Answer
It is a sedating tricyclic antidepressant, not a product licensed solely for insomnia. Sedation may be relevant when sleep disturbance accompanies depression.
Sources for this answer
- Doxepin 50mg Capsules — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.