What is Keytruda (pembrolizumab)?
Keytruda (pembrolizumab) is a prescription treatment that helps the immune system fight certain types of cancer.
It belongs to a group of treatments called immunotherapies, which work by boosting the body’s defense system rather than directly targeting cancer cells. Keytruda blocks a protein called PD-1, which cancer cells use to hide from the immune system.
Here are some of the FDA-approved types of cancer conditions for Keytruda to treat:
- Melanoma: a serious type of skin cancer that can spread to other parts of the body
- Non-small cell lung cancer (NSCLC): the most common form of lung cancer
- Malignant pleural mesothelioma (MPM): cancer of the lining of the lungs and chest wall
- Head and neck squamous cell cancer (HNSCC): cancer in the mouth, throat, or voice box
- Classical Hodgkin lymphoma (cHL): a cancer of the lymph system
- Primary mediastinal B-cell lymphoma (PMBCL): a rare lymphoma in the chest
- Urothelial cancer: bladder and urinary tract cancer
- Colorectal cancer (MSI-H or dMMR): cancer of the colon or rectum with specific genetic changes
- Gastric or gastroesophageal junction (GEJ) cancer: stomach or stomach–esophagus junction cancer
- Esophageal cancer: cancer of the food pipe (esophagus)
- Cervical cancer: cancer of the cervix in women
- Hepatocellular carcinoma (HCC): the most common type of liver cancer
- Biliary tract cancer (BTC): cancer of the bile ducts or gallbladder
- Merkel cell carcinoma (MCC): a rare and aggressive type of skin cancer
- Renal cell carcinoma (RCC): kidney cancer
- Endometrial carcinoma: cancer of the lining of the uterus (womb)
- Tumor mutational burden-high (TMB-H) cancers: solid tumors with many DNA changes, more likely to respond to immunotherapy
- Cutaneous squamous cell carcinoma (cSCC): a common type of skin cancer that can spread
- Triple-negative breast cancer (TNBC): a type of breast cancer that is harder to treat and more aggressive
As for Keytruda dosage and administration, the treatment is usually given as an intravenous infusion into a vein.
The dose schedule depends on the type of cancer, whether it is used alone or in combination with chemotherapy, and the individual treatment plan recommended by the doctor.
Treatment is generally given every three to six weeks. Your doctor will monitor your response and adjust the plan as needed.
Some patients may hear about Keytruda’s off-label use. Off-label use means a treatment is prescribed for a condition that the FDA has not officially approved.
This decision is made by doctors when they believe the potential benefits outweigh the risks, based on research and patient needs.
Keytruda is not suitable for everyone. People with immune system problems, prior organ transplants, or certain autoimmune diseases may face higher risks.
Indications and Benefits of Keytruda
Keytruda (pembrolizumab) is a prescription medication given through an IV infusion. It is an immunotherapy that works by helping your immune system detect and fight cancer cells.
Doctors prescribe it for different cancers, and in some cases, it may also be used for Keytruda off-label use. Keytruda indications and benefits can help patients and caregivers learn how it may fit into a treatment plan.
What Are the Benefits of Keytruda?
- Keytruda helps treat advanced non-small cell lung cancer by supporting the immune system in slowing down or controlling the growth of cancer cells.
- It is used for high-risk non-muscle invasive bladder cancer when other treatments do not work, giving patients another treatment option.
- Keytruda is approved for advanced MSI-H or dMMR colorectal cancer, helping patients whose cancer has specific genetic changes.
- It can help patients with advanced triple-negative breast cancer by improving outcomes where fewer treatment options are available.
- Keytruda works for advanced cervical cancer by slowing cancer growth and supporting the immune response.
- It is also used for advanced liver cancer, offering patients a way to extend survival and improve quality of life.
- Keytruda treats cutaneous squamous cell carcinoma when it cannot be removed by surgery or treated with radiation.
- Doctors use Keytruda for melanoma that has spread or cannot be removed, giving patients more time and better chances of controlling the disease.
- It is given for advanced urothelial bladder cancer to slow down the progression of the disease.
- Keytruda is approved for microsatellite instability-high colorectal cancer, helping patients with tumors that have unique genetic features.
- It is prescribed for classical Hodgkin lymphoma when other treatments fail, offering a new line of defense.
- Keytruda treats advanced MSI-H or dMMR endometrial cancer by targeting cancers with specific genetic differences.
- It helps patients with advanced Merkel cell carcinoma, a rare but aggressive skin cancer.
- Doctors prescribe it for head and neck squamous cell carcinoma, supporting the body in fighting this type of cancer.
- Keytruda can be used for kidney cancer as part of a treatment plan that strengthens the immune response.
- It helps patients with high-risk early-stage triple-negative breast cancer by reducing the chance of cancer returning.
- Keytruda is used for advanced gastric cancer to improve survival outcomes.
