I adopted a male cat last May, 2018. He was a prior abuse cat, thrown against a wall which injured his back legs. He walks fine today but has a little wiggle to his walk. Then he lived outside for some time, abandoned twice by two different owners. I scooped him up and brought him to a shelter which he lived in for 6 months until I could adopt him. I spent time working with him separately and now he has run of the house. He has been living part time in the same space with my female cat Mary. They are about the same age, 2. When I am in the room with them my male cat (the newly adopted one) stares at her. If I step out of the room for a split second, he jumps on her, then Mary begins to scream. I have introduced them slowly. The intros started in September. They can successfully eat next to each other and have separate sleeping spots. I started the Male cat on Prozac 2 weeks ago under my vets suggestion to try and curb his aggression toward the female. I have this fear that even after the 6 week time period is over (time it takes for meds to work), I will be in the same boat. Aggressive male towards female cat that just wants to be left alone. I am in the process of gating off my house to have them live separately. I can't stop him from jumping on her. And yes both are neutered/spayed. Any help would be appreciated.