Erythromycin 1g, Nystatin 3, 56g and Prednisolone 0, 5g compatible in Beeler base ad 50g?

-I wondered if erythromycin and Prednisolone are compatible in an image base? -Is it not better to make 2 separate creams for the sake of stability? Bv Erythromycin in Beeler base and Prednisolone in a buffered cetomacrogolcreme? -Which cream do you add best nystatin to?