Stimulation Mechanisms of Caffeine and Adderall

Mechanism of Action

Adderall acts directly on the dopamine transporter in the striatum, causing a significant increase in synaptic dopamine, as reported by the American Academy of Child and Adolescent Psychiatry 2, 3
Adderall inhibits dopamine and norepinephrine transporters, vesicular monoamine transporter 2, and monoamine oxidase activity, according to Pharmacology and Therapeutics 1, 4
Adderall directly stimulates the release of norepinephrine and dopamine from presynaptic terminals, as stated in the Journal of the National Comprehensive Cancer Network 5
Adderall has agonist activity at serotonin type 1A receptors, as noted in Pharmacology and Therapeutics 1, 4

Adderall produces stronger stimulant effects with greater impact on neurotransmitter systems, as reported by Pharmacology and Therapeutics 1
Adderall significantly enhances executive function, working memory, and inhibitory control in the prefrontal cortex, according to the American Academy of Child and Adolescent Psychiatry 2, 3, 6
Adderall occupies a high proportion of dopamine transporter sites in the striatum when given orally, as stated in the Journal of the American Academy of Child and Adolescent Psychiatry 3, 6

Caffeine has a half-life of approximately 5-6 hours in adults, as reported by the Journal of the American Academy of Child and Adolescent Psychiatry 7
Adderall's immediate-release forms act within 30 minutes with effects lasting 3-4 hours, according to the Journal of the American Academy of Child and Adolescent Psychiatry 6, 7
Adderall's plasma half-life ranges from 3 hours to 11 hours, as stated in the Journal of the American Academy of Child and Adolescent Psychiatry 6, 7

Adderall can cause more pronounced side effects, including decreased appetite, significant sleep disturbances, increased blood pressure and heart rate, as reported by Pharmacology and Therapeutics 8, 4
Adderall can cause growth suppression in children with long-term use, according to Pharmacology and Therapeutics 8, 4

Adderall requires medical supervision and prescription due to its potent effects and side effect profile, as noted in Pharmacology and Therapeutics 1
The choice between these stimulants should consider the risk-benefit ratio, with Adderall reserved for diagnosed conditions like ADHD, as reported by Pharmacology and Therapeutics 1, 8