Dear All Does anyone who uses the Toxilab system for toxicology have any information on risperidone? We have a sample from a patient who is suspected on taking a risperidone overdose but are unsure if the purple spots at stage 1 are due to risperidone or another drug? Any information would be welcome. Please e-mail me at [log in to unmask] Many thanks Jacqui Osypiw Royal Berks Hospital, Reading.