STRATTERA® (atomoxetine HCl) is a selective norepinephrine reuptake inhibitor. Atomoxetine HCl is the R(-) isomer as determined by x-ray diffraction. The chemical designation is (-)-N-Methyl-3-phenyl-3-(o-tolyloxy)-propylamine hydrochloride. The molecular formula is C17H21NO•HCl, which corresponds to a molecular weight of 291.82. The chemical structure is: