At the first burning, stinging signs of cystitis, you need relief fast. This is where Cystopurin can help, beginning the Cystopurin treatment at the first signs of attack will usually help you feel better within a few hours. Cystopurin is a low-sodium 48 hour treatment for the symptoms of cystitis and works by counteracting the acidity of your urine, helping to relieve the burning, stinging pain on passing water. Each pack contains 6 sachets which mix with water to make cranberry flavour drink