Common Dehydration.

Expert advice for Castophene Tablet
Together with Castophene, fiber rich diet containing whole grain bread and cereals, bran, fruits and green leafy vegetables, is essential to maintain healthy bowel function. Avoid taking a Castophene for more than 1 week, unless prescribed by the doctor, as it leads to dependency on the laxative action to produce a bowel movement.  Take Castophene after 2 hours from other medicines, as it may interfere with the absorption of other medicines. Castophene should be preferably taken at bedtime because it requires 6 to 8 hours to show impact.

Q. Does Castophene cause urine discoloration?
Castophene reacts with urine and causes discoloration of urine, but it is nothing to worry about it

Q. Does Castophene cause cancer?
Castophene when used for longer duration, beyond recommended dose may cause cancer growth.