Will decaf tea affect my inr whilst on warfarin. ive also been on 2.5mg bisoprolol since 1st june 23 for afib?

Decaf tea should not affect your warfarin but anything you eat/drink consistently can be fine because your warfarin dose can be adjusted for whatever you are eating/.drinking. The key to warfarin dosing is to eat/drink the same things consistently and do not make any sudden dietary changes. If there are any dietary changes made, have an INR checked. Good luck to you!