I’ve Been Taking Antibiotics For 3 Days To Treat H.

I’ve been taking antibiotics for 3 days to treat H. Pylori and I’m feeling some itching and irritation around my lips that seems to be an allergic reaction and it feels like it’s getting worse. I need to take the antibiotics for another 7 days. Can I take piriton or will it interfere with the antibiotics? I’m also taking Amlodipine for my hypertension.