Sydnocarb
Sydnocarb (mesocarb) is a sydnone-imine psychostimulant developed in the Soviet Union as a milder, longer-acting amphetamine alternative. It has some historical Russian clinical use for asthenia and ADHD-like indications, but little Western data; grey-market interest treats it as a gentler stimulant.
01 Overview
Sydnocarb is a prodrug-like sydnone imine that liberates an amphetamine-related active moiety slowly, giving a smoother, less euphoric profile than d-amphetamine with reported lower cardiovascular load. It was used clinically in the USSR/Russia for asthenic and depressive states.
It is not approved in the US or EU, and Western clinical evidence is sparse; most pharmacology derives from older Russian literature. It is essentially a grey-market/legacy stimulant outside the former Soviet sphere.
02 Mechanism
Sydnone-imine that acts as an indirect dopaminergic agonist, releasing dopamine gradually (with some noradrenergic activity), producing amphetamine-like but slower-onset stimulation.
03 Dosing
| Tier | Dose | Route | Notes |
|---|---|---|---|
| Historical low | 5–10 mg/day | Oral | Russian clinical starting range, morning dosing. |
| Historical common | 10–50 mg/day | Oral | Divided doses; higher end for asthenic states. |
04 Effects
| Effect | Magnitude | Evidence | |
|---|---|---|---|
| Stimulation / anti-fatigueImproved energy, mood and vigilance reported in older Russian clinical use. | n/a | Observational | |
| Smoother onsetReported gentler, less jittery stimulation than amphetamine. | n/a | Anecdotal |
05 Side effects
| Effect | Severity | Frequency | Evidence | Countermeasures |
|---|---|---|---|---|
| Anxiety / agitationIrritability, anxiety and restlessness at higher doses. | Moderate | Common | Observational | |
| InsomniaSleep disruption with late dosing. | Mild | Common | Observational | |
| Blood pressure elevationRaised blood pressure, though reportedly milder than amphetamine. | Moderate | Uncommon | Observational |