Yes, I take 5 mg of Warfarin but now I have an "influenza" with fever so my INR is very low and I have had to take several days with Fragminshots to compensate as the INR was under an INR of 3.0 for several days.
What works for me besides selftesting, is that I write everything on a paper; a new drug (how many and how long time) exercize (how many minutes) etc. When the INR is high I take more K-vit rich vegetables (writes the amount). CONSTANCY in everything is the key. It takes 2 - 3 days to get the INR up but with vegetables if goes faster to get it down. I can get my INR down in 15 - 20 hours with some big brouzelstprouts.If i change my Warfarin doze (2 tablets of 2,5 mg) I do it with 1/4 of a tablet and WAIT a couple of days to see how it works. Then if it is not enough I take 1/4 more and wait 3 days more.
We are all DIFFERENT but I think my INR is difficult to control that is why I selftest.