Panadol Acti Fast Soluble Tablets Panadol Acti Fast Soluble Tablets are specially formulated to provide fast, effective pain relief from headache, toothache, back-ache, rheumatic & muscle pains & period pain. They also relieve sore throat pain & the feverishness, aches & pains of colds & flu. The active ingredient in Panadol Acti Fast Soluble Tablets is paracetamol which is a pain reliever that also helps to reduce your temperature when you have a fever.