Tramadol
"I take it for severe lower back pain. I have to take the maximum dose of 400 mg a day and you must take it on a regular basis every four hours and you may not feel the full effect unless you've been taking it consistently.    I am 50 years old very active and travel often the only side effect that I have is constipation if I don't take it on time my body tells me because then the pain reoccurs within 10 minutes of taking tramadol I feel fine"