Huperzine A vs Sabroxy (Oroxylum indicum)

Mechanism

Potent, selective, and reversible inhibitor of acetylcholinesterase (AChE), derived from the club moss Huperzia serrata. Exhibits preference for the tetrameric G4 form of AChE predominant in the mammalian brain. Eight-fold more potent than donepezil and two-fold more potent than rivastigmine at AChE inhibition. Crosses the BBB efficiently. Also antagonizes NMDA receptors at high concentrations and provides neuroprotection via attenuation of oxidative stress, regulation of apoptotic proteins (Bcl-2, Bax, P53, caspase-3), and upregulation of NGF.

Standard Dosing

50-200 mcg twice daily

Timing

Morning and early afternoon. With or without food.

Cycle Duration

Cycle 2-4 weeks on, 1-2 weeks off to prevent AChE downregulation

Side Effects

• Nausea
• Diarrhea
• Sweating
• Blurred vision
• Muscle twitching
• Bradycardia at high doses

Contraindications

• Bradycardia
• Asthma/COPD (cholinergic bronchoconstriction)
• GI obstruction
• Concurrent use of prescription AChE inhibitors
• Peptic ulcer disease

Best Stacking Partners

Mechanism

Contains oroxylin A — a flavonoid that inhibits PDE (phosphodiesterase), increases BDNF, and modulates dopamine signaling. Enhances focus and motivation without stimulant side effects. Also acts as a mild MAO-B inhibitor, preserving dopamine levels.

Contraindications

• Concurrent MAO inhibitors