Thats a great question. In general all the NSAIDs have a lot of side effcts in long term, the main thing is not to use painkillers in the conditions where you can tolerate the pain. Ibuprofen is potent analgesic than the paracetamol. paracetamol is mainly antipyretic, so ibuprofen is preferred over paracetamol. but long term and frequent and unnecessary use is to be avoided.