No, Cilazapril which is a medication used to treat high blood pressure and congestive heart failure does not cause weight gain and the general side effects are:
constipation,cough,decreased,appetite,diarrhea,dizziness,drowsiness,flushing,headache,increased sweating,joint pain,muscle cramps,nausea,pins and needles sensation,runny nose,trouble sleeping,unusual tiredness,vomiting.