Trichlorfon is used as a systemic insecticide and anthelmintic in domestic animals.It is also used in all type of domestic animals for treatment and preventition of different external and Internal. parasites an also used for majots prohibition. INDICATIONS For Ecto-Parasites. To eradicate and control the migrating and skin larvae of warble fly, skin larvae of dermatobia hominis, mango, Gasterophilus larvae, flies, sheep keds, against biting & suking lice, red avian mites & scaly leg mites in poultry, For Endo-Parasites; Negafas is indicated for the eradication & control of Round worms; Screw worms, bots and Schistosoma nasale.