Calpol Six Plus Sugar Free Fastmelts (12). Only one pack of paracetamol products per order.. The paracetamol in CALPOL SIXPLUS FASTMELTS is used to relieve pain such as tooth pain, headache, sore throat and aches and pains that come with colds and flu. It also brings down fever (high temperature).. The active substance is paracetamol.. Each orodispersible tablet contains 250 mg paracetamol.