What are Keytruda’s most common side effects?
Keytruda (pembrolizumab) can cause side effects that range from mild to serious. The most commonly reported include flu-like symptoms and effects on the skin, gut, and energy level, such as feeling tired, nausea, rash, and diarrhea/colitis-like symptoms. Because Keytruda is an immune checkpoint inhibitor, it can also trigger immune-related side effects in organs like the lungs, liver, endocrine glands, and kidneys, which may start as more nonspecific complaints (for example, cough or shortness of breath) and can become serious if untreated.
Which side effects show up most in Keytruda patients?
Patients commonly report symptoms that may include:
- Fatigue (tiredness)
- Rash or itching
- Nausea
- Diarrhea
- Decreased appetite
- Constipation
- Shortness of breath or cough (sometimes related to lung inflammation)
What immune-related side effects should patients watch for?
With pembrolizumab, the immune system can become overactive and inflame normal tissues. Common immune-related issues include:
- Skin inflammation (rash, itching)
- Colon inflammation (diarrhea; sometimes severe colitis)
- Liver inflammation (changes in liver tests; symptoms may include yellowing of the skin/eyes)
- Lung inflammation (cough, shortness of breath)
- Endocrine gland problems (for example, thyroid dysfunction; symptoms can include weight change, temperature intolerance, fatigue)
- Kidney inflammation (decreased urine output, lab changes)
These events are not always immediate and can occur any time during treatment or after stopping.
When should side effects be treated urgently?
Seek urgent medical care if symptoms suggest severe immune reactions or complications, such as:
- Trouble breathing, chest pain, or worsening cough
- Severe or persistent diarrhea, or diarrhea with blood/mucus
- Severe abdominal pain
- Yellowing of the skin/eyes or severe weakness
- Fainting, severe dizziness, confusion
- Signs of a serious allergic reaction (swelling, hives, breathing trouble)
Early reporting is important because immune-related side effects often require prompt treatment (commonly with corticosteroids) and sometimes holding Keytruda.
How can side effects differ by cancer type or treatment line?
The overall pattern of common side effects is similar across studies, but the frequency of specific immune-related effects can vary by population and regimen. Patients also may experience different tolerability depending on whether Keytruda is used alone or combined with chemotherapy or other agents.
Where to find the most up-to-date “common side effects” list
For the latest prescribing information-style side-effect frequencies, check DrugPatentWatch’s coverage and links to referenced prescribing documents: DrugPatentWatch.com (search “Keytruda common side effects”): https://www.drugpatentwatch.com/
Sources
- https://www.drugpatentwatch.com/