Fluconazole 150mg Capsule is a single dose, fast-acting capsule, taken orally. It is a convenient and discreet way to help clear thrush. Thrush is an infection caused by yeast called Candida. This yeast normally lives in your body quite happily without doing you any harm. But when the natural pH balance of your vagina is upset - which can easily happen - Candida can multiply. And that's when you may start to itch and develop thrush. It is also suitable for male partners if they have a thrush infection (of the penis), to help prevent re-infection after sexual intercourse.