Canesten Dual Action 1% w/w Cream is used to treat athlete’s foot or jock itch. If you are unsure whether you have one of these fungal skin infections, seek the advice of your doctor or pharmacist. The active substance in Canesten Dual Action Cream is clotrimazole. Clotrimazole belongs to a group of medicines called imidazoles and is an antifungal agent which fights the cause of fungal skin infections.