Many of us grew up believing they were harmless.

In fact, they’re still handed out like candy.

But today, scientists are discovering that some antibiotics can cause far more damage than the illness they’re supposed to treat.

And a shocking new study found doctors are still prescribing these drugs almost automatically—a staggering 96% of the time, even when research shows patients DON’T need them.

Worse yet…

Nearly half of those prescriptions belonged to a drug family linked to tendon ruptures, nerve damage, blindness, suicide, and even deadly damage to the heart’s largest artery.

Keep reading to see exactly what class of antibiotics you and your loved ones should avoid.

Researchers recently reviewed more than 33,000 cases of uncomplicated diverticulitis treated at 120 Veterans Affairs medical centers.

These were not the sickest patients.

In fact, only about 12% of diverticulitis cases become complicated. The overwhelming majority are mild enough that modern guidelines say many patients can safely recover without antibiotics.

That recommendation isn’t based on opinion.

It’s based on four randomized clinical trials showing that carefully selected patients do just as well without them.

Yet the new study found something astonishing.

96.6% of patients still walked away with an antibiotic prescription.

Even more concerning…nearly 46% received a fluoroquinolone antibiotic—the family of drugs ending in “-flox,” such as ciprofloxacin.

If that sounds familiar, it should.

Earlier this year, I told you these drugs have been linked to a 56% higher risk of aortic aneurysm and dissection, potentially life-threatening tears in the body’s largest artery.

But that’s only part of the story.

Fluoroquinolones have also been associated with tendon ruptures, permanent nerve damage, psychiatric reactions—including depression and suicidal thoughts—and even an increased risk of glaucoma and other vision problems.

Meanwhile, any unnecessary antibiotic comes with another hidden cost.

It disrupts your gut microbiome—the trillions of beneficial bacteria that help regulate digestion, immunity, metabolism, and even brain health.

Scientists now believe repeated, unnecessary antibiotic exposure may contribute to everything from recurrent infections to chronic digestive problems.

Now, to be clear…

If diverticulitis is severe, accompanied by signs of widespread infection, or occurs in someone who is frail or immunocompromised, antibiotics remain an essential part of treatment.

The problem is that too many people are still receiving them by default—not because the evidence supports it, but because old prescribing habits are hard to break.

So if you’re ever prescribed antibiotics—don’t be afraid to ask one simple question:

“Do current guidelines say I really need this antibiotic?”

That conversation could protect more than your gut.

It could protect your tendons…

Your eyesight…

And perhaps even your life.

To asking better questions,

Ray Thatcher
Research Director, Health Sciences Institute

Sources:

Sutton, J. D., Westanmo, A. D., Gravely, A. A., et al. (2026). Outpatient antibiotic prescribing for uncomplicated diverticulitis in Veterans Affairs facilities: A retrospective cohort study. Annals of Internal Medicine. Advance online publication. https://doi.org/10.7326/ANNALS-25-05583

H.-T. Chau and N. P. B. Au, “Fluoroquinolone-Associated Psychiatric and Ocular Adverse Events: A Disproportionality Analysis Using Real-World Data From FAERS (2011–2024),” Pharmacology Research & Perspectives14, no. 1 (2026): e70206, https://doi.org/10.1002/prp2.70206.


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