SGAs also do the following: Tend to alleviate positive symptoms May lessen negative symptoms to a greater extent than do conventional antipsychotics (although such differences have been questioned) May cause less cognitive blunting Are less likely to have extrapyramidal adverse effects (including a much lower risk of tardive dyskinesia) Increase prolactin slightly or not at all (except risperidone, which increases prolactin as much as do conventional antipsychotics) Can generate a metabolic syndrome, with insulin resistance, weight gain, and hypertension.