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Thank you for your question. My name is***** I have been a small animal veterinarian for 13 years. I'm sorry to hear about your boy. Male cats with urinary problems can be challenging.
I'm not clear from your description... is he still on the valium and proaosin now? When was the last time that he received a dose of these medications?
Okay. He can have another dose of prazosin.... as much as .5mg every 12 hours is fine.
How much the prazosin will help depends on why he is straining. Some cats continue to have inflammation in their bladder after surgery. They don't usually get blocked because the PU has widened their urethra, but they can still have bladder discomfort. Often these cats need one of the urinary diets. If the straining is coming from scar tissue the prazosin may not help either. What it really helps with is spasms in the urethra itself.
Go ahead and give another dose and watch closely to make sure he continues to be able to pass urine.