- It treats primary mediastinal B cell lymphoma when other therapies have not worked.
- Keytruda works for advanced esophageal cancer by slowing down tumor growth and extending patient survival.
In addition to these approved Keytruda indications, doctors may sometimes consider Keytruda off-label use for other cancers when research supports its benefits.
How It Works
Keytruda works by helping the immune system fight cancer more effectively. Cancer cells can trick the immune system by using proteins called PD-L1 and PD-L2.
These proteins attach to a receptor on immune cells called PD-1, which acts like a brake and slows down the immune response.
Pembrolizumab is a type of targeted therapy called a monoclonal antibody. It attaches to the PD-1 receptor and blocks PD-L1 and PD-L2 from connecting.
By doing this, it releases the brake and allows T cells (a type of white blood cell that fights infections and cancer) to attack the tumor. Studies in animal models show that blocking PD-1 can slow down or reduce tumor growth.
When used together with another drug called lenvatinib, pembrolizumab can further boost immune activity and lower the number of tumor-supporting cells, leading to stronger cancer-fighting effects.
Dosage
Keytruda dosage and administration depend on the type of cancer, patient age, and whether it is used alone or in combination with other treatments.
Doctors usually give Keytruda as an intravenous (IV) infusion over 30 minutes. Follow the recommended Keytruda dosing frequency for the best results.
What Dosage Strengths Does Keytruda Come In?
- Injection (100 mg/4 mL vial)
- Concentration (25 mg/mL solution)
Dosage Chart
| Patient Group / Indication | Recommended Dosage | Keytruda Dosing Frequency | Duration of Treatment | Notes on Keytruda Dosage and Administration |
| Adults with advanced cancers (melanoma, NSCLC, HNSCC, cHL, urothelial, MSI-H/dMMR cancers, esophageal, cervical, HCC, MCC, cSCC, TMB-H) | 200 mg IV OR 400 mg IV | Every 3 weeks (200 mg) OR every 6 weeks (400 mg) | Until disease progression, unacceptable toxicity, or up to 24 months | Infused for over 30 minutes |
| Adults receiving adjuvant therapy (melanoma, NSCLC, RCC) | 200 mg IV OR 400 mg IV | Every 3 weeks OR every 6 weeks | Up to 12 months or until recurrence/unacceptable toxicity | Used after surgery in some cases |
| Adults with high-risk NMIBC not responding to BCG | 200 mg IV OR 400 mg IV | Every 3 weeks OR every 6 weeks | Until persistent or recurrent disease, up to 24 months | For patients not responding to BCG therapy |
| Pediatric patients (cHL, PMBCL, MSI-H/dMMR, MCC, TMB-H) | 2 mg/kg (max 200 mg) | Every 3 weeks | Until disease progression, up to 24 months | Weight-based dosing |
| Pediatric patients > 12 years (adjuvant melanoma) | 2 mg/kg (max 200 mg) | Every 3 weeks | Up to 12 months | Given after surgery |
| Adults in combination therapy (NSCLC, gastric, esophageal, urothelial, RCC, endometrial, TNBC) | 200 mg IV OR 400 mg IV | Every 3 weeks OR every 6 weeks | Until disease progression or up to 24 months | Given before chemotherapy or with targeted oral drugs (lenvatinib, axitinib, etc.) |
Usage Guide
Keytruda is given through an intravenous (IV) line under the supervision of your doctor.
Following the correct steps ensures safe and effective treatment. Your provider will guide you on the right dose and schedule based on your condition.
How do you take Keytruda?
- Schedule your Keytruda treatment with your medical practitioner and confirm the date and time of your appointment.
- Arrive at the clinic and let your provider check your overall health and review any recent blood test results.
- Your provider will prepare Keytruda for intravenous administration, ensuring the correct Keytruda dosing frequency for your condition.
- Keytruda is given into your vein through an IV line. The infusion usually takes about 30 minutes.
- After the infusion, your medical practitioner will monitor you for any immediate side effects or reactions.
- Keep track of your treatment schedule. Adults usually receive Keytruda every 3 weeks or every 6 weeks, depending on the dose, while children usually receive it every 3 weeks.
- Attend all follow-up appointments to monitor progress and check for side effects.
- If you miss an appointment, call your doctor as soon as possible to reschedule and maintain your Keytruda dosage and administration schedule.
Side Effects
Keytruda can cause side effects in some people. Knowing what to expect helps you manage your treatment and talk to your healthcare provider about any issues.
