Pharmacists provide screening for a variety of mental illnesses in different settings. Various referral methods and follow-up pathways may be utilised for post-screening patient care. However, current evidence is insufficient to establish improvements in early detection, treatment, or outcomes. Further large, well-designed studies are required to support the role of pharmacists in mental illness screening, provide evidence on the impact of pharmacist-led mental illness screening services and inform the most effective follow up and referral methods.