Alvect 400mg Tablet is used to treat roundworm infections. Commonly encountered roundworms are Ascaris lumbricoides (long roundworm), trichiurus trichiura (whipworm), necator americanus (new world hookworm) and ancylostoma duodenale (old world hookworm), strongyloides stercoralis (threadworm) and filariasis (elephentiasis). This medicine is generally considered to be safe and effective in treating infections due to these parasites.