Hell0 My Dog Is Almost Nine Malamute Has Cushings And

Hell0 my dog is almost nine malamute has cushings and torn acl poor thing was on drugs for cushings and did terrible. so we decided to take him off and dr prescribed deramaxx for inflammation and acl pain I have spent a lot. He is on 75 mg seems to be doing better question can I split this pill to make it last for it is expensive
thanks for you help