Tapentadol
"I have been on the same dose of tapentadol and tramadol for 2 years for atypical trigeminal neuralgia with no development of tolerance. Limited gastrointestinal side effects and no CNS side effects. The medication has not lost any efficacy and has been more effective for my pain than Duragesic (fentanyl) 25mcg patches. With the Nucynta savings program I pay only $25 a month for 120 tablets."