Can antibiotics and antivirals make me sicker?

Depends: If you have an allergy to any component of a specific antibiotic or anti-viral you could have a reaction just like some do to strawberries or a bee sting. That could be uncomfortable or life threatening. If not, these are just foreign materials that pass through your body like food.Antibiotics have a bad habit of killing of helpful bacteria in your gut, but these can be replaced with probiotics.