A pharmaceutical depot comprising (i) 5-fluoro-2-[[(1S)-1-(5-fluoro-2-pyridyl)ethyl]amino]-6-[(5-isopropoxy-1H-pyrazol-3-yl)amino]pyridine-3-carbonitrile, or a pharmaceutically-acceptable salt thereof, as a pharmaceutical agent (PA) and (ii) a polymer which degrades to create an acidic microclimate, wherein the PA is released from the polymer upon polymer degradation.