Thanks for using Health Care Magic Forum, Constipation
is major problem and you may be on iron tablets for treating anemia
so chance of brown colour is normal .
1)Drink plenty of fliuids
2)add fiber rich fruits in diet
10ml taken in night can prevent constipation.
Another thing is do endoscopy
study of gi tract so as to find any abnormal bleeding from upper gi tract.
I Hope I Provided Useful Information. Do ask Furthur Questions to help You get well soon.
Dr.J.Kingson John David