Panadol Extra Advance 500 mg/65 mg Tablets comes in a 16-tablet box, and each film-coated tablet contains paracetamol 500 mg plus caffeine 65 mg (eMC SmPC). The Panadol UK product page describes the Optizorb formulation as starting to absorb in as little as 5 minutes.
It is used for short-term relief of common pain and fever symptoms such as headache (including migraine), backache, toothache, period pain, muscle aches, and colds/flu aches and fever (per eMC). Always read the label/leaflet and use only as directed, especially because it contains paracetamol and caffeine.