Does pepcid affect immune system?

Hi. I started Pepcid and Zyrtec around September and my symptoms got sooooo much better. But I have gotten 3 viruses within the last month. And I rarely ever get sick. Even when I was a teacher I would barely ever get sick. I’m wondering does Pepcid affect your immune system in anyway? Or can possibly make mcas worse by making things in your gut worse?