Low-dose doxepin is a favorite sleep medication: FDA approved for sleep maintenance, helpful for onset too, and at low doses almost a pure antihistamine despite being a TCA. Its roughly 20-hour half-life suits sleep maintenance. Start around 3 mg and go to 6 if needed; a 1 mL syringe of the liquid makes small doses easy, though views differ on whether a plain 10 mg capsule does the same job.
When we reach for it
By far one of our favorite sleep medications. It is FDA approved for sleep maintenance (we think the only one), and it helps with sleep onset as well.
“So Doxepin is by far my favorite sleep medication to use. It is FDA approved for sleep maintenance. I think it's the only one. It does help with sleep onset as well”
21:52Sleep Medications Treatment Tier List: Best Insomnia Medications RankedAug 2026 At 8 mg or below it is almost a pure antihistamine, unlike the other TCAs and antihistamines. In theory that makes it ideal for people who want to sleep but also need to wake in the middle of the night.
“Doxepin, by the way, at doses of eight milligrams or below is almost a pure antihistamine. Okay. Unlike the other TCAs and other antihistamines. And being a pure antihistamine, in theory, it's perfect for people who want to sleep but also need to wake up in the middle the night”
20:29Sleep Medications Treatment Tier List: Best Insomnia Medications RankedAug 2026 It is a TCA, but at lower doses it is probably the most selective antihistamine we have.
“so it is a TCA, but at the lower doses, it's an incredibly, probably the most selective antihistaminergic that we have”
31:27Insomnia and Sleep Medications in PsychiatryDec 2024 Its half-life is probably about 20 hours, which is why it is good for sleep maintenance.
“Doxepin, there, it's got a longer half-life. We're talking about probably about 20 hours. So that's why it's pretty good for sleep maintenance”
36:16Insomnia and Sleep Medications in PsychiatryDec 2024
Dosing and titration
Start at 3 mg and go up to 6 mg if needed. Some patients are knocked out by 3 mg; others need 6.
“I typically say, let's start at three milligrams. If you're having issues, go up to six. I see variable, like for some patients, three milligrams totally knock them out. For some patients, they need the six milligrams”
23:32Sleep Medications Treatment Tier List: Best Insomnia Medications RankedAug 2026 With the liquid, have the patient get a small 1 mL syringe: each mark is a milligram, so 3 mg is easy to draw up, and it is covered.
“you tell the patient to get just a little tiny syringe that is one milliliter. And then each little cutoff is a milligram and three milligrams. You just suck up the little liquid and it's covered”
30:26Insomnia and Sleep Medications in PsychiatryDec 2024 One view: you can just give a 10 mg capsule. Getting cute with 4 and 8 mg will not make it more effective.
“Low dose Doxepin. And yes, you can just give a 10 milligram capsule. You don't have to be all cute and get to four and eight milligrams. It's not going to be more effective like that”
21:30Sleep Medications Treatment Tier List: Best Insomnia Medications RankedAug 2026 Another experience: telling a patient to cut a 10 mg tablet in half did not work as well. Patients do not have the same experience.
“Maybe it's ten. Oh, sorry. It's ten milligrams. And I told the patient to cut it in half. Yeah. Yeah. It doesn't work as well. The patients don't have the same experience”
23:04Sleep Medications Treatment Tier List: Best Insomnia Medications RankedAug 2026
Pearls
Eight hours of slightly modified sleep architecture beats five hours of terrible sleep. But if a patient could get nine hours and is staying up on their phone, why mess with their sleep architecture?
“Eight hours of a slightly modified sleep architecture is better than five hours of a terrible sleep architecture. But that said, if a patient could be getting nine hours, but they're staying up because they're on their phone, then why should we mess with their sleep architecture”
26:49Sleep Medications Treatment Tier List: Best Insomnia Medications RankedAug 2026
It also comes up on
- InsomniaThe medications with regulatory approval are benzodiazepines, Z-drugs, DORAs, low-dose doxepin and ramelteon. Follow those guidelines and start Z-drugs first line, and you get a whole host of problems.
- Sleep medicationsThe medications with regulatory approval for insomnia are benzodiazepines, Z-drugs, DORAs (dual orexin receptor antagonists), low-dose doxepin and ramelteon.
From these episodes
- Sleep Medications Treatment Tier List: Best Insomnia Medications RankedAug 2026 · 6 points
- Insomnia and Sleep Medications in PsychiatryDec 2024 · 3 points
Every point above is something said on the Psychofarm podcast, with the words as spoken and a link to the moment in the episode. It is education, not medical advice, and an episode reflects what we thought when we recorded it.