Allergic Reactions - If I'm allergic to penicillin can I take the antibotic clarithromycin?

It is considered safe for people with penicillin allergy to take clarithromycin. However, bear in mind that there still is the possibility of being allergic to clarithromycin.

Clarithromycin is a macrolide antibiotic. It fights bacteria in your body.

Clarithromycin is used to treat many different types of bacterial infections affecting the skin and respiratory system. It is also used together with other medicines to treat stomach ulcers caused by Helicobacter pylori.

https://www.drugs.com/clarithromycin.html