Yes, you can absolutely take paracetamol and ibuprofen on a plane in both your carry-on and checked luggage. These are considered over-the-counter (OTC) medications and are not subject to the same strict security rules as liquids. If they are in pill or tablet form, there is generally no limit on the quantity you can carry for personal use, though it is always a "best practice" to keep them in their original blister packs or bottles to avoid confusion during security screenings. If you are carrying liquid versions (like Calpol for children or liquid-capsules), they must comply with the 100ml liquid rule unless they are medically necessary for the flight, in which case you should declare them to security. While these are legal in almost every country, always check the specific laws of your destination—for example, some Middle Eastern or Asian countries have very strict rules about certain painkiller ingredients that are common in the West.