Mr Parker is a 29 year old brick-layer who you met last week and after assessment diagnosed oral Candida. When you first saw him, he had had a five day history of oral pain and an enlarging white patch. On examination you identified a white plaque which was easily disrupted with a tongue depressor and which was overlying an erythematous base. You prescribed Miconazole gel but Mr Parker was unable to tolerate it so you switched this to a Nystatin suspension.
Mr Parker reports minimal symptom improvement 7 days later, what is next most suitable treatment options?