My vet has put my male cat on a mild "relaxer" to prevent cystitis.? - cystitis male

my vet put my cat in a relaxed ". It is an ointment rubbed on the ear all day. Your veterinarian is to show that recent studies show that in theory, could cause the behavior, because, as the brain works, a cat and can infections cause blood in urine and bladder infection again be required. Since the drug in syringe disposal, and my husband picked it up and do not know her name but seems to work. They plan to keep it for 6 months as evidence. This is our second month. Our cat was 3 years old in March 2009. He had infections, a constant, since we have had repeated. It is the only cat and sharing the house with 2 cats . No child in the home or other pets. He is very spoiled and I can not imagine what is likely to be stressful, but it seems to work for us. Do you already have this new theory?