Almost 4 months post transplant and have been experiencing a dull headache for the last few weeks, everyday. It is a dull headache and the discomfort is random...sometimes its on the left side of the head, sometimes on the right, sometimes between the eyes, etc. It's not a migraine, but a dull pain, nagging pain. Can this be a side effect from any of the medications? Pentamidine (aerosol) 1x monthly, Prograf 2mg 2x daily, metroprolol tartarate 12.