Hedex Extra Tablets Hedex Extra Tablets provide extra relief from headaches including migraines. They can also relieve back-ache, rheumatic & muscle pain, toothache, sore throat, period pain, & relieve the fever, aches & pains of colds & flu. Hedex Extra Tablets contain two active ingredients: Paracetamol: a painkiller that also reduces your temperature when you have a fever. Caffeine: furthers help the effectiveness of paracetamol.