The ParaSustain tablet contains 665 mg of paracetamol and is a controlled release tablet. Paracetamol, the active component, is a widely used analgesic and pain reliever. It is used to treat fever as well. Although the exact mechanism of action of paracetamol is yet unknown, it is thought to act centrally in the brain. The 665 mg of paracetamol in each tablet is specifically manufactured to provide a prolonged release profile of the medication. Up to eight hours of pain alleviation should be possible with each dosage.