When You Can't Fill Your Amoxapine Prescription

If you've been searching for Amoxapine at your pharmacy and keep hearing "out of stock," you may be wondering: what are my options? With an ongoing shortage and only one manufacturer producing this medication in the US, some patients have gone weeks without being able to fill their prescriptions.

Going without your antidepressant isn't an option — and it can be dangerous to stop abruptly. The good news is that there are several alternative medications in the same drug class that your doctor may consider. In this article, we'll cover what Amoxapine does, how it works, and what alternatives might work for you.

What Is Amoxapine and What Does It Treat?

Amoxapine is a tricyclic antidepressant (TCA) that was originally sold under the brand name Asendin. It's FDA-approved for treating depression, including treatment-resistant depression and depression accompanied by anxiety, agitation, or psychotic features.

Amoxapine is typically prescribed as a second- or third-line treatment — meaning patients usually try SSRIs (like Sertraline or Escitalopram) or SNRIs (like Venlafaxine or Duloxetine) first, and turn to Amoxapine when those medications don't work well enough.

For a complete overview of this medication, see our article on what is Amoxapine.

How Does Amoxapine Work?

Amoxapine works primarily by blocking the reuptake of norepinephrine at nerve synapses in the brain. This increases the amount of norepinephrine available, which helps improve mood and energy levels.

What makes Amoxapine unique among TCAs is that it also blocks dopamine D2 and D4 receptors. This gives it mild antipsychotic properties, which can be helpful for patients whose depression includes psychotic features like delusions or severe agitation.

Amoxapine has a relatively fast onset of action compared to other antidepressants — some patients notice improvement within 7 days, and over 80% experience significant improvement within 2 weeks.

Learn more in our detailed article on how Amoxapine works.

Alternatives to Amoxapine

If you can't find Amoxapine, your doctor may recommend switching to another tricyclic antidepressant. Here are the most commonly considered alternatives:

1. Nortriptyline (Pamelor)

Nortriptyline is a secondary amine TCA that is one of the most commonly prescribed tricyclic antidepressants today. It works by blocking the reuptake of norepinephrine, similar to Amoxapine, though it lacks Amoxapine's dopamine-blocking properties.

Why it might work for you:

• Generally better tolerated than many other TCAs
• Causes less sedation and fewer anticholinergic side effects (dry mouth, constipation) than older TCAs
• Well-studied for both depression and neuropathic pain
• Widely available as a generic — rarely in shortage

Typical dose: 25–150 mg per day

Approximate cost: $10–$30 for a 30-day supply (generic)

2. Desipramine (Norpramin)

Desipramine is another secondary amine TCA that is highly selective for norepinephrine reuptake inhibition. It has the least anticholinergic activity of all the TCAs, making it a good option for patients who are sensitive to side effects like dry mouth, constipation, and urinary retention.

Why it might work for you:

• Most norepinephrine-selective TCA available
• Fewest anticholinergic side effects in its class
• Less sedating than Amoxapine
• Available as generic tablets

Typical dose: 100–200 mg per day

Approximate cost: $15–$45 for a 30-day supply (generic)

3. Doxepin (Silenor)

Doxepin is a TCA with strong antihistamine properties, which makes it particularly sedating at higher doses. It's FDA-approved for both depression and insomnia (at lower doses). If your depression involves significant insomnia, Doxepin might be a particularly good alternative.

Why it might work for you:

• Effective for depression with co-occurring insomnia
• Strong antihistamine action helps with sleep
• Available in multiple formulations including capsules and liquid
• Widely available as a generic

Typical dose: 75–150 mg per day for depression; 3–6 mg per day for insomnia

Approximate cost: $10–$25 for a 30-day supply (generic, depression dose)

4. Imipramine (Tofranil)

Imipramine is one of the oldest and most well-studied tricyclic antidepressants. It works by blocking the reuptake of both norepinephrine and serotonin. While it has more side effects than some newer TCAs, it has a long track record of effectiveness.

Why it might work for you:

• Decades of clinical evidence supporting its effectiveness
• Dual norepinephrine and serotonin activity
• Also used for panic disorder and enuresis (bedwetting)
• Inexpensive and widely available

Typical dose: 75–200 mg per day

Approximate cost: $10–$30 for a 30-day supply (generic)

Important Things to Know About Switching

Switching antidepressants is not as simple as swapping one pill for another. Here's what you should keep in mind:

• Never switch on your own. Always work with your prescribing doctor to transition safely between medications.
• Tapering may be needed. Your doctor will likely taper you off Amoxapine gradually to avoid withdrawal symptoms before starting the new medication.
• Give it time. A new antidepressant may take 2–6 weeks to reach full effectiveness. Don't get discouraged if you don't feel better immediately.
• Watch for side effects. Different TCAs have different side effect profiles. Report any new or concerning symptoms to your doctor.
• Amoxapine's dopamine-blocking properties are unique. If this feature was important for your treatment (for example, if you have depression with psychotic features), your doctor will need to account for that when choosing an alternative.

For more information about Amoxapine's side effects and what to watch for, see our article on Amoxapine side effects.

What About Non-TCA Alternatives?

If your doctor decides that a tricyclic antidepressant isn't the right path forward, other classes of antidepressants may be considered:

• SNRIs like Venlafaxine (Effexor) or Duloxetine (Cymbalta) also affect norepinephrine, similar to TCAs
• Atypical antidepressants like Bupropion (Wellbutrin) or Mirtazapine (Remeron) work through different mechanisms
• MAO inhibitors like Phenelzine (Nardil) are reserved for severe treatment-resistant cases and require dietary restrictions

Final Thoughts

Not being able to fill your Amoxapine prescription is stressful, especially when you depend on it to manage your depression. But you have options. Several other tricyclic antidepressants offer similar benefits and are more widely available.

The most important step is to talk to your doctor as soon as possible. Don't wait until you've completely run out of medication. Together, you and your prescriber can find a safe alternative that keeps your treatment on track.

In the meantime, you can use Medfinder to check whether Amoxapine is available at pharmacies near you. And for more information on drug interactions to be aware of when switching, see our guide on Amoxapine drug interactions.