My cat had crystals in her urine in November and I was told she needed to go on the Rx diet by the vet I took her to who is not her usual vet. Long story short, my usual vet just gave her antibiotics which seemed to help her "infection" (going in and out of the litterbox frequently, peeing in the sink etc) but it recently came back while still finishing out her antibiotics. Took her to a new, better, vet who did another urinalysis this month in January and found no crystals and normal urine. He said to monitor her the rest of the week and if shes still having litterbox issues, then he will probably put her on Rx food.
Has anyone else had this problem with crystals appearing but then later disappearing while the cat is still having litter box problems?