So over the past 4 years I've been getting a lot of utis to the point now where i get one every like 2 weeks. So my general doctor has prescribed tobramycin for bladder irrigation once daily. But i don't really know how to do it? I in and out cath with a normal catheter every 3-4 hours. Has anyone else tried tobramycin for daily bladder irrigation? Do i just cath get all the urine i can out and then put a new catheter in and inject the stuff? And How long am i supposed to leave it in there?