These drugs can increase the risk of severe bleeding and heavy blood loss. Because of this risk, anyone taking an anticoagulant drug must take care to avoid injuries. Sports and other potentially hazardous activities should be avoided. Any falls, blows to the body or head, or other injuries should be reported to a physician, as internal bleeding may occur without any obvious symptoms. (more...)

Other sites

http://www.annals.org/cgi/content/full/147/11/I-38

http://www.bchealthguide.org/kbase/topic/detail/drug/ue4142/detail.htm

http://www.turner-white.com/memberfile.php?PubCode=jcom_feb04_major.pdf

http://www.aafp.org/afp/20040815/tips/8.html

http://en.wikipedia.org/wiki/Anticoagulation_in_pregnancy

http://www.tigc.org/eguidelines/duration04.htm

http://www.mayoclinic.com/health/warfarin/HQ01614