How can I get my cat to stop peeing outside the litter box?

Dear Most Esteemed and Knowledgeable Kitties: I have two male cats that grew up together since they were tiny. They are both neutered but one, Loki,  seems to be more stressed out than the other. We brought Loki to the vet because he was standing in the litter box while peeing and pees against a wall (almost every day). They did find very small crystals in his urinary tract but she thought the behavior was stress-related. So we tried the Feliway and “Good Cat” herbal stress reducer. It seemed to work at the beginning, but now it’s back to his same routine. He pees in one location every day and defecates in the litter box….

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