Chemotherapy is the use of drugs to destroy cancer. A cancer patient’s treatment may consist of one drug or a group of drugs that work together (combination therapy). Chemotherapy can be given by mouth or injection directly into the bloodstream. Chemotherapy can be given in the doctor’s office, in the hospital or at home, depending on how you are feeling and what kind(s) of drug(s) you are receiving. Chemotherapy treatments will be given at regular intervals, such as weekly or twice per month for several months. The length and frequency of treatment depends upon the individual and the drug(s) being used.