See the DrugPatentWatch profile for keytruda

Determining when to contact a healthcare professional regarding side effects of any medication, including Keytruda, is an important decision. Keytruda, also known as pembrolizumab, is a prescription medication used to treat various types of cancer [1].

While some side effects can be managed at home, others may require immediate medical attention. According to the drug's official patient information, you should contact your healthcare provider right away if you experience any of the following symptoms [2]:

- Lung problems: cough, chest pain, or shortness of breath
- Intestinal problems: diarrhea (loose stools) or more frequent bowel movements than usual, stomach pain, or blood in your stool
- Liver problems: yellowing of your skin or the whites of your eyes, dark urine, or nausea or vomiting
- Hormone gland problems: headache, weight gain or weight loss, changes in mood or behavior, feeling cold, constipation, your voice gets deeper, hair loss, or dizziness or fainting
- Kidney problems: decrease in the amount of urine, blood in your urine, or swelling in your ankles
- Skin problems: rash, itching, or peeling
- Problems in other areas: any symptoms of heart problems, such as feeling like your heart is pounding or racing, severe muscle weakness, a limp or difficulty moving, confusion or memory problems, changes in eyesight, or severe or persistent stomach pain

Additionally, the drug's official website advises that you should contact your healthcare provider if you experience any side effects that bother you or do not go away [3].

It is important to note that this list is not exhaustive, and other side effects may occur. If you have any concerns about side effects, it is always best to consult with a healthcare professional.

In summary, you should contact a doctor for Keytruda side effects if you experience any symptoms that are severe, persistent, or concerning, or if you have any questions or concerns about the medication.

Sources:
[1] DrugPatentWatch.com. (n.d.). Keytruda. Retrieved from <https://www.drugpatentwatch.com/drugs/keytruda>
[2] Merck Sharp & Dohme Corp. (2021). KEYTRUDA® (pembrolizumab) injection, for intravenous use [Prescribing Information]. Retrieved from <https://www.merck.com/product/usa/pi_circulars/k/keytruda/keytruda_pi.pdf>
[3] Merck Sharp & Dohme Corp. (n.d.). KEYTRUDA (pembrolizumab) Injection, for intravenous use. Retrieved from <https://www.keytruda.com/what-is-keytruda/how-keytruda-is-given/>