I have been on for 3 1/2 years. So far no side effects.

1year no side effects. My doctor told me that I would be on for the rest of my life.

I am in year 4

Hello Denise,
Have you visited this page:
https://www.keytruda.com/side-effects/#serious

It lists most of the serious side effects first, then there is a paragraph of common side effects. You should be on the lookout for the serious side effects and let your doctor know if you experience any of them.

Here is another page found at their website for how to stay healthy while on Keytruda:
https://www.keytruda.com/immunotherapy-treatmen...

Hopefully we can stay on it for the duration!

Stay positive!
Tony