Dextroamphetamine/Amphetamine (Adderall, Adderall XR, Mydayis)

Reviewed by the HeyPsych Medical Review Board

Board-certified psychiatrists and mental health professionals

Published September 16, 2026•Updated September 16, 2026

Clinical summary for Dextroamphetamine/Amphetamine (Adderall, Adderall XR, Mydayis): Adderall-type stimulants can seriously improve attention, follow-through, and daytime functioning. They can also crank up insomnia, appetite loss, jitteriness, and irritability—especially if the dose is too high or timing is off. This medication is a Schedule II controlled substance for a reason: misuse can lead to overdose and death. If you have a history of substance use, bipolar disorder, psychosis, tics, or heart disease, your prescriber should treat that as a big deal and plan monitoring accordingly.

What It's Used For

Adderall-type mixed amphetamine salts are prescribed to treat ADHD—especially when distractibility, impulsivity, and executive dysfunction are wrecking school, work, or relationships. The immediate-release form is also FDA-approved for narcolepsy (daytime sleepiness).

Primary Indications

ADHD: Improve attention, task initiation, follow-through, and impulse controlNarcolepsy (IR only): Reduce excessive daytime sleepiness

Off-Label Uses

Cocaine use disorder (alternative agent, typically extended-release; specialist-level monitoring recommended)

What People Feel

Here’s the real-world vibe people report. Not everyone feels all of this, but the patterns are common:

Focus turns on (when it’s the right dose)

"My brain got quieter. I could actually pick one thing and stay with it."

How Fast It Works

Stimulants aren’t like antidepressants—you don’t wait weeks to know if it’s doing something. Timing depends heavily on the formulation.

Same day

Many people notice effects the first day (especially with IR)

Immediate-release (IR)

Typically lasts 4-6 hours

Adderall XR

Typically lasts 8-12 hours

Mydayis

Can last up to ~16 hours (which is great for coverage, but can be brutal for insomnia if timing is off)

Extended-release timing is less “instant,” more gradual—expect a smoother ramp up and longer tail

How Well It Works

ADHD Symptom Improvement (Functional Outcomes)

Often strong

vs Placebo (significantly lower)

Stimulants are one of the most consistently effective medication classes in psychiatry for ADHD. The point isn’t just symptom scores—it’s whether you can start tasks, finish tasks, regulate attention, and show up more consistently in your real life. If you’re only getting side effects, your plan needs a rethink (dose, timing, formulation, sleep, anxiety, or whether a different medication fits better).

Critical Safety Information

This is a Schedule II controlled substance. Misuse can cause overdose and death.

→Take it early. Late dosing is one of the fastest ways to accidentally create insomnia.
→Track appetite and weight. If you’re not eating, your mood and anxiety often pay the price.
→Tell your prescriber immediately about chest pain, fainting, severe shortness of breath, or a racing heart that feels abnormal.
→If you develop hallucinations, paranoia, or manic symptoms (no sleep + wired + grandiose/impulsive), stop and contact your prescriber urgently.
→Lock it up. Don’t share it. Don’t “experiment” with routes of use. That’s how people end up in the ER—or worse.
→Avoid dehydration and be cautious with intense exercise if you notice palpitations or dizziness.

Side Effects

Most common: appetite loss, insomnia, headache, dry mouth, and feeling jittery or on-edge. Many side effects are dose-, timing-, and formulation-dependent.

Common Things People Notice

Decreased appetite and weight loss
Insomnia (especially if taken too late)
Headache
Dry mouth
Anxiety, jitteriness, or irritability
Stomach upset (nausea, abdominal pain, constipation or diarrhea)
Increased heart rate or palpitations

Common Side Effects

Common (varies by age and dose)

Appetite suppression / Weight loss— This is the side effect that sneaks up on people. If you’re skipping meals, your anxiety, mood, and sleep often get worse. For kids, weight and growth need to be treated as core safety outcomes—not an afterthought.

Common (timing-sensitive)

Insomnia— If you’re taking it late or the duration is longer than your day, sleep gets wrecked. Once sleep goes, everything else follows (irritability, anxiety, focus). Timing and formulation matter a lot here.

Common

Headache— Often related to dehydration, not eating, or the medication wearing off. Hydration + food + smoother coverage can help.

1% to 10% (varies)

Anxiety / Agitation / Irritability— This usually means the dose is too high, the timing is off, caffeine is stacking, sleep is insufficient, or there’s untreated anxiety underneath. The fix is adjustment—not just pushing through.

Common (especially in adults)

Dry mouth— Annoying but manageable: water, sugar-free gum, and dental care matter more than people think.

1% to 10% (varies)

Palpitations / Increased heart rate— Stimulants can raise heart rate and blood pressure. If it feels intense, scary, or new—don’t ignore it. Dose and medical screening matter.

⚠️ Serious Side Effects

Cardiovascular events: acute MI, stroke, sudden cardiac death (rare but high-stakes), especially with underlying heart disease or misuse/overdose
Psychosis or mania: hallucinations, paranoia, delusions, manic escalation (can occur at therapeutic doses)
Serotonin syndrome (when combined with serotonergic agents): agitation, sweating, tremor, diarrhea, fever, confusion—medical emergency
Peripheral vasculopathy (Raynaud phenomenon): painful, color-changing digits; rare cases with ulceration/skin breakdown
Severe weight loss or growth suppression in pediatrics (risk is higher for extended-release products in children <6)
Rhabdomyolysis (rare): muscle pain/weakness, dark urine—medical emergency
Priapism (rare): prolonged painful erection—medical emergency

Critical Drug Interactions

Stimulants interact in two main ways: (1) they can dangerously stack stimulation or serotonin effects, and (2) they can be pushed up or down depending on metabolism and urinary pH.

With: MAOIs (including linezolid or IV methylene blue)

Risk: Contraindicated. Risk of dangerously high blood pressure, hyperthermia, and severe reactions.

Action: Do not use within 14 days of MAOI therapy.

With: SSRIs/SNRIs/other serotonergic meds (eg, duloxetine, venlafaxine, sertraline, fluoxetine; also triptans, tramadol, some migraine meds)

Risk: Higher serotonin syndrome risk, especially with higher doses or multiple serotonergic agents.

Action: Use with caution. Educate on early warning signs (agitation, sweating, tremor, diarrhea, fever) and seek urgent care if they appear.

With: CYP2D6 inhibitors (eg, fluoxetine, paroxetine, bupropion; some antipsychotics)

Risk: Can raise amphetamine exposure in some patients, increasing side effects (anxiety, insomnia, HR/BP effects).

Action: Consider lower starting doses and slower titration; monitor side effects closely.

With: Acidic foods/juices or vitamin C

Risk: May reduce serum levels and shorten effect in some people.

Action: If you notice the medication feels weaker when taken with acidic drinks, separate timing and monitor response.

With: Urinary alkalinizing agents (eg, sodium bicarbonate) or alkalinizing diets

Risk: Can slow elimination and increase exposure, potentially increasing side effects.

Action: Avoid manipulating urinary pH to change stimulant effects. Tell your prescriber about supplements.

With: Other stimulants (including high caffeine, nicotine, decongestants like pseudoephedrine)

Risk: Stacks stimulation: more anxiety, insomnia, palpitations, blood pressure rise.

Action: Limit caffeine and avoid combining with other stimulants unless your clinician explicitly plans for it.

With: Antihypertensives

Risk: Stimulants can counteract blood pressure-lowering effects.

Action: Monitor BP/HR; adjust treatment plan if BP rises.

Safe Discontinuation

Stimulants don’t have the same seizure-risk withdrawal pattern as benzodiazepines, but stopping abruptly—especially after high doses or long-term daily use—can cause a crash: intense fatigue, low mood, irritability, and sleep changes. If you’re discontinuing, a planned step-down is often smoother.

Key Points

Common “crash” symptoms: fatigue, depressed mood, increased appetite, sleepiness, brain fog
Higher risk of a rough landing: higher doses, long duration of daily use, underlying depression or substance use
Typical approach: gradual dose reduction over days to weeks if you’ve been on a steady daily regimen
If stopping is due to serious side effects (psychosis/mania, severe cardiovascular symptoms): the plan may be urgent—follow medical guidance

Dosing Information

Adult Dosing

adhd ir initial: 5 mg PO once or twice daily (morning; second dose early afternoon if used)

adhd ir titration: Increase total daily dose by 5 to 10 mg at intervals of at least 1 week based on response and tolerability

adhd ir usual max: 40 mg/day in 1 to 2 divided doses

adhd ir selected patients max: Up to 60 mg/day may be used in selected patients with close monitoring when clinically necessary

adhd er initial: 10 to 20 mg PO once daily in the morning

adhd er titration: Increase by 10 to 20 mg at intervals of at least 1 week based on response and tolerability

adhd er usual max: 40 mg/day (higher doses increase adverse effect burden)

adhd er selected patients max: Up to 60 mg/day may be used in selected patients with close monitoring when clinically necessary

triple bead er initial: 12.5 mg PO once daily in the morning

triple bead er titration: Increase by 12.5 mg at intervals of at least 1 week based on response and tolerability

triple bead er max: 50 mg/day

narcolepsy ir initial: 10 mg PO once daily in the morning

narcolepsy ir titration: Increase by 10 mg weekly until optimal response

narcolepsy ir typical range: 20 to 60 mg/day in 1 to 3 divided doses (avoid late doses to reduce insomnia)

cocaine use disorder er initial: 10 to 20 mg PO once daily (sometimes combined with topiramate) (off-label)

cocaine use disorder er titration: Increase by 10 mg weekly based on response and tolerability (off-label)

cocaine use disorder er max: 60 mg/day (off-label; requires close monitoring)

