Potassium citrate. Br br effective relief from the symptoms of cystitis. Br br low in sodium. Br br 48 hour course. Br br at the first burning, stinging signs of cystitis, you need relief fast. This is where cystopurin can help. Br br cystopurin is a low sodium 48 hour treatment for the symptoms of cystitis. Each pack contains 6 sachets which mix with water to make cranberry flavour drinks. Br br cystopurin works by counteracting the acidity of your urine, helping to relieve the burning, stinging pain on passing water. Br br beginning the cystopurin treatment at the first signs of attack will usually help you feel better within a few hours. Br br low sodium. Br br cystopurin is a registered trademark.