Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns.. As per your complain it seems that severe itching on vulva after taking antibiotics can be most probably due to vaginal yeast infection known as Vaginal Thrush.. Normally small amounts of yeast is present in the vagina but when the count increases over the normal counts then there is infection leading to the symptoms like those being experienced by you.. Taking antibiotics is a common cause for Thrush.. In case if after taking antifungal medication like Canestan still the itching is persistent you should consult a Gynaecologist and get evaluated and a thorough clinical evaluation and investigations like Vaginal swab culture and Whiff test [to exclude bacterial infection causing bacterial vaginosis] can be advised for confirmation.. In case if Thrush is ruled out you can be advised to take a weekly dose of oral antifungalmedication like Fluconazole for 3 weeks.. Topical application of Clotrimazole vaginal cream and antifungal pesseries can also be advised.. Keep the area clean and dry.. Wear cotton and loose fitting undergarments.. Eat more of probiotics like Yoghurt.. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora.