(1R,9S)-(–)-β-Hydrastine is an enantiomer of the alkaloid hydrastine that inhibits dopamine biosynthesis (IC50 = 20.7 μM in PC12 cells) by inhibiting tyrosine hydroxylase activity. It inhibits dopamine release with an IC50 value of 66.5 μM in the presence of high extracellular K+ levels. It also inhibits L-type and caffeine-activated store-operated Ca2+ channels and prevents Ca2+ leakage from intracellular stores.
