Amoxapine (Asendin): How This TCA Works, Dosing, and When Telehealth Is Enough

Last updated: August 22, 2026

Amoxapine is a tricyclic antidepressant (TCA). The historic brand is Asendin. Clinicians use it for depression, often later in the sequence after an SSRI or SNRI has already been tried. It is a dibenzoxazepine TCA. It blocks norepinephrine reuptake and also blocks dopamine D2 and D4 receptors, which is why the label carries tardive dyskinesia and neuroleptic malignant syndrome warnings that most other TCAs do not. It is not a controlled substance. A licensed telehealth clinician can often continue a stable course after a full history, but new starts need a cardiac and movement-risk review, and overdose is a medical emergency.

This guide is educational. It is not a diagnosis and it is not a promise that any clinician will prescribe amoxapine.

Looking for depression care online? Klarity Health has 2,000+ licensed providers. Many visits happen by video. Coverage varies by plan. Self-pay is also an option. See online depression treatment options or browse conditions.

TLDR

• Amoxapine is a second-generation tricyclic dibenzoxazepine antidepressant. MedlinePlus a682202 (last revised March 15, 2026) lists it for depression. Historic brand: Asendin (discontinued; generics remain).
• The generic tablet label on DailyMed (setid a16297df) lists amoxapine tablets 25, 50, 100, and 150 mg. Indication: relief of symptoms of depression in patients with neurotic or reactive depressive disorders as well as endogenous and psychotic depressions. See DailyMed amoxapine.
• StatPearls amoxapine (NBK540980) (updated November 18, 2023) describes it as a later-line option after SSRIs and SNRIs. Usual effective dose 200 to 300 mg daily. Outpatient max 400 mg. Hospitalized patients without a seizure history may go as high as 600 mg in divided doses.
• MedlinePlus: usually taken one or more times a day. If once daily, take it at bedtime. Full effect may take several weeks. Do not stop suddenly; your clinician will taper.
• Boxed warning: antidepressants raised suicidal thinking and behavior versus placebo in children, adolescents, and young adults in short-term studies. MedlinePlus says children younger than 18 should not normally take amoxapine. Older adults should not usually take it because safer options often exist.
• Unique among many TCAs: the label warns about tardive dyskinesia and neuroleptic malignant syndrome because amoxapine has neuroleptic (dopamine-blocking) activity. Muscle stiffness, high fever, confusion, or involuntary movements need emergency care.
• Do not combine with an MAOI. Wait at least 14 days when you switch. Use caution after a recent heart attack, with glaucoma, urinary retention, seizures, or thyroid disease.
• Not a controlled substance. Telehealth can follow many stable adults. Chest pain, fainting, seizures, high fever, or any suspected overdose need emergency care. If you are in crisis, call or text 988.

Table of contents

• What amoxapine is
• How it works
• Approved and related uses
• Amoxapine dosage
• Side effects
• Warnings and who should not take it
• Interactions
• When telehealth is enough
• How a Klarity visit fits
• FAQ

What amoxapine is

Amoxapine is an oral tablet. DailyMed lists 25 mg, 50 mg, 100 mg, and 150 mg strengths. Product names are not interchangeable without a clinician and pharmacist check. DEA schedule: none.

Historic brand: Asendin. MedlinePlus marks Asendin as discontinued. Many pharmacies now dispense a generic. Related Klarity TCA guides: amitriptyline (Elavil), nortriptyline (Pamelor), desipramine (Norpramin), imipramine (Tofranil), protriptyline (Vivactil), and clomipramine (Anafranil).

How it works

MedlinePlus says amoxapine raises certain natural substances in the brain that help maintain mental balance. StatPearls describes it as a second-generation tricyclic dibenzoxazepine that mainly blocks norepinephrine reuptake. It has little effect on histamine H1 and most serotonin receptors, except the serotonin-6 (5-HT6) receptor. It also blocks dopamine D2 and D4 receptors. That dopamine block is why the FDA label discusses tardive dyskinesia and neuroleptic malignant syndrome even though amoxapine is not classified as an antipsychotic.

