Fullerenes may be used for drug delivery systems drug delivery system: The process of giving a drug to a human or animal to achieve a therapeutic effect. in the body, in lubricants lubricant: A substance used to reduce the friction between two solid surfaces. and as catalysts.The tube fullerenes are called nanotubes.ullerenes may be used for drug delivery systems drug delivery system: The process of giving a drug to a human or animal to achieve a therapeutic effect. in the body, in lubricants lubricant: A substance used to reduce the friction between two solid surfaces. and as catalysts.