Fax SC controls the insects by their contact, stomach, and systemic action. Primarily acts as an ingestion toxicant with some complimentary contact action and acts by interfering in nerve impulse transmission. It interferes with the passage of chloride ions through the Gamma Amino Butyric Acid (GABA) regulated chloride channel, thereby disrupting CNS activity and at sufficient doses, causing insect death. Fax SC (Fipronil 5% SC) is a modern insecticide of Phenylpyrazole group which controls the insect pests of rice, chilli, cabbage/cauliflower and sugarcane effectively. It has been proven to offer low dose, highly effective insect control against a broad range of economically important pests.