back pain
"For back pain, this is the Cadillac.  Fast acting, low cost, no side effects for either me or my wife.  Most often used for lower back pain, usually of unknown cause.  We start to use it after 1 day of pain that doesn't go away.  Never need to use it for more than 2 days; often works within several hours.  Always taken with a meal.  ABSOLUTELY no side effects.  Works when even the most expensive prescribed medications don't."