If you DON'T you will regret it !! Those on long term antibiotic therapy NEED to be replacing the good bacteria in their gut. Otherwise, the bad bacteria will take over and you will be miserable. Take the antibiotics two hours away from taking the probiotics. I would suggest purchasing a high quality probiotic like Theralac Probiotics
or VSL#3. You are also at some risk for c. diff and that can be dangerous. You would need Florastor for that. For now, I would stick with a high quality probiotic.