Serdexmethylphenidate/Dexmethylphenidate (Azstarys)

What it treats

Azstarys is approved by the U.S. Food and Drug Administration for ADHD in patients 6 years and older. It sits in the methylphenidate family of stimulants, alongside Ritalin, Concerta, Focalin, and Jornay PM, and alongside the amphetamine family (Adderall, Vyvanse, dextroamphetamine).

The specific niche Azstarys fills is a once-daily methylphenidate-family option with a smooth pharmacokinetic profile. It's a reasonable choice for people who don't want a mid-day dose but haven't done well on the existing long-acting methylphenidate options.

How it works

Both parts of Azstarys deliver dexmethylphenidate to the brain. In the brain, dexmethylphenidate blocks the reuptake of dopamine and norepinephrine, the two chemical messengers most involved with attention and self-control. That raises their signaling, which improves focus and reduces impulsivity, usually within about 30 to 60 minutes of the immediate-release portion.

The prodrug portion (serdexmethylphenidate) is what makes Azstarys different from plain dexmethylphenidate. Serdexmethylphenidate isn't active in the intestine. It's cleaved gradually in the gut and bloodstream to release dexmethylphenidate over the day, which produces a smoother rise-and-fall than swallowing a straight extended-release capsule.

Receptor mechanism (detail)

Azstarys contains immediate-release dexmethylphenidate (30 percent of the total) plus serdexmethylphenidate, a prodrug (70 percent). Dexmethylphenidate itself is a dopamine and norepinephrine reuptake inhibitor at DAT and NET. Serdexmethylphenidate is a serotonergic-inactive precursor that requires enzymatic cleavage to release active dexmethylphenidate slowly over hours. The prodrug mechanism is intended to produce a smoother pharmacokinetic curve and, in principle, lower misuse liability by making rapid intravenous or intranasal delivery of the prodrug much less pharmacologically active than swallowing an equivalent immediate-release dose.

Potency and typical dosing pattern

Ranges are typical framework only, not a prescription for any individual.

Three fixed-dose capsule strengths are available: 26.1/5.2 mg, 39.2/7.8 mg, and 52.3/10.4 mg (serdexmethylphenidate/dexmethylphenidate). Starting dose is usually 39.2/7.8 mg once each morning, titrated up or down based on response. Duration is roughly 12 to 13 hours.

Safety monitoring

• Baseline and periodic blood pressure, heart rate, weight, and cardiac history, including family history of sudden cardiac death.
• Sleep, appetite, mood at each visit.
• Growth in children and adolescents. Height and weight at each visit.
• Schedule II controlled substance. Assess for misuse, diversion, and appropriate storage.
• Do not combine with MAOIs (hypertensive crisis).
• Cardiac history. Serious pre-existing structural heart disease warrants careful evaluation before starting.

What to expect

Common side effects

• Reduced appetite.
• Trouble sleeping.
• Stomach upset.
• Headache and dry mouth.
• Faster heartbeat.
• Feeling jittery, restless, or anxious.
• Mood changes.

If a side effect is bothersome or persistent, that's a conversation for the prescriber.

Serious side effects and warnings

Boxed warning. Stimulant ADHD medications, including Azstarys, carry an FDA boxed warning about potential for misuse, abuse, and addiction. Azstarys is a Schedule II controlled substance. Used as prescribed and monitored by a clinician, it has a record as an effective ADHD treatment.

• Cardiovascular effects. Stimulants raise heart rate and blood pressure. Caution with pre-existing cardiac disease.
• Worsening anxiety or agitation.
• Psychotic symptoms. Rare; urgent evaluation if new hallucinations or paranoid thoughts appear.
• Slowed growth in children. Height and weight tracked over time.
• Circulation problems in fingers and toes (Raynaud's-like), occasional.
• Priapism, rare.
• Tics. Can unmask or worsen tics in susceptible individuals.

Sexual side effects

Azstarys isn't a notable cause of sexual side effects. If a change occurs, mention it to a prescriber.

Weight, appetite, and sleep

Reduced appetite is common and can lead to weight loss. In children, growth is monitored. A good breakfast before the medication takes effect and food available later in the day help. Sleep planning matters; late doses are usually avoided.

Starting and dosing basics

This section is general background, not a dosing instruction for any individual. The right dose is a decision for a prescriber.

Azstarys comes as capsules that can be swallowed whole or opened and the contents sprinkled on soft food such as applesauce.

Missed doses and interactions

If a morning dose is missed, take it as soon as remembered unless it's past mid-morning, since late dosing can affect sleep. Don't double up.

As a Schedule II medication, prescriptions can't be refilled the standard way, and a new prescription is needed each time.

Do not combine with MAOIs. Other stimulants and blood pressure medications need prescriber attention. Give every prescriber and pharmacist the full medication list.

Stopping and tapering

Azstarys doesn't require a long taper. Coordinate stopping with a prescriber. Some people notice a period of tiredness or low mood after stopping, and ADHD symptoms are likely to return.

Pregnancy and breastfeeding

Individual circumstances matter, and the decision belongs with a clinician. Anyone pregnant, planning a pregnancy, or breastfeeding should discuss it with their prescriber.

Cost and generic availability

Azstarys is a newer, branded medication and is not yet available as a generic. Cost varies with insurance. The manufacturer offers copay assistance in some cases; a pharmacist or the prescriber can help work through coverage questions.

Common questions

How is Azstarys different from Focalin XR? Both deliver dexmethylphenidate over the day. Focalin XR uses a bead-based extended-release capsule with a biphasic release. Azstarys uses a prodrug (serdexmethylphenidate) that is slowly converted to dexmethylphenidate in the body, plus a small immediate-release dexmethylphenidate portion. The pharmacokinetic curves are different, and some people notice a smoother feel with one over the other.

Is the prodrug part less addictive? The prodrug design is intended to reduce misuse liability, because grinding and snorting or injecting serdexmethylphenidate doesn't produce a fast, active drug level the way immediate-release dexmethylphenidate would. It's still a Schedule II controlled substance with the same class-level warning.

Can I open the capsule? Yes. It can be opened and sprinkled on soft food such as applesauce for people who don't swallow capsules well.

How long does the effect last? Roughly 12 to 13 hours from a morning dose.

Questions to ask your prescriber

• Why Azstarys over other long-acting methylphenidate-family options?
• What are we hoping this treats, and how will we know it's working?
• Which side effects should I expect, and which ones should I call about?
• How will refills work?
• If we decide to stop it later, how would we do that?

Sources

This guide draws on current prescribing information and public health references and current as of June 8, 2026. It is reviewed for clinical accuracy and updated as guidance changes.

• U.S. Food and Drug Administration. Serdexmethylphenidate/dexmethylphenidate (Azstarys) prescribing information.
• MedlinePlus, U.S. National Library of Medicine. Dexmethylphenidate.
• National Institute of Mental Health. Mental health medications.
• American Academy of Pediatrics. ADHD Clinical Practice Guideline.
• American Psychiatric Association. Practice guidance on ADHD in adults.