My 5yo daughter has calpol whenever she cries and tells me she is in pain - not from a fall, but from things like leg pain which she gets from time to time. I also gave some to her last week when she had some mosquito bites which were massive (golf ball diameter) and she woke up in the night in pain/itchiness with them.
Basically, I have no problem with giving her Calpol as and when she says she needs it, but my husband thinks I should hold back and only give it to her if she's in a fair bit of pain or else she won't develop a tolerance for pain and will become dependent on drugs and will be on crack at 16.