Norflex or orphenadrine is an extended-release muscle relaxant that works by blocking the nociceptor (pain receptors) that sends pulsatile signals to the brain to produce pain and can be used to treat musculoskeletal injuries, spams, or pain. Do not use in patients with dysphagia (difficulty swallowing), myasthenia gravis, narrow-angle glaucoma, or paralytic ileus. Don’t crush or chew the tablets. Avoid any patient with a history of drug abuse or addiction. Take special precautions if you are taking bronchodilators such as Atrovent or Spiriva, Cogentin, Bentyl, and Robinul. Some important side effects you may get medical help for are palpitations, uneven heartbeats, confusion, hallucinations, or if you are urinating less than usual.