Yes I have taken this many times but not for a while the only thing I can say is; it does relieve pain if used correctly and I will attached a little story to this,
6yrs ago when I was living in Mactan I developed sever pain in my knees and calf muscles and this would wake me in the middle of the night and I had to get up and walk around for 20mins to relieve this, I attended the fairly new and considered top hospital in Cebu for tests Chung Hau, this went on for a couple of days and I had every expensive test possible including an MRI also I had consulted with 3 specialists this cost me around P30K in total only to be told I was a Fat B@stard wearing the wrong shoes, which were Merrel Sandals. The Docs there were just a bunch of Quacks, this turned out to be a simple problem easily fixed, they had me on a few different pain killers but none were all that effective.
A friend of mine on hearing this story asked what I was using to which I said Tramadol, he then told me; DO NOT use them as prescribed and instead of taking one in the morning take two after breakfast, this gives you a bit of a hit and you may feel light headed for a short period, next day I had the two after one hour I was able to walk as normal (I had been limping before this) and almost forgot about the pain, also this was the first night I had a good night sleep for a month, next day I did two in the morning followed by one every 4hrs after, that second day I walked a couple of miles, next day I did not feel the need for the Tramadol and that cured me of my problem.
Two years after this the problem started again fortunately I was back in UK, there a proper Diagnoses was given, I had Bungalow Knees a condition brought on by not using stairs, simple cure, 3 times a day walk up and down a flight of stairs, in my case there was only two steps into my Bungalow, so 3 times a day I stepped up and down these 10 times, after around 5 days the problem was resolved.
So there you have it, not such a good idea to find a house to retire in that does not have stairs, this I did at aged 50yrs and aged 64 the problems started, I guess being a Fat B@stard does not help?