about 2 years ago - Crater Creator - Direct link
Radiation?

Radiation only does direct damage to your health. There are no long term effects.

I believe there are overhaul mods that have radiation poisoning. If you’re playing one of those instead of ‘vanilla’ 7DtD, let me know and I can move this to the Modding sub-forum, where people may have an answer for you.
about 2 years ago - Crater Creator - Direct link
Each unit of antibiotics works slowly over time to reduce your infection by a limited amount. After you use the antibiotics, if you open the character screen, you should see a “treated infection” buff listed if the antibiotics are working.