postherpetic neuralgia
"I had shingles for two and a half weeks, then experienced severe nerve pain after the sores began to heal. My doctor originally prescribed Vicodin, then switched me to Lyrica in anticipation of my return to work. Lyrica was very effective at reducing the severity of the pain, but it caused me to be very drowsy. I slept for 14 hours a night, and had difficulty concentrating during the day. I would also have trouble remembering things I had done while taking Lyrica. I had to discontinue using it."