Nuvigil Drug Interactions: What to Avoid and What to Tell Your Doctor

Nuvigil (armodafinil) can interact with dozens of other medications — some interactions are minor inconveniences, while others are potentially dangerous. Because armodafinil affects liver enzymes that process many common drugs, it can alter the levels of other medications in your body in ways that are hard to predict without knowing your full medication list. Here's what you need to know.

Why Does Nuvigil Interact With So Many Drugs?

Armodafinil is metabolized in the liver and has two main effects on liver enzymes that process drugs: (1) it inhibits CYP2C19 (which can increase levels of certain drugs metabolized by this enzyme), and (2) it moderately induces CYP3A4 (which speeds up the breakdown of drugs metabolized by this enzyme, reducing their effectiveness). This two-way effect on drug metabolism is the primary reason armodafinil has so many potential interactions.

Contraindicated Combinations: Do Not Take Together

MAO inhibitors (MAOIs) — CONTRAINDICATED: Taking armodafinil with MAOIs (phenelzine, tranylcypromine, isocarboxazid, selegiline transdermal) creates a risk of acute hypertensive crisis — a sudden and dangerous spike in blood pressure. Do not combine these medications. If transitioning from an MAOI to armodafinil, ask your doctor about the appropriate washout period.

Medications That May Be Less Effective When You Take Nuvigil

Because armodafinil induces CYP3A4, it speeds up the breakdown of many CYP3A4 substrates, potentially reducing their effectiveness:

Hormonal contraceptives (MAJOR concern): Pills, patches, implants, injections, rings, and IUDs containing estrogen or progestin may become less effective. Use a backup non-hormonal method (condoms, diaphragm) during treatment and for 1 month after stopping armodafinil.

Cyclosporine (Gengraf, Neoral, Sandimmune): An immunosuppressant used after organ transplants. Armodafinil can significantly reduce cyclosporine levels, potentially leading to organ rejection. Patients on cyclosporine who need armodafinil require close monitoring and possible dose adjustment.

Midazolam (Versed) and triazolam (Halcion): Benzodiazepines used for sedation. Armodafinil reduces their blood levels, which may decrease their sedative effect.

Carbamazepine (Tegretol), rifampin (Rifadin), and phenobarbital: These powerful CYP3A4 inducers can increase armodafinil's own metabolism, potentially reducing armodafinil's effectiveness. Your prescriber may need to adjust your armodafinil dose.

Medications That May Reach Higher Levels When You Take Nuvigil

Because armodafinil inhibits CYP2C19, it can increase levels of drugs processed by this enzyme — sometimes to toxic levels:

Omeprazole (Prilosec) and other proton pump inhibitors: Armodafinil can increase omeprazole levels by approximately 40%. Your doctor may need to adjust your PPI dose.

Warfarin (Coumadin): A blood thinner (anticoagulant). Armodafinil may increase warfarin levels, raising the risk of bleeding. More frequent INR monitoring is recommended when starting or stopping armodafinil.

Tricyclic antidepressants (imipramine, desipramine, clomipramine): Armodafinil may increase levels of these antidepressants. Dose monitoring may be needed.

Phenytoin (Dilantin): An anti-seizure medication. Armodafinil may increase phenytoin levels, raising the risk of phenytoin toxicity. Close monitoring is essential.

Diazepam (Valium): A benzodiazepine; armodafinil may increase its levels and prolong its effects.

Propranolol (Inderal): A Special Note

Armodafinil may increase propranolol levels. Propranolol is used for high blood pressure, heart conditions, migraines, and performance anxiety. If you take propranolol, your doctor should monitor your blood pressure and heart rate more closely when armodafinil is started or stopped.

Alcohol and Supplements

Alcohol: Avoid alcohol while taking armodafinil. Any CNS-active medication can alter judgment and coordination, and alcohol may worsen dizziness. The interaction is not fully characterized, but caution is recommended.

St. John's Wort: A CYP3A4 inducer that can reduce armodafinil blood levels, potentially reducing effectiveness. Tell your doctor if you take any herbal supplements.

What to Tell Your Doctor

Before starting Nuvigil, give your doctor and pharmacist a complete list of everything you take, including:

All prescription medications (especially blood thinners, antidepressants, anti-seizure drugs, immunosuppressants, and cardiovascular medications)

All over-the-counter medications, including antacids (omeprazole, etc.)

Your method of contraception if you are using hormonal birth control

All vitamins, minerals, and herbal supplements (including St. John's Wort, melatonin, and others)

For a full list of side effects to watch for while on Nuvigil, see our guide to Nuvigil side effects. And if you need help finding your prescription in stock, medfinder can locate nearby pharmacies with armodafinil available.