Adderall

Mixed amphetamine salts · Stimulant (amphetamine)

Research reference only. Pepdex does not sell, supply or track this compound, and nothing here is guidance to use it — this page exists so the evidence and the risks are visible.

What it is

Prescription mixed amphetamine salts for ADHD and narcolepsy, and the most widely diverted "study drug" in the US. It reliably increases wakefulness, motivation and confidence in a session of work — which is exactly why its cognitive benefit is overestimated by the people using it.

How it works

Amphetamine works differently from most stimulants: rather than only blocking dopamine and noradrenaline reuptake, it enters the neuron and forces those transmitters out into the synapse. That is why its effects are stronger and its dependence liability higher than a pure reuptake blocker. In ADHD the therapeutic effect comes from raising catecholamine signalling in prefrontal circuits that regulate attention and impulse control. In people without ADHD the same pharmacology produces alertness and drive without a corresponding gain in the things people take it for — and the gap between how well you feel you are working and how well you actually are is one of the more consistent findings in the literature.

What human evidence shows

For diagnosed ADHD, effect sizes are large and the evidence is excellent. For neurotypical enhancement the literature is sobering: objective gains on complex cognition are small to absent, while users consistently RATE their own performance as improved — a documented perception gap. It improves task engagement more than task ability.

The studies, one by one

STRONG for short-term reduction of diagnosed ADHD symptoms under medical treatment. The certainty beyond that is weaker than the reputation suggests: a Cochrane review of 19 adult trials found symptom improvement but rated the evidence low to very low, with short follow-up, attrition problems and 16 of the 19 industry-funded.
In people WITHOUT ADHD: LIMITED for narrow laboratory endpoints and NONE SHOWN for the academic or occupational outcomes people actually take it for. Reviews find small benefits on selected tasks; a 60-person placebo-controlled trial found no overall composite improvement and possible impairment among those who started out performing best. Neither a universal benefit nor a universal absence of effect is supportable.
Several studies find that non-prescribed users rate their performance as improved when objective measures did not change, or got worse.
Non-medical use is associated with lower, not higher, academic attainment in observational student data — a correlation that is confounded, but not in the direction the marketing story would predict.
Cardiovascular effects are dose-related and real: raised heart rate and blood pressure, with sudden cardiac events reported in people with underlying structural heart disease.

Half-life and how long it lasts

Mixed amphetamine salts, with the instant-release form acting for around four to six hours and the extended-release form roughly ten to twelve. Tolerance to the euphoric and appetite effects develops faster than tolerance to the therapeutic effect in ADHD, which is part of why escalation is a hallmark of misuse rather than of treatment.

Risks

Real dependence potential — this is a Schedule II amphetamine, and tolerance-driven dose escalation is the standard failure mode. Cardiovascular load (heart rate, blood pressure), appetite and sleep destruction, anxiety, and in vulnerable people psychosis at high exposure. Withdrawal is a genuine crash. Combining with other stimulants or MAOIs is dangerous. Counterfeit pills pressed with fentanyl are a documented, recurring cause of death in people who thought they were buying Adderall.

Who should never touch it

Anyone with structural heart disease, arrhythmia, cardiomyopathy or a family history of sudden cardiac death
Anyone taking an MAO inhibitor
Anyone with a history of psychosis, mania or bipolar disorder
Anyone with a history of stimulant or other substance dependence
Anyone with uncontrolled hypertension or hyperthyroidism
Anyone taking it without a diagnosis and a prescriber, which is the entire non-medical case

Interactions worth knowing

MAO inhibitors — a genuinely dangerous combination that can cause a hypertensive crisis, and one of the few absolute drug contraindications in this catalogue.
Other stimulants including caffeine, clenbuterol and decongestants, which stack cardiovascular load.
SSRIs and other serotonergic drugs, where serotonin syndrome is a recognised though uncommon risk.
Alcohol, which masks impairment and adds cardiac strain.
Thyroid hormone and beta-agonists, on the same cardiovascular reasoning.

Stacking interactions

Documented interactions with other things people research. A compound not listed here does not mean the combination is safe — only that no specific interaction is on file.

CautionClenbuterol