My oldest son is on Risperdal,as well as three other meds. He has done quite well with
Allegra for seasonal
allergies, and even better with Zyrtec. Zyrtec is OTC but allegra is not. Both are well tolerated with Risperdal. Benaadryl is not good with Risperdal. My son, age 17, is zonked out when he takes both. He basically is out like a light and doesn't wake up in the morning (until about 12 hours later) the few times he has taken it. Not good at all.