Cystopurin is a low-sodium 48 hour treatment for the symptoms of cystitis. Each pack of Cystopurin contains 6 sachets, which mix with water to make cranberry flavoured drinks. There is no doubting a real attack of cystitis. Each woman may vary in the ferocity of her symptoms, but some of the following will always occur: Initial urethral twinging leading to knife-like pain on passing urine Frequency of passing urine leading to urgency as well Neither of these are pleasant, especially if they occur frequently and they can be inconvenient, incapacitating and often frightening; more so when far from a toilet, home or doctor. Then other symptoms of cystitis may join the first two, these are: Blood in urine Smelly/foul smelling urine Cloudy or dark urine Abdominal pain or backache Fever, temperature and weakness