prevention of bladder infection
"I've used Mandelamine/Methenamine for 7 years and it works for me. I never get less than a year between infections but I am now 2 years and 9 months without an infection, after previously trying almost every medicine available with mixed results.  Sometimes I'd get a break-through infection after 2 months and other medicines would last 5 weeks, being taken every day.  I've had no bad effects, taking 1MG at bedtime, but do drink the glass of water with it. I get overnight discomfort if I don't."