The present invention refers to a tubing set (126) suitable for use in co-operation with a machine (100) for carrying out a hemodialysis treatment of a patient's blood. The tubing set comprises: a blood out-tube (102) for supplying the blood from the patient to a filter (106) of said machine； a blood in-tube (114) for supplying the blood from the filter back to the patient； and a substitution tube (116) connected to one of said blood in-tube or blood out-tube suitable for providing a substitution fluid in the patient's blood. According to the invention, the substitution tube comprises an insert (30) for the infusion of drugs. The invention further refers to the insert and to a vial (34) suitable to co-operate with the insert. The invention finally refers to a method for delivering drugs.
