The Siddha combination drug that has been tried on persons with HIV and AIDS at the Government Hospital of Thoracic Medicine, Tambaram, Tamil Nadu shows promising trends. Tambaram TB Sanatorium superintendent Dr C.N. Deivangayagam said a combination of Siddha and Allopathy medicines taken by a patient along with a prescribed diet could control the infection and improve the quality of his life. However, this does not mean a cure for AIDS, he added.