What Is Tranylcypromine? Uses, Dosage, and What You Need to Know in 2026

Tranylcypromine — sold under the brand name Parnate — is an antidepressant that has been prescribed since 1961. It belongs to a class of drugs called monoamine oxidase inhibitors (MAOIs), and it remains one of the most effective options available for patients with treatment-resistant depression. This guide covers the essentials: what tranylcypromine is, how it's used, how it's dosed, and what to know before starting it.

What Is Tranylcypromine?

Tranylcypromine is a monoamine oxidase inhibitor (MAOI) — a class of drug that works by blocking the enzyme monoamine oxidase, which normally breaks down neurotransmitters like serotonin, dopamine, and norepinephrine. By inhibiting this enzyme, tranylcypromine increases the availability of these mood-regulating chemicals in the brain.

Unlike SSRIs (selective serotonin reuptake inhibitors like fluoxetine or sertraline) that selectively boost one neurotransmitter, tranylcypromine broadly affects all three major monoamine systems. This broader activity is partly why it can be effective when other antidepressants have failed.

What Is Tranylcypromine FDA-Approved to Treat?

Tranylcypromine is FDA-approved for the treatment of major depressive disorder (MDD) in adult patients who have not responded adequately to other antidepressants. It is specifically not indicated as a first-line treatment due to its complex safety profile.

Off-label uses that are supported by clinical evidence include:

Treatment-resistant depression (after multiple other agents have failed)

Atypical depression (depression with mood reactivity, hypersomnia, leaden paralysis, or rejection sensitivity)

Treatment-resistant social anxiety disorder

Treatment-resistant panic disorder

How Is Tranylcypromine Dosed?

Tranylcypromine comes in 10 mg oral tablets (both brand Parnate and generic tranylcypromine sulfate). The standard dosing protocol is:

Starting dose: 30 mg per day in divided doses (typically 10 mg three times per day)

Dose increase: If there is no adequate response after 2 weeks, the dose may be increased by 10 mg every 1–3 weeks

Maximum dose: 60 mg per day; postural hypotension is a major concern at doses above 30 mg/day

Timing: Take the last dose no later than 3 PM to minimize insomnia; take with or without food

Onset: It may take 2 to 4 weeks to notice an improvement in mood; some patients require up to 6 weeks for a full response

Who Is Tranylcypromine For?

Tranylcypromine is a second-line (or later) treatment, intended for adults who have not had an adequate response to other antidepressants — typically including trials of at least two SSRIs or SNRIs. It is not for everyone, and it requires careful prescriber assessment.

It is specifically not appropriate for:

Children and adolescents (contraindicated in pediatric populations)

Patients with pheochromocytoma or catecholamine-releasing tumors

Patients currently taking SSRIs, SNRIs, TCAs, other MAOIs, or a long list of interacting medications

Patients with severe cardiovascular or cerebrovascular disease

The Tyramine Diet: A Critical Requirement

One of the most important things to know about tranylcypromine is the dietary restriction. Patients must follow a low-tyramine diet while taking tranylcypromine and for at least 2 weeks after stopping. Tyramine is a natural compound found in aged, fermented, or processed foods, and when it's not broken down normally by MAO, it can cause a dangerous spike in blood pressure called hypertensive crisis.

Foods to avoid include aged cheeses, cured or smoked meats (salami, pepperoni), fermented foods (sauerkraut, soy sauce, kimchi), fava beans, tap beers, Chianti wine, and overripe fruits. Your doctor and pharmacist will provide a complete list.

Brand vs. Generic Tranylcypromine

Brand Parnate and generic tranylcypromine sulfate contain the same active ingredient and are FDA-approved bioequivalents. The generic is substantially cheaper — available for $68–$75 per month with discount coupons, versus over $2,000 retail for brand Parnate at some pharmacies. Unless your prescriber specifies brand-only dispensing, generic is clinically equivalent and much more cost-effective.

For a deeper explanation of how tranylcypromine works at a molecular level, see: How Does Tranylcypromine Work? Mechanism of Action Explained in Plain English.

For a full review of side effects, see: Tranylcypromine Side Effects: What to Expect and When to Call Your Doctor.