From the manufacturer's website:
You’re doing all the right things to get rid of periodic water weight like avoiding salty foods and staying active. DIUREX Max can help by promptly getting rid of the water weight so you can feel better, faster.
DIUREX Max Caffeine-Free Water Pills contain the maximum-strength dose of a safe and effective* caffeine-free diuretic for prompt relief from the uncomfortable and heavy feelings of periodic water bloat.
Diurex Water Pills work by increasing urination to help rid your body of excess water. Frequent bathroom trips mean Diurex is doing its job, so make sure to stay hydrated and use Diurex water pills as directed on the packaging.
*These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure or prevent any disease.