Phenelzine — Uses, Dosage, Side Effects & Safety

Drug class: Monoamine Oxidase Inhibitor (MAOI) Antidepressant

Overview

Phenelzine is a prescription medication used to treat depression, especially when other treatments have not been effective. It belongs to a group of medicines called monoamine oxidase inhibitors (MAOIs), which work by increasing certain natural chemicals in the brain that help maintain mental balance. This medication is typically used for major depressive disorder, particularly with features such as anxiety or atypical symptoms. Phenelzine may also be used off-label for certain anxiety disorders. Patients should be aware that this medicine requires dietary restrictions and careful monitoring due to the risk of serious interactions with certain foods and other medications.

For related Phenelzine guidance, compare Tranylcypromine.

Frequently Asked Questions about Phenelzine

What is phenelzine used for?

Phenelzine is primarily used to treat major depressive disorder, especially when other antidepressants have not been effective. It may also be used off-label for certain anxiety disorders.

How does phenelzine work?

Phenelzine works by inhibiting the enzyme monoamine oxidase, which increases levels of neurotransmitters like serotonin, norepinephrine, and dopamine in the brain. This helps improve mood and reduce symptoms of depression.

What foods should I avoid while taking phenelzine?

Avoid foods high in tyramine, such as aged cheeses, cured meats, fermented foods, soy products, and some alcoholic beverages. These can cause dangerous increases in blood pressure.

What are the signs of a hypertensive crisis?

Signs include severe headache, rapid heartbeat, chest pain, neck stiffness, nausea, vomiting, and vision changes. Seek emergency medical attention if these occur.

Can I take other antidepressants with phenelzine?

No, do not take other antidepressants (SSRIs, SNRIs, tricyclics) with phenelzine or within 14 days of stopping either medication, due to the risk of serious interactions.

How long does it take for phenelzine to work?

It may take several weeks (typically 2–4 weeks) to notice improvement in depressive symptoms. Continue taking the medication as prescribed and consult your doctor if you have concerns.

Is phenelzine safe during pregnancy or breastfeeding?

Phenelzine is generally not recommended during pregnancy or breastfeeding due to potential risks to the baby. Discuss with your healthcare provider for individual assessment.

Educational information only. Always consult a qualified healthcare professional before starting, stopping, or changing any medication.