Paracetamol and ibuprofen work in different ways, so they are sometimes combined or staggered to manage fever and body aches when one alone is not enough. Each must be taken strictly according to its own label instructions, and you should never exceed the stated dose of either.
Ibuprofen is not suitable for everyone. People with stomach ulcers, kidney problems, certain heart conditions, asthma triggered by anti-inflammatories, or who are pregnant should avoid it unless a doctor advises otherwise. Paracetamol is hidden in many combination cold and flu remedies, so check labels to avoid accidentally doubling up.
Because individual circumstances vary, ask a pharmacist or doctor before combining them, especially for children, older adults, or anyone with existing health conditions or other medicines.