Thanks for writing in.
I am a cardiologist and read question with diligence.
To begin with ORLISTAT
was a prescription drug as per FDA guidelines 1999. Only in 2007 it was decided to make low dose preparation available over the counter. Coming to the point relevant to you description of something which could be blood. There is definite mechanism with which Orlistat aggravates effect of blood thinner like Warfarin
. The blood thinning effect of warfarin (Coumadin
) depends on the amount of vitamin K in the body, and vitamin K is one of the vitamins
that binds to fat. Patients receiving warfarin who begin orlistat should have their blood clotting monitored closely because the orlistat may cause levels of vitamin K to decline. This will increase the effects of warfarin and lead to abnormal bleeding from the warfarin. Therefore, if you are taking any other drug which could have warfarin like action, the possibility of blood in stool
can not be excluded on basis of information provided by you. If you are not taking any other drug there is no report that by causing vitamin K deficiency induced by Orlistat causes bleeding. So, there is cause for concern not of panic.
My personal feeling is to urge you to see a doctor who can determine what exactly is the situation.
Dr Anil Grover, Cardiologist
M.B.;B.S, M.D. (Internal Medicine) D.M.(Cardiology)