Pharmaceutical formulations

A pharmaceutical formulation comprising Compound 1, or a pharmaceutically acceptable salt thereof, mannitol, microcrystalline cellulose, croscarmellose sodium, and magnesium stearate, wherein Compound 1 is 1-{2-[(1R)-1-aminoethyl]-4-chlorobenzyl}-2-thioxo-1,2,3,5-tetrahydro-4H-pyrrolo [3,2-d]pyrimidin-4-one

• wherein Compound 1 is present at about 2.5% w/w, the mannitol is present at about 55% w/w, the microcrystalline cellulose is present at about 36.5% w/w, the croscarmellose sodium is present at about 4% w/w, and the magnesium stearate is present at about 2% w/w, wherein the weight percentages are based on the total weight of the pharmaceutical formulation.