Can you drive a commercial truck or bus while on warfarin?

The disqualifying medications are:

any prescription medicine or controlled substance without a prescription

a habit forming drug, unless the prescribing doctor writes a letter stating you are safe to be a commercial driver while taking the medicine. If you have that letter, the medical examiner can, but does not have to, certify you to drive

antiseizure medicines used to prevent seizures

methadone

As long as you have a prescription for warfarin, you can drive while taking it.