schizophrenia and infertility

My brother aged 32yrs is suffereing from schizophrenia since 13 yrs. he used variety of medicines and presently since last 2yrs he is taking
I) Diva OD 500-- 1* 2(Divalproex Sodium)
II) Skizoril 50---1(Night)(Clozapine Tab)
III) Pacitane tab--- 1(Morniing)(Trihexyphenidyl Hydrochloride Tab I.P.2mg)
He got married 8 months back, but could not reproduce. His semen analysis has shown the following results:
sperm concentration (spermatozoa) 10 million per mL, motility 70%, and morphology 80% RBC- Nil WBC-Nil, Epithelial cells -few.
Please guide whether treatment is possible? what shall be the dosage of medicines being taken by him which may help in fertility ( The Doctor has stopped Pacitane tab---Trihexyphenidyl Hydrochloride, since 15 days can it incite his disease?)? Whom to consult?