the original box or do I need to carry on taking them?