Brief Answer: may affect serotonin levels Detailed Answer: Hi, thanks for using healthcare magic There are no known interactions between risperdal and colon cleansers but there is a slight risk of interaction with the garcinia cambogia. Garcina is thought to affect serotonin levels in some persons. It is thought to increase these levels. Risperal affects different chemicals including serotonin. It has anti serotonin effects. It is possible that increase serotonin levels may affect this aspect of the medication. You may want to consult with your psychiatrist before using this supplements to see if he or she believes it will have any adverse effects. Garcinia cambogia also decreases glucose levels, can increase the risk of side effects with some cholesterol medication (muscle aches and pains) I hope this helps, feel free to ask any other questions

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