Valacyclovir
"Was feeling pain in my back under right shoulder blade for about a week. The pain meds I'm on for chronic back pain didn't even help. Stepping into the shower I noticed a rash and knew what I had... Shingles at 53—and no stress in my life. Never had chickenpox either. 

Called doctor next morning and given script. Took first two doses day after rash/blisters appeared. Been on for 48 hours (eight doses) and rash hasn't spread, but itching and mild pain persist. I could not imagine the pain I'd have had if I hadn't  been taking Norco, cymbalta, and robaxin already. Fingers crossed this continues to rapidly get better."