Simple Explanation

Immediate-release (IR) is shorter (often 4-6 hours) and can be dosed 1-3 times/day, while extended-release (XR/ER) is designed for once-daily coverage. Longer coverage can mean fewer ups/downs—but also more insomnia if the medication outlasts your day.

Pregnancy, Breastfeeding, Special Groups

Stimulants require extra caution in pregnancy, breastfeeding, younger children, and anyone with cardiac risk or psychiatric vulnerability (bipolar disorder, psychosis, substance use history).

👶Pregnancy

Human outcome data exist, but there are still meaningful concerns: stimulants can cause vasoconstriction and may reduce placental perfusion. Use during pregnancy may be associated with risks like low birth weight or premature birth, and newborns may show withdrawal-like symptoms (agitation, irritability, feeding issues, excessive drowsiness). Nonpharmacologic options are preferred for mild-to-moderate ADHD during pregnancy. If medication is used, shared decision-making matters: lowest effective dose, simplest regimen, and careful monitoring.

🤱Breastfeeding

Amphetamine and dextroamphetamine pass into breast milk. Reported relative infant dose ranges are variable, and manufacturers generally do not recommend breastfeeding due to potential infant risks (blood pressure/heart rate effects, irritability, poor feeding, sleep disruption, growth concerns). If treatment is considered essential, risk-benefit decisions should be individualized with infant monitoring for feeding difficulties, irritability, and insomnia.

👧Children & Adolescents (Under 18)

Extended-release stimulants: Not recommended for children younger than 6 years because younger kids can have higher plasma exposure and higher rates of adverse reactions, including clinically significant weight loss. If a child <6 is experiencing weight loss or other adverse effects on an extended-release stimulant, clinicians should consider stopping and/or switching to an alternative (like an immediate-release formulation). For all pediatric patients, growth (height/weight), appetite, sleep, and behavior need routine tracking.

👴Older Adults (65+)

Refer to adult dosing but start low and go slow. Older adults may be more sensitive to blood pressure/heart rate effects, insomnia, and appetite/weight changes. Cardiac screening and BP/HR monitoring become especially important.

🔬Liver Impairment

No formal manufacturer dose adjustments are provided, but use caution; reduced elimination can increase exposure and side effects.

💧Kidney Impairment

Use caution. For certain extended-release products, severe renal impairment requires lower dosing limits and end-stage renal disease may make use not recommended.

Clinical Monitoring

Baseline cardiac assessment: personal and family history of sudden death or ventricular arrhythmia; ECG if indicated by history/exam
Blood pressure and heart rate: baseline, after dose changes, and periodically during treatment
Weight and appetite: baseline and routinely (adults); height/weight growth tracking in children and adolescents
Sleep: onset insomnia, shortened sleep duration, delayed bedtime, and rebound sleepiness; adjust timing/formulation accordingly
Mood and behavior: irritability, anxiety, emotional lability; screen for depression and suicidality when clinically indicated
Psychosis/mania monitoring: new hallucinations, paranoia, delusions, or manic escalation; screen for bipolar risk before starting
Substance use risk: assess before prescribing and monitor throughout (early refills, dose escalation, lost prescriptions, multiple prescribers, non-oral routes)
Peripheral vasculopathy: cold/painful/color-changing digits; evaluate persistent symptoms and reduce dose or discontinue if needed
Tics/Tourette symptoms: assess history before starting; monitor for tic worsening during treatment

Available Formulations

Immediate-release tablets (Adderall and generics): 5 mg, 7.5 mg, 10 mg, 12.5 mg, 15 mg, 20 mg, 30 mg
Extended-release capsules (Adderall XR and generics): 5 mg, 10 mg, 15 mg, 20 mg, 25 mg, 30 mg
Triple-bead extended-release capsules (some generics/brands): 12.5 mg, 25 mg, 37.5 mg, 50 mg
Mydayis extended-release capsules: 12.5 mg, 25 mg, 37.5 mg, 50 mg
Administration option for some ER capsules: swallow whole or open and sprinkle beads on applesauce and consume immediately (do not chew; do not divide the capsule contents)

Mechanism of Action

Amphetamines boost catecholamine signaling—mainly dopamine and norepinephrine—by increasing their release and reducing reuptake. In ADHD terms: they help the brain’s attention and self-regulation circuits stay online longer, so focus, planning, and impulse control require less brute force.

