My 84yr old dad has been on the Fentanyl
patch for about 3 yrs. He started at 12.5 mcg, then 25mcg. He changed the patch every 72hrs. He felt good. No side effects. Last summer, after toe amputation surgery, he was put on 50mcgs for post-surgical pain. Since then he has been nauseous every day, losing weight due to no appetite, very sleepy and little energy. At first, we believed it was due to infections he was battling, strong antibiotics, anemia and low thyroid.