Is Alcohol Consumption Safe During Clexane Injections?

Hi,I am in Switzerland and a bit worried about their measures for a Fracture in my Foot, i just wanted to check if you think it is all ok.I have a stress Fracture on my left foot, they put a air boot on it, so it can be removed. They said I need clexane injections everyday in my stomach..is this normal? Also can i drink alcohol on the clexane injections? And can i smoke? They said I might need the injections for 3 weeks, is this a long time to go on it?

Thanks so much, this will really put my mind at rest,