Panadol Acti Fast Tablets Panadol Acti Fast Tablets are specially formulated to work quicker than standard paracetamol, absorbing into the bloodstream twice as quickly for fast, effective pain relief. They can be used for relief from headache, toothache, back-ache, rheumatic & muscle pains & period pain & also relieve sore throat pain & the feverishness, aches & pains of colds & flu. The active ingredient in Panadol Acti Fast Tablets is paracetamol which is a pain reliever that also helps to reduce your temperature when you have a fever.