Comparison
Modafinil vs Synephrine (Bitter Orange)
Modafinil
A eugeroic — a wakefulness-promoting compound — originally developed for narcolepsy. The most-studied prescription cognitive enhancer outside of ADHD treatment. Produces 12–15 hour windows of sustained alertness without the euphoria, abuse potential, or cardiovascular load of amphetamines. Prescription-only in nearly every jurisdiction.
Synephrine (Bitter Orange)
Citrus aurantium alkaloid. Alternative to ephedrine for fat loss. Cardiovascular load is real; effective dose narrow.
| Field | Modafinil | Synephrine (Bitter Orange) |
|---|---|---|
| Category | stimulant | stimulant |
| Dose range | 100–200mg | 25–100mg |
| Half-life | 14h | — |
| Onset | 45min | — |
| Evidence | EVIDENCEA | EVIDENCEB |
| Safety | ●●●○○ | ●●●○○ |
| Legal (US) | USSchedule IV | USOTC |
| PubMed refs | 3200 | 320 |
The comparison in plain English
Auto-generated from dataModafinil and Synephrine (Bitter Orange) are both in the stimulant category respectively. Modafinil A eugeroic — a wakefulness-promoting compound — originally developed for narcolepsy. Synephrine (Bitter Orange) Citrus aurantium alkaloid.
Bottom line
Modafinil (evidence A, safety 3/5) has a weaker evidence base than Synephrine (Bitter Orange) (evidence B, safety 3/5). Modafinil has the slightly cleaner safety profile. For users new to either, the higher-evidence option is the safer first try.
Choose Modafinil if
Modafinil is the better fit when your goal aligns with its mechanism (Inhibits dopamine reuptake via the dopamine transporter (DAT), increasing extracellular dopamine in the prefrontal cortex) and the dose range (100–200mg) suits your protocol. Half-life is 14h.
Choose Synephrine (Bitter Orange) if
Synephrine (Bitter Orange) is the better fit when your goal aligns with its mechanism (Selective beta-3 adrenergic agonist with some beta-1 and beta-2 activity) and the dose range (25–100mg) suits your protocol. Half-life is —h.