Canesten is the market leader for treatment of dermatological and gynaecological fungal infections. As well as offering products to relieve infections like thrush and athletes foot, they also provide a range of feminine care products. Canesten contains the original active ingredient clotrimazol developed by Bayer. Clotrimazol was introduced into the market in 1973 world-wide and its effectiveness could not be reached by any other active ingredient yet. Today, clotrimazol is the best known active ingredient in topical antifungal therapy. Thrush is an infection caused by a 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.