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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Oral anticoagulant causes all except: March 2012
assistant
The correct answer is  Ans: B i.e. Anticaogulant effect both in vivo and in vitro Anticoagulant Warfarin and its congeners act as antiocagulants only in vivo, not in vitro. This is so because they act indirectly by interfering with the synthesis of vitamin K dependent clotting factors in liver. Bleeding is the most impoant problem with anticoagulants; ecchymosis, epistaxis, hematuria, bleeding in gastrointestinal tract. Intracranial or other internal haemorrhages may be fatal.