Hi, Welcome to HCM To prevent vaginitis due to candida infection which is most likely cause in your case, you have to prevent heat and wetness in your vagina. For this, you should avoid wearing synthetic undergarments and G strings. Avoid any chemicals in vagina, like bubble bath, foam bath, vaginal douching, antiseptic solution etc. You must avoid tampoons, or any foreign body in your vagina. You have to take best hygienic measure during menstruation and before and after intercourse. You should continue taking any antibiotics as prescribed by your doctor or OBS. Avoid even protected intercourse until you completely get rid of Candidiasis. Make sure that your partner also gets checked and treated. Usually Candidiasis is not a STD, As you are getting it recurrently, better to treat him also. Some Candida species are resistant to usual anti-fungal tablets, so you may need to get either long course of the same tablets, or your doctor will choose the best one from the available anti-fungal medications. Hope this helps you. Regards.