Answer
It adds caffeine as an analgesic adjunct. Caffeine may support paracetamol’s pain-relieving effect but can also cause stimulant effects such as sleeplessness or palpitations.
Sources for this answer
- Panadol Extra Advance/ Panadol Period Pain 500mg/65mg Tablets (GSL) — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.