Hi My Brother Is Suffering With Schizophrenia And He Is

Hi my brother is suffering with schizophrenia and he is taking onyx 5 mg and lithium twice a day is it possible that he can stop taking these medicines some time in his life.and he is not Married we want to marry him wanna find out that the medication make him hard to have baby .and he is 28 years old and on and off from 7 years on these medicine