What are the Side Effects of Risperdal?

The most common side effects of risperdal are aggressive behavior, dizziness, headache, increased dreams, increased sleep, insomnia, sedation, visual disturbances, nasal and throat inflammation, cough, constipation, diarrhea, dry mouth, nausea, decreased sex drive, missed periods, itching/skin rash, or weight gain. Other side effects may occur, but the most serious is neuroleptic malignant syndrome.