I only take pain killers in general when I feel it can't just get on without it, I have significant damage to my right knee and permanently were a support when in the woods. However the more sinister side to pain relief is what GPs charge for the same product I can get at ASDA for 13p, not that I have pay for prescribed medication as they are free in Scotland. It is also noted that a lot of the time GPs will only give you what the reps will give them a free pen for, £7.50 is way higher than Nurofen. I know I'm being cynical...