StatPearls: oral absorption is fast. Time to peak plasma concentration is about 90 minutes. Plasma protein binding is about 90%. The liver metabolizes it mainly through CYP2D6 into 7-hydroxy-amoxapine and 8-hydroxy-amoxapine. Parent half-life is about 8 hours. The 8-hydroxy metabolite half-life is about 30 hours. Most of the dose leaves in urine; a smaller share leaves in feces.

Because the active metabolite lasts longer than the parent tablet, many people take a once-daily bedtime dose once the total daily amount is 300 mg or less.

Approved and related uses

MedlinePlus lists amoxapine for depression. DailyMed describes relief of symptoms of depression in neurotic or reactive depressive disorders as well as endogenous and psychotic depressions. Treat that as the labeled use unless your own clinician and pharmacist say otherwise.

StatPearls frames amoxapine as a second- or third-line option after SSRIs and SNRIs fail. It also notes use when depression comes with anxiety, agitation, psychosis, neurosis, or recurrent episodes. Off-label research discussed in StatPearls includes neuropathic pain and some chemotherapy-related diarrhea work in animals or small studies. Those uses are not a reason to request the drug online. A clinician decides whether any of that evidence applies to you.

Guidelines generally treat TCAs as later-line after SSRIs and SNRIs because of anticholinergic effects, cardiac risk, and a lower overdose threshold. Related first-line options on Klarity include sertraline, fluoxetine, citalopram, duloxetine, and venlafaxine.

Amoxapine dosage

Only your prescriber sets your dose. The figures below come from the DailyMed label and StatPearls. They are not a self-titration plan.

DailyMed usual adult outpatient plan:

• Start 50 mg two or three times daily.
• If tolerated, raise to 100 mg two or three times daily by the end of the first week. Some people start at 300 mg daily, but sedation can be heavy in the first few days.
• Usual effective range: 200 to 300 mg daily. Give three weeks as a fair trial if you have reached 300 mg (or your highest tolerated dose) for at least two weeks.
• If 300 mg fails, the outpatient ceiling is 400 mg daily, depending on tolerance.
• A single daily dose may not exceed 300 mg and is usually taken at bedtime. Totals above 300 mg go in divided doses.
• Hospitalized patients who have not responded and have no seizure history may go as high as 600 mg daily in divided doses.

Older adults (DailyMed): start 25 mg two or three times daily. If tolerated, 50 mg two or three times daily by the end of week one. Many older adults do well at 100 to 150 mg daily. Careful increases up to 300 mg daily are possible. MedlinePlus still says older adults should not usually take amoxapine because safer options often exist. StatPearls notes the AGS Beers Criteria flag amoxapine for strong anticholinergic effects.

Maintenance: use the lowest dose that holds remission. For 300 mg or less, a single bedtime dose is typical.

StatPearls: some people notice benefit within about 7 days, and more than 80% of responders improve within 2 weeks in the cited older trials. MedlinePlus still says full effect can take several weeks. Do not judge a new start after two or three doses.

Missed dose (MedlinePlus): take it when you remember unless it is almost time for the next dose. Do not double.

Side effects

Common effects listed by MedlinePlus include nausea, drowsiness, weakness, nightmares, dry mouth, sun sensitivity, appetite or weight change, constipation, trouble urinating or frequent urination, blurred vision, and extra sweating.

StatPearls also lists insomnia, palpitations, tachycardia, hypotension, and constipation. The drug can flip some people with bipolar disorder into hypomania. Seizure risk is higher than with many SSRIs, especially in older adults and people with epilepsy.

Serious effects that need same-day or emergency care (MedlinePlus plus DailyMed):

• New or worsening depression, suicidal thinking, agitation, panic, severe restlessness, or frenzied excitement
• Muscle stiffness, shuffling walk, slow or difficult speech, or uncontrollable shaking or movements (possible extrapyramidal symptoms or tardive dyskinesia)
• High fever with rigidity and confusion (possible neuroleptic malignant syndrome)
• Fast or irregular heartbeat, fainting, or chest pain
• Seizures, rash, or severe confusion

Overdose (MedlinePlus): seizures and coma are listed. Call 911 if someone collapses, cannot be awakened, or has trouble breathing. Poison Control: 1-800-222-1222 or poisonhelp.org.

Warnings and who should not take it

Boxed suicidality warning applies to the antidepressant class. Watch mood closely at the start and after every dose change. Keep follow-up visits. If you are in crisis, call or text 988.

