The correct dose of warfarin is different for every person and depends on the result of your INR blood test, so it is important to follow your doctor's instructions closely.
Warfarin is usually taken once a day, with or without food. Some doctors prefer that their patients take their dose in the evening. This allows the dose to be changed if necessary on the day that the INR results are obtained, rather than waiting until the next day.
Whatever time you choose to take your warfarin, it is easiest to remember if you take it at the same time every day.
Another option to help you remember is to use a record sheet. This is a form where you write in the dose you need to take on the appropriate day and then circle the dose when you have taken it (see below). This will help to both remind you of the correct dose and indicate that you have taken that day's dose. There are also spaces to record your INR results and your next doctor's appointment.
It is important to take warfarin exactly as your doctor tells you. Never skip a dose and never take a double dose. If you miss a dose, take it as soon as you remember. If you don't remember until the next day, please call your doctor for advice. If you can't get hold of your doctor skip the dose and start again with your dose for that day. Mark the dose you missed in a diary or on your record sheet and tell your doctor at your next visit.
If you, or someone you know, accidentally takes too much warfarin call your doctor as soon as possible. If you can't contact your doctor call the Poisons Information Centre on 13 11 26 or go to the emergency department at your nearest hospital.