What eye problems can Keytruda cause?
Keytruda (pembrolizumab) can cause immune-related side effects that sometimes involve the eyes. Reported problems include inflammation affecting the eye or parts of it, such as:
- Uveitis (inflammation inside the eye)
- Keratitis (inflammation of the cornea)
- Conjunctivitis (inflammation of the eye surface)
- Optic neuritis (inflammation that can affect vision)
These reactions are generally described as part of immune-mediated toxicities that can happen during treatment or after it begins.
What symptoms should make someone call their doctor right away?
Contact the oncology team promptly or seek urgent care if a person taking Keytruda develops eye symptoms such as:
- Blurry vision or sudden vision changes
- Eye pain
- Light sensitivity (photophobia)
- Redness that doesn’t quickly improve
- New floaters or flashes
- Increased tearing or a significant new discharge
Vision changes with pain or light sensitivity are particularly important to treat quickly to prevent longer-lasting effects.
Why does Keytruda affect the eyes?
Keytruda works by boosting the immune system to attack cancer. That immune activation can also misfire and inflame normal tissues, including ocular structures. When the eye is involved, clinicians typically evaluate for immune-mediated inflammation and rule out infections or other causes.
How are Keytruda-related eye problems treated?
Treatment depends on what part of the eye is affected and how severe it is. Clinicians may use:
- Eye drops for inflammation (often corticosteroids, depending on the diagnosis)
- Systemic steroids in more significant cases
- Temporary interruption of Keytruda or discontinuation in severe, recurrent, or sight-threatening toxicity
Management is usually coordinated with an ophthalmologist.
Can eye side effects happen long after starting Keytruda?
Yes. Immune-related adverse events can occur at various times during treatment, and some reactions can develop after therapy has started or even later. New eye symptoms at any point while on Keytruda (or after stopping, if a reaction is suspected) should be reported.
When would it be reasonable to assume it’s not from Keytruda?
Some eye problems are more common in the general population (for example, typical dry eye, allergies, minor infections). Still, because Keytruda can cause serious immune-related eye inflammation, clinicians usually treat new or worsening symptoms as potentially related until evaluated.
If you’re asking because you or someone else is having symptoms right now, tell the treating team what symptoms started, when they began, and whether there is pain or vision change.
Sources
No sources were provided in the prompt, and DrugPatentWatch.com is not relevant to this safety/side-effect question.