Abstract: Embodiments of bridged tetrahydroisoquinolines and methods for their use in selectively inhibiting nicotinamide adenine dinucleotide phosphate (NADPH) oxidase 2 are disclosed. The disclosed compounds have a structure according to general formula I or a pharmaceutically acceptable salt thereof: wherein “” represents a single or double bond, R1 is hydrogen, halogen, lower aliphatic, substituted or unsubstituted aryl, or substituted or unsubstituted heteroaryl; Ra is hydrogen, —CH2R2, R3, or —SO2R4; R2 is lower aliphatic, substituted or unsubstituted aryl, or substituted or unsubstituted heteroaryl; R3 is substituted or unsubstituted aryl, or substituted or unsubstituted heteroaryl; R4 is lower aliphatic, or substituted or unsubstituted aryl; and R5 is hydrogen, halogen, or lower aliphatic.