Common side effects of Keytruda:
- Feeling tired or weak
- Pain in muscles, bones, or joints
- Rash or skin irritation
- Diarrhea
- Fever
- Cough
- Decreased appetite
- Itching
- Shortness of breath
- Constipation
- Stomach-area pain (abdominal pain)
- Nausea
- Low levels of thyroid hormone
- Vomiting (more common in children)
- Headache (more common in children)
- Low white blood cell count (more common in children)
- Hair loss
- Trouble sleeping
- Mouth sores
- Hoarseness
- Tingling or numbness in the arms or legs
- Weight loss
- Protein in urine
Severe side effects of Keytruda
- Severe immune reactions affecting the lungs, liver, intestines, or kidneys
- Pneumonitis (inflammation of the lungs, causing breathing problems)
- Colitis (severe inflammation of the intestines)
- Hepatitis (severe liver inflammation)
- Endocrinopathies (serious hormone gland problems)
- Nephritis with kidney dysfunction
- Severe skin reactions, including blistering or rash on palms and soles
- Myocarditis (inflammation of the heart)
- Neurological problems, including weakness or paralysis
- Life-threatening infusion reactions
Missed Dose
If you miss a scheduled Keytruda infusion, contact your doctor as soon as possible. They will guide you on when to reschedule your treatment. Do not try to adjust the dose on your own. Staying on the recommended Keytruda dosing frequency is important for the treatment to work effectively.
Overdose
An overdose of Keytruda is rare, but it can happen. In a medical setting, healthcare professionals will treat an overdose immediately to manage any side effects. Always follow your prescribed Keytruda dosage and administration to avoid taking too much.
Warnings
- Tell your doctor about all the medications you take, including prescription and nonprescription medications.
- Inform your doctor about any allergies you have.
- Share your full health history and current medical problems with your doctor.
- Discuss your pregnancy or breastfeeding status before starting Keytruda.
- Severe immune system problems can occur with Keytruda, including:
- Lung problems (pneumonitis) – swelling or inflammation in the lungs that can cause cough, shortness of breath, or chest pain.
- Intestinal problems (colitis) – inflammation of the intestines that may cause diarrhea, stomach pain, or blood in stool.
- Liver problems (hepatitis) – inflammation of the liver that may cause yellowing of the skin or eyes, dark urine, or stomach pain.
- Hormone gland problems (endocrinopathies) – issues with glands like the thyroid or adrenal glands that can lead to fatigue, weight changes, mood changes, or irregular heartbeat.
- Kidney problems (nephritis with kidney impairment) – kidney inflammation that may reduce urine output, cause swelling, or change electrolyte levels.
- Skin problems (dermatological reactions) – rashes, itching, or painful blisters on the skin or inside the mouth, nose, throat, or genital area.
- Infusion-related reactions, such as severe allergic reactions (hypersensitivity or anaphylaxis), can happen during Keytruda treatment and may cause chills, dizziness, rash, or breathing problems.
- Patients who have had a stem cell transplant using donor cells (allogeneic HSCT) may experience serious complications such as graft-versus-host disease, where the new immune cells attack the body.
- Keytruda should not be used with thalidomide analogues and dexamethasone in patients with multiple myeloma unless part of a clinical trial.
- Women of childbearing age should use effective birth control while receiving Keytruda and for four months after the last dose.
Boxed Warning and Precautions for Keytruda
| Keytruda can boost the immune system to attack cancer, but it may also attack normal organs and tissues. These immune-related problems can be severe, life-threatening, or even fatal. Problems can happen in the lungs, intestines, liver, hormone glands, kidneys, skin, or other organs. Infusion reactions and transplant rejection are also possible. Your doctor will monitor you carefully during treatment and may delay or stop Keytruda if severe side effects occur. Getting medical attention early can help prevent complications from becoming serious. |
Contraindications
Keytruda has no known contraindications. This means there are no specific conditions or situations in which Keytruda should not be used. However, it is important to tell your doctor about your full health history, current medical problems, medications, and any allergies before starting treatment to ensure safe use.
Interactions
Keytruda is not known to have drug interactions. However, this does not mean that interactions cannot be discovered in the future.
New drugs may be developed that could interact with Keytruda. It is important to always tell your doctor and pharmacist about all prescription drugs, over-the-counter products, and supplements you are taking before starting Keytruda.
Sharing this information helps prevent possible Keytruda drug interactions and ensures your treatment is safe.
Storage Information
Store Keytruda vials in the refrigerator at two to eight degrees Celsius, thirty-six to forty-six degrees Fahrenheit.
Keep the vials in their original carton to protect them from light. Do not freeze Keytruda and do not shake the vials. Proper storage helps maintain the effectiveness and safety of Keytruda.
Alternatives
If you are considering a Keytruda alternative, several options may be available depending on your type of cancer and treatment plan.
Discuss with your doctor to find the best choice. Here are some commonly used alternatives to Keytruda:
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Frequently Asked Questions
Disclaimer
Pharma Giant provides medical information to help you better understand medications and medical conditions.This content is for informational use only and does not replace advice from a licensed medical practitioner. Consult your doctor or pharmacist before starting or changing any medication. All our partners follow strict safety standards set by their country’s health authorities to make sure you receive safe and high-quality medications.
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