Dexedrine

Pure d-amphetamine — same active drug as Vyvanse but without prodrug protection, slightly cleaner peripheral profile than Adderall (no L-isomer cardiovascular load). For 20yo Dylan with no diagnosis: SKIP-FOR-NOW. Same brain-dev / age reasoning that rules out other amphetamines applies here. STRONG-CANDIDATE only if a clinical narcolepsy or ADHD diagnosis is established and a prescriber recommends a classical stim.

Dextroamphetamine is the (S)-(+)-enantiomer of amphetamine — the more potent CNS-active half. Pure d-amphetamine, no levoamphetamine. This is what makes Dexedrine pharmacologically distinct from Adderall (3:1 mixed d:l salts) and downstream-identical to Vyvanse (which is a lysine-bonded prodrug that the body cleaves into d-amphetamine).

Triple action — how amphetamines actually move dopamine:

1. TAAR1 agonism (intracellular). Amphetamine enters monoamine neurons via DAT/NET. Inside, it activates trace amine-associated receptor 1 (TAAR1), which triggers PKA/PKC phosphorylation of DAT → DAT internalizes off the membrane AND reverses its transport direction. Dextroamphetamine is a 3-4× more potent TAAR1 agonist than levoamphetamine, which is the molecular reason d-amphetamine produces more CNS stimulation per mg.
2. VMAT2 inhibition + cytoplasmic flooding. Amphetamine displaces dopamine, NE, and serotonin from synaptic vesicles into the cytoplasm. Cytoplasmic monoamine concentrations spike.
3. Reverse transport (efflux). With DAT/NET now running in reverse, the cytoplasmic monoamine pool floods out into the synapse — the opposite of how transporters normally work. This is "forced release," distinct from reuptake inhibition (cocaine, methylphenidate) or eugeroic mechanisms (modafinil).

Mild MAO inhibition at high doses adds further amplification.

Why "cleaner than Adderall" is mechanistically real, not just marketing:

• Levoamphetamine (the 25% in Adderall that's NOT in Dexedrine) is the weaker CNS agent but the stronger peripheral sympathomimetic. L-amphetamine has slightly higher cardiovascular and smooth-muscle effects per mg.
• Strip out the L-isomer → fewer peripheral effects (jitters, jaw tension, vasoconstriction, BP spike) per unit of central dopamine release. This is the mechanism behind anecdotal reports that Dexedrine "feels cleaner" or "less anxious" than Adderall.
• The effect is real but modest — both drugs still hit cardiovascular system meaningfully, both still carry the FDA black-box for sudden cardiac death.

vs Vyvanse: Same active drug post-metabolism, different release kinetics. Vyvanse must be cleaved by GI peptidases (lysine bond) before any d-amphetamine appears in plasma → slow ramp, no IV/snort potential, lower abuse liability. Dexedrine IR delivers d-amphetamine directly → fast onset, higher peak, more euphoric, more abusable.