Azstarys (Dexmethylphenidate/Serdexmethylphenidate) Drug Interactions: What to Avoid and What to Tell Your Doctor

Before starting Azstarys (dexmethylphenidate/serdexmethylphenidate), it's critical to tell your doctor and pharmacist about every medication, supplement, and herbal product you take. Some combinations can cause serious or even life-threatening reactions. This guide covers the most important drug interactions associated with Azstarys.

CONTRAINDICATED Interaction: MAO Inhibitors (MAOIs) — AVOID

The most critical drug interaction with Azstarys is with

monoamine oxidase inhibitors (MAOIs). Taking Azstarys with an MAOI — or within 14 days of stopping one — can cause a

hypertensive crisis — a sudden, severe spike in blood pressure that can lead to stroke, heart attack, aortic dissection, and death. This combination is contraindicated.

MAOIs include:

Phenelzine (Nardil)

Tranylcypromine (Parnate)

Isocarboxazid (Marplan)

Selegiline (Zelapar, Emsam) — note: some forms are low-risk, but avoid all forms when taking Azstarys

Linezolid (Zyvox) — an antibiotic with MAOI properties

Methylene blue — sometimes used as a diagnostic agent or surgical dye

Major Interaction: Halogenated Anesthetics — Inform Your Surgeon

Certain anesthetics used during surgery — called halogenated or volatile anesthetics — can interact dangerously with dexmethylphenidate:

Sevoflurane (Sojourn)

Desflurane (Suprane)

Halothane, isoflurane, enflurane

These combinations can increase the risk of dangerously high blood pressure or abnormal heart rhythms during surgery. If you're having any surgical procedure, inform your anesthesiologist and surgical team that you take Azstarys. Your prescriber will likely advise you not to take your Azstarys dose the morning of surgery.

Moderate Interactions: Blood Pressure Medications

Azstarys can reduce the effectiveness of antihypertensive (blood pressure lowering) medications, because stimulants tend to raise blood pressure. If you take any of the following, your blood pressure may need closer monitoring or your antihypertensive dose may need adjustment:

ACE inhibitors (lisinopril, ramipril, enalapril)

Angiotensin II receptor blockers/ARBs (losartan, valsartan)

Beta-blockers (metoprolol, atenolol, propranolol)

Calcium channel blockers (amlodipine, diltiazem)

Thiazide diuretics (hydrochlorothiazide)

Alpha-2 agonists (clonidine, guanfacine — often used as ADHD adjuncts)

Moderate Interactions: Antidepressants and Psychiatric Medications

Tricyclic antidepressants (TCAs) (amitriptyline, clomipramine, imipramine): Can increase or unpredictably alter the effects of stimulants. Monitor closely.

SSRIs and SNRIs (fluoxetine, sertraline, venlafaxine): Azstarys may slow their metabolism, potentially increasing their levels. There is also a theoretical risk of serotonin syndrome — watch for agitation, rapid heart rate, high temperature, or confusion.

Antipsychotics (risperidone, quetiapine, haloperidol): May antagonize stimulant effects. Stimulants may also worsen extrapyramidal symptoms. Monitor carefully.

Moderate Interactions: Acid-Reducing Medications

Medications that raise gastric pH (reduce stomach acid) can affect how Azstarys is absorbed, potentially increasing drug levels:

H2 blockers: Famotidine (Pepcid), cimetidine (Tagamet)

Proton pump inhibitors (PPIs): Omeprazole (Prilosec), pantoprazole (Protonix) — though the interaction with extended-release forms is less clear

Interactions to Know: Opioid Pain Medications

Combining Azstarys with opioid medications (such as hydrocodone/acetaminophen combinations like Vicodin) is a serious interaction. Both substances affect the central nervous system in opposing ways, and the combination can mask respiratory depression or lead to dangerous outcomes. This combination should be used only when absolutely necessary, at minimum doses, and with close monitoring.

What to Tell Your Doctor Before Starting Azstarys

Always disclose:

All prescription medications, including controlled substances

All over-the-counter medications (including acid reducers, antihistamines, decongestants)

All herbal supplements (especially St. John's Wort, which has MAOI-like activity)

Upcoming surgical procedures or anesthesia

Pregnancy, plans to become pregnant, or breastfeeding status

For more detail on Azstarys side effects and warnings, see: Azstarys Side Effects: What to Expect and When to Call Your Doctor. And if you need help finding Azstarys at a pharmacy near you,

medfinder can help.