Treat thrush with Canesten 500mg pessary. Itching, swelling, redness, unusual discharge, burning, and soreness are common symptoms. Thrush doesn't change the pH level and has no odour. It's a common condition that affects 3 in 4 women at some point in their lifetime. Canesten is a well-known brand that offers effective treatment for thrush. While it may feel uncomfortable, thrush is not an STI or a serious condition and can be treated easily.