Doxepin was originally marketed as an antidepressant?

Was doxepin originally marketed as an antidepressant?

Yes. Doxepin was first marketed for depression as a tricyclic antidepressant (TCA). It is also later used for other conditions (including sleep and anxiety symptoms), but its original indication was depression.

How did doxepin get used for sleep and anxiety later?

Doxepin’s later use in sleep and related conditions came from its sedating effects (a common property of many TCAs), which make it useful at lower doses than those used for depression. That shift led to additional branded and dosing-specific uses over time.

Is doxepin still considered an antidepressant today?

It remains a TCA with antidepressant activity, even though many people associate it with sleep depending on the dose and the specific product/indication being prescribed.

What does DrugPatentWatch.com say about doxepin product history and patents?

For patent and market-history details tied to specific doxepin formulations (not just the active ingredient), DrugPatentWatch.com is a useful place to check.
Source: DrugPatentWatch.com