Hi, Tonsillitis with white patch over it may be due to accumulated pus or may be due to some other reasons like strep. throat, oral thrush, infectious mononucleosis, Diphtheria infection, Vincent s angina, viral pharyngitis. So, first of all you need to be diagnosed the exact cause of the tonsillitis by a physician through a series of investigations like throat swab culture and sensitivity test, total blood count, Antigen detection against specific organism. Your treating doctor can suggest you specific antibiotic against specific organism according to test result as penicillin injection and Amoxicillin or erythromycin. Do warm water gargle with adding one Disprin tab. for twice a day. Get well soon, bye.