A biodegradable stent comprising a biodegradable material having dissolved therein an acid scavenging agent. The biodegradable material may be PLLA or PLGA. The acid scavenging agent may be also a pharmaceutical agent, for example an antiproliferative agent, coronary vasodilator agent and/or a bronchodilator. Preferably the acid scavenging agent is dipyridamole and/or mopidamol. The invention also provides a method of preparing a biodegradable material for use in the stent of the invention comprising: (i) preparing a formulation of the biodegradable material and the acid scavenging agent (ii) heating the formulation to melt the biodegradable material and the acid scavenging agent so as to dissolve the agent in the material and (iii) collecting and cooling the formulation of step (ii).
