  We study the motion of massive particles with electric and magnetic charges
in the background of a magnetically charged Garfinkle-Horowitz-Strominger
stringy black hole. We solve analytically the equations of motion of the test
particles and we describe the orbital motion in terms of the Weierstrass
elliptic functions. We find that there are critical values of the magnetic
charge of the black hole and the magnetic charge of the test particle which
characterize the bound and unbound orbits and we study two observables, the
perihelion shift and the Lense-Thirring effect. The trajectories depend on the
electric and magnetic charges of the test particle. While the angular-motion
depends on the electric charge of the test particle, the $r$ and $t$-motion
depends on the mass and the magnetic charge of the test particle.