DailyMed: amoxapine is not an antipsychotic, but it has substantive neuroleptic activity. Tardive dyskinesia can be irreversible. Risk rises with longer use and higher cumulative dose, though it can appear after shorter courses. If involuntary movements start, the clinician may stop the drug. Neuroleptic malignant syndrome has been reported: high fever, rigidity, altered mental status, and unstable pulse or blood pressure. That is an emergency. Stop the drug and go to the hospital.

Do not use with an MAOI or within 14 days of one (MedlinePlus lists isocarboxazid, phenelzine, selegiline, and tranylcypromine). Tell the clinician about a recent heart attack, glaucoma, enlarged prostate, trouble urinating, seizures, overactive thyroid, or liver, kidney, or heart disease. Tell them if you are getting electroconvulsive therapy.

Pregnancy: StatPearls notes the old FDA category C language and animal fetotoxicity at high multiples of the human dose. Human data are limited. Breastfeeding data are limited; StatPearls points to agents with more lactation data, such as sertraline, when a newborn or preterm infant is nursing. This is a clinician decision, not a self-switch.

Pediatrics: not FDA-approved. Older adults: Beers Criteria caution plus MedlinePlus advice to prefer other drugs.

Interactions

Always give your clinician and pharmacist a full list. High-priority items from MedlinePlus, DailyMed, and StatPearls:

• MAOIs: contraindicated; 14-day washout
• Alcohol, barbiturates, and other CNS depressants: extra sedation
• Anticholinergic drugs: paralytic ileus risk when stacked with a TCA
• Cimetidine: can raise levels of several TCAs; the label says this has not been proven with amoxapine but still treat it as possible
• OTC allergy, cold, and sleep products (diphenhydramine and similar)
• CYP2D6 poor metabolizers: higher plasma levels of many TCAs, including amoxapine

Do not drive until you know how the tablet affects you. Alcohol adds to drowsiness.

When telehealth is enough

Amoxapine is not a controlled substance, so federal telehealth controlled-substance rules do not apply to the tablet itself. Video care can still be a good fit when:

• You already take a stable dose and need refills or side-effect check-ins
• You need a later-line depression review after SSRI or SNRI trials, and you can share records, an ECG if one exists, and a full medication list
• You can get labs or an in-person exam if the clinician asks

Video is not enough when you have chest pain, fainting, a seizure, high fever with rigidity, new involuntary movements, or a suspected overdose. Those need emergency care. New starts in people with heart disease, a seizure history, or bipolar spectrum symptoms often need more than a single video visit.

Insurance may cover a telehealth psychiatry visit. Coverage varies by plan. Verify benefits before you book. Self-pay is also an option.

How a Klarity visit fits

Klarity Health connects you with 2,000+ licensed providers. Many depression visits happen by video. A clinician reviews your history and decides whether amoxapine, another antidepressant, therapy, or a mix is appropriate. No one on this page can promise a specific prescription.

See online depression treatment options or browse conditions.

Disclaimer: This article is for education only. It is not medical advice. Coverage and prescribing decisions vary by clinician, state, and plan. Verify your benefits and talk with a licensed clinician before you start, stop, or change any medicine. If you are in crisis, call or text 988.

FAQ

Is amoxapine the same as Asendin?

Asendin was the brand name. MedlinePlus marks it discontinued. The generic is amoxapine.

Is amoxapine a controlled substance?

No. It has no DEA schedule. That does not make it low risk. Overdose and movement-related reactions still need emergency care.

Why does amoxapine have tardive dyskinesia warnings?

DailyMed says it has substantive neuroleptic activity even though it is not labeled as an antipsychotic. Dopamine D2/D4 block can cause involuntary movements and, rarely, neuroleptic malignant syndrome.

How long does amoxapine take to work?

MedlinePlus: several weeks or longer for the full effect. StatPearls cites older data that some people improve within about a week and most responders improve within two weeks. Stay on the prescribed plan unless your clinician changes it.

Can I get amoxapine through telehealth?

A licensed clinician can prescribe it when it is medically appropriate. Many follow-up visits can happen by video. New starts still need a full history, and some people need an ECG or in-person exam first. See online depression treatment options.