Is chemotherapy only given through an IV?

No. An IV is the most common route, but the National Cancer Institute lists seven ways chemotherapy can be given, and several never involve a vein.

The seven routes NCI names

• Oral: pills, capsules, or liquids that are swallowed.
• Intravenous (IV): directly into a vein.
• Injection: a shot into a muscle in the arm, thigh, or hip, or just under the skin in the fatty part of the arm, leg, or belly.
• Intrathecal: injected into the space between the layers of tissue covering the brain and spinal cord.
• Intraperitoneal (IP): into the peritoneal cavity, the area holding organs such as the intestines, stomach, and liver.
• Intra-arterial (IA): into the artery that leads to the cancer.
• Topical: a cream rubbed onto the skin.

The last four are worth pausing on. They exist because some cancers sit in places that drugs in the bloodstream reach poorly, or because concentrating a drug in one compartment spares the rest of the body.

Oral chemotherapy deserves its own note. It is chemotherapy, with the same handling precautions and the same need to take it exactly on schedule. Taking a cancer drug at the kitchen table can make it feel like an ordinary prescription. It is not one.

Even an IV is not one thing

NCI describes four ways the drug can enter a vein.

The simplest is a thin needle placed in a vein on the hand or lower arm. The nurse inserts it at the start of each treatment and removes it at the end.

A catheter is a thin, soft tube. One end sits in a large vein, often in the chest, and the other end stays outside the body. Most stay in place until treatment finishes, and they can also be used for other drugs and for drawing blood.

A port is a small round disc placed under the skin in a minor operation. A catheter connects it to a large vein, usually in the chest. A nurse puts a needle into the port to give the drug or draw blood, and the needle can stay in place for treatments running longer than a day.

A pump attaches to a catheter or port and controls how much drug goes in and how fast. That is what allows some chemotherapy to run outside the hospital. Pumps can be external, staying outside the body, or internal, placed under the skin during surgery.

NCI attaches the same warning to both catheters and ports: watch for signs of infection around the site. Redness, swelling, pain, warmth, or drainage where the device enters the body means calling the treatment team the same day. A fever of 100.4 °F (38 °C) or higher is a step above that. CDC, which publishes that threshold, calls a fever during chemotherapy a medical emergency, so reach your treatment team straight away, whatever the hour, instead of waiting for the clinic to ring back. If they cannot be reached quickly, go to an emergency department and say at the desk that you are having chemotherapy.

What decides the route

NCI says the choice of drug depends mostly on the type of cancer and how advanced it is, whether there has been chemotherapy before, and whether other conditions such as diabetes or heart disease are present. The route follows the drug.

The setting varies too. Chemotherapy may be given during a hospital stay, at home, or as an outpatient in a doctor's office, clinic, or hospital.

Most schedules run in cycles: a period of treatment followed by a period of rest. NCI's example is chemotherapy every day for one week, then three weeks off, with those four weeks making one cycle. The rest period lets the body recover and build new healthy cells.

One correction worth carrying: NCI says side effects do not indicate whether chemotherapy is working. That is judged by exams, blood tests, and scans. Our guide to how chemotherapy is given covers each route in more detail, and our chemotherapy page covers what to settle first.

NCI's chemotherapy page was last updated on May 15, 2025.

Sources

• https://www.cancer.gov/about-cancer/treatment/types/chemotherapy
• https://www.cdc.gov/cancer-preventing-infections/patients/fever.html