How do you approach treating patients with delusions of parasitosis who can not tolerate an antipsychotic?

I continue to switch them until I find one they can tolerate. My typical approach is Abilify 2 mg daily and increase by 2 mg every other week until on 10 mg daily if tolerable. If they can’t tolerate that, then I switch to Risperdal and if they can’t tolerate that then I switch to pimozide. If they ...