Harlow is a 4 month old girl who presents once more to the GP surgery following a 2 week course of Nystatin for oral candida. Her mother said she was told to continue the Nystatin for one week after her tongue looked somewhat improved, however it still looks white. Prior to this they had tried one week of Miconazole gel. Despite the appearance, Harlow is still having all her usual bottle feeds. Past medical history is unremarkable, and she was born at term with normal vaginal delivery.
On examination there is white plaque seen on the tongue which is removable with a cotton bud.
What is the next most appropriate course of action?