Gradually recovering from flu. I am left with a rasping, painful cough and very little energy/strength. Mrs Dave (who is cleverer than me) suggested "one of those tablets you use when cycling".** So I duly tried one and it really worked. Not a miracle cure but it gave me what I needed to have a shower. Tried it 3 days on the run and it really helps. **I use them in hot weather cycling.....30+ miles.