Hello, I am twenty three years of age, and I have a white coating on my tongue that is difficult to brush off, especially towards the back of my tongue where it is most present. This past Wednesday I finished up a round of Metronidazole antibiotics. According to what I've read, this is most likely a case of Thrush, due to the antibiotics. However, I only have one of the many symptoms of Thrush, i.e. the white tongue. Are there other possible diagnoses for having this white film?