Dog on Prozac not urinating : Pets

I started my dog on Prozac per vet recommendations. She’s 17 and suffers from dementia. It’s been about 5 days now on the medication. I’ve noticed a loss in appetite and she’s lethargic, these symptoms don’t worry me much as they were more or less expected and are said to minimize after a couple of weeks on the medication. However, what does worry me is that she has barely urinated since about the third day of being on the medication. I put her outside and she will simply stand there until I pick her up and bring her in. She is eating and drinking less but it still seems a bit alarming. Just wondering if anyone else has had experience with this and their pets??

Planning to watch her tomorrow and potentially lower her dosage. No other alarming side effects are apparent.

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