Table 1 Inclusion/exclusion criteria for the GAD treatment trial

18-30 years old

Currently undertaking CBT with psychologist health care professional

Primary diagnosis of GAD (based on ADIS-IV criteria)

Currently seeing a psychologist or psychiatrist

Consent to participate in the trial

Taking psychotropic drugs

Access to the Internet

At risk of self-harm or suicide

Active email address and phone number

Current or past diagnosis of psychosis, schizophrenia or bipolar disorder

Sufficient English language literacy

Current primary diagnosis of major depressive disorder, panic disorder, social phobia, obsessive compulsive disorder, post-traumatic stress disorder or substance dependence (i.e. a comorbid disorder deemed to require treatment before GAD). This will be ascertained by administering the ADIS-IV and establishing primary and secondary diagnoses.

Treatment with Monoamine Oxidase Inhibitors (+/- 14 days before or after treatment) or concomitant pimozide

Treatment with sertraline in the past three months for a period of two or more weeks

Planning to become pregnant, pregnant or breastfeeding