Plaintiffs attorneys have filed a class complaint on behalf of millions of consumers of Zoloft, alleging they were misled about the effectiveness of the prescription antidepressant drug.

The suit is the first consumer class action filed over Zoloft, one of several selective serotonin reuptake inhibitors, or SSRIs, used to treat depression and anxiety disorders, said Michael Baum, senior managing partner at Los Angeles-based Baum, Hedlund, Aristei & Goldman. Baum’s firm has filed similar consumer class actions over the drugs Paxil, Celexa and Lexapro.