Q: How
quickly IV Vitamin K starts
working?
Answer: Somewhere around 2-6
hours.
IV
Vitamin K should be given very slowly over 20-30 minutes. It may cause
hypersensitivity. Symptoms may include facial flushing, diaphoresis, chest pain,
hypotension, dyspnea, cardiac arrest and death. Very low dose (1-2 mg) is mostly
enough.