On the  long scale , one billion is 1 million million, or 1 and 12 zeroes (1,000,000,000,000). The long scale is still used in some European countries (France, for example). The UK switched to the short scale in 1970/71. On the  short scale , one billion is 1,000 million, or 1 and 9 zeroes (1,000,000,000).
The amount of vitamin K in your diet can affect the amount (dose) of. warfarin you need to take. Your medicine dose must be balanced with your. diet to allow the drug to work correctly. A few things to remember when taking warfarin: You want a medium or moderate amount of vitamin K in the foods you. eat.
1 So many drug interactions are possible with warfarin that prescribing any medication to the patient taking warfarin should give the physician pause to consider the potential for drug toxicity or to consult a prescribing formulary.onsider reducing the warfarin dose by 25% when giving it in combination with amiodarone. Some medications can induce warfarin metabolism, thereby reducing the risk of bleeding. Failed anticoagulation has been observed when rifampin, carbamazepine, phenobarbital, or phenytoin is given in combination with warfarin.