(the brand name for risperidone) is not a veterinary drug, however studies have been done on Beagles for the drug. Overdose symptoms include lethargy, weakness, muscle tremors, ataxia and seizures
. It is too late at this point to induce vomiting, so if you absolutely will not take him to a vet, you need to watch him closely for any of the symptoms I listed above. If you see them, you need to not eat for a week if necessary, but you MUST take him to a vet or you will lose him.