Ive been on warfarin for four months due to bi lateral pulmonary embolisms which arose from an adverse reaction to voriconaole(vfend).   I have been constipated since this occurred and have had blood with my stools when I do go.   I have been taking 4 coloxyl a day with lactalose most days just to keep things barely moving along.  It is a public holiday here.  Can it wait until next Friday to go to the Dr.
Constipation can cause bleeding in two common ways:1. Hemorrhoids2. Temporal ulcers (erosion of the lining of the rectum caused by hard stools passing)Normally these do not cause severe bleeding, however, because you are on a blood thinner (warfarin), you should have your doctor evaluate you and check your blood counts to determine what needs to be done next.