Medication Guides

What Happens If You Take Antibiotics Without an Infection?

Linda Girgis | MD

Medically reviewed by Linda Girgis | MD, Girgis Family Medicine on August 21st, 2026.

Taking antibiotics without an infection can cause harmful side effects and contribute to antibiotic resistance. When you take antibiotics unnecessarily, they kill beneficial bacteria in your gut microbiome, which can lead to digestive issues, yeast infections, and increased susceptibility to harmful bacteria like C. difficile. Studies show that inappropriate antibiotic use accounts for 30-50% of all antibiotic prescriptions in outpatient settings. This misuse also promotes the development of antibiotic-resistant bacteria, making future infections harder to treat. Additionally, you may experience side effects like nausea, diarrhea, and allergic reactions without any therapeutic benefit.

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