Place in Treatment Algorithm

For ADHD, stimulants are commonly first-line because the benefits can be fast and meaningful. The trade-off is tolerability and risk management: appetite, sleep, anxiety/irritability, cardiovascular monitoring, and misuse risk. If you have significant anxiety, bipolar disorder risk, psychosis history, active substance use, or cardiac disease, the decision is more nuanced and sometimes an alternative (non-stimulant ADHD meds and behavioral strategies) fits better.

Frequently Asked Questions

What is Adderall used for?

Adderall-type mixed amphetamine salts are primarily used for ADHD. The goal is better attention, task initiation, follow-through, and impulse control—without feeling overstimulated. Immediate-release Adderall is also FDA-approved for narcolepsy-related daytime sleepiness.

How long does Adderall last?

Immediate-release (IR) commonly lasts 4-6 hours. Adderall XR often lasts 8-12 hours. Mydayis can last up to about 16 hours. Your actual duration depends on metabolism, dose, sleep, food, and whether you’re taking other meds that affect clearance.

Will Adderall make my anxiety worse?

It can. Stimulants may increase physical anxiety (jitteriness, faster heart rate) and irritability—especially at higher doses, with poor sleep, or with caffeine stacking. If anxiety ramps up, the fix is usually a dosing/timing/formulation adjustment (and treating underlying anxiety), not simply pushing through.

Why do stimulants cause appetite loss and weight loss?

They commonly reduce appetite and can delay hunger cues, so people unintentionally eat less. In kids, long-term appetite suppression can affect growth, which is why height/weight monitoring is part of standard care.

What’s the July 2025 FDA safety update about extended-release stimulants in kids under 6?

The FDA reported that children younger than 6 taking extended-release stimulants (including amphetamine- and methylphenidate-based ER products) can have higher drug exposure in the body and higher rates of side effects than older children—including clinically significant weight loss (≥10%). Labeling is being updated to reflect this. If a child under 6 is having weight loss or other adverse reactions on an extended-release stimulant, clinicians should consider stopping it and/or switching to an alternative (like an immediate-release option).

Is Adderall addictive?

It can be. Adderall is Schedule II because it has high misuse potential. Misuse can lead to substance use disorder, overdose, and death—especially with higher doses or non-oral routes. Even when taken as prescribed, your clinician should monitor for misuse signals and keep the plan honest and safe.

Can I take Adderall with an SSRI or SNRI?

Sometimes, yes—but it needs monitoring. Combining stimulants with serotonergic meds can raise the risk of serotonin syndrome (rare, but serious), and some antidepressants can increase amphetamine exposure. If you’re on both, your prescriber should be thoughtful about dose, titration speed, and symptom monitoring.

What’s the difference between Adderall XR and Mydayis?

Both are extended-release amphetamine mixed salts, but their release designs and duration can differ. Adderall XR commonly covers 8-12 hours; Mydayis can last up to ~16 hours. The trade-off for longer coverage is often more insomnia risk if timing is off. They are not interchangeable mg-for-mg.

Can Adderall cause psychosis or mania?

Yes, in rare cases. Stimulants can trigger new psychotic symptoms (hallucinations, paranoia) or manic symptoms, especially in people with bipolar risk, psychosis history, or substance use vulnerability. If these symptoms appear, it’s urgent—contact your prescriber immediately and don’t keep taking it hoping it settles.

How do I stop Adderall safely?

If you’ve been taking it daily at steady doses, stopping suddenly can cause a crash—fatigue, low mood, irritability, and sleep changes. Many people do better with a gradual step-down plan. If you’re stopping because of severe side effects (psychosis/mania, major cardiovascular symptoms), your clinician may advise an immediate stop and urgent evaluation.

Why does it feel like it wears off and I crash?

Wearing off can bring rebound ADHD symptoms, fatigue, headache, or mood drop. This can improve with smoother extended-release coverage, better meal timing, hydration, sleep stabilization, or a medication schedule adjustment. If you’re crashing hard every day, that’s a solvable problem—not something you should just accept.

This treatment information is for educational purposes only. Treatment decisions should be made in consultation with qualified healthcare professionals based on individual circumstances, symptoms, and medical history. Do not attempt treatment without professional guidance.

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Dextroamphetamine/Amphetamine (Adderall, Adderall XR, Mydayis)

Reviewed by the HeyPsych Medical Review Board

Board-certified psychiatrists and mental health professionals

Published September 16, 2026•Updated September 16, 2026