Polypharmacy in the elderly

Polypharmacy in the Elderly: What Nine Bottles Hide From Your Numbers

Polypharmacy in elderly adults is a long daily medication list, and its quieter risk is that prescriptions get renewed for years with nobody rechecking the measurement behind them. Measuring before the medication review is what shows whether each one is still needed.

Every bottle in a long medication list was started to move a number. Years later, few people can say whether that number still needs moving.

In one national analysis, 39.0% of Americans over 65 took at least five prescription medicines every day. Polypharmacy in elderly adults is usually discussed as a question of drug interactions. The quieter problem is that each bottle was started because of a measurement, and most are renewed for years without anyone checking whether that measurement still says the same thing.

In the video Two-Thirds of Your Pill Is Not the Drug, Dr. Gurpreet Singh Padda, MD, MBA, MHP, coauthor of The Angry Gut with Ami Michelle Grimes, follows a sixty-eight-year-old man who carried nine bottles to his appointment in a plastic bag. Measura [Cardiometabolic and Autonomic Health Analysis] is a testing service: it measures, and your physician decides. What follows is the measurement side of his story.

Why is polypharmacy in elderly adults a problem?

His list was ordinary. A statin, a blood pressure pill, metformin, an acid blocker renewed for eleven years, a daily anti-inflammatory for his knees, low-dose aspirin, an antidepressant, a laxative and a multivitamin. Alongside them he had bloating, stools that alternated between loose and absent, and a tiredness his cardiologist credited to age.

Every one of those prescriptions could be defended when it was written. The trouble is structural. Each belongs to a different office, and a routine visit checks names and doses, not the combined effect of the bag on the person carrying it. No single clinician owns the whole list, so in practice nobody does. That is the social half of the problem, and it is why a number matters more than another conversation.

What do the inactive ingredients in pills do to your gut?

Dr. Padda admits he spent most of his career assuming the inactive part of a label was inert. The measurements changed his mind. Among the most prescribed oral medicines in the United States, the typical tablet or capsule holds 280 mg of inactive ingredient against 164 mg of drug, spread across 8.8 separate inactive ingredients. Someone on 10 prescriptions swallows roughly 2.8 g of that material each day.

The contents matter more than the weight. Lactose is present in 45% of oral solid medicines, and 55% of oral medications carry at least one FODMAP sugar, a group of fermentable carbohydrates that can inflate a sensitive gut. The federal register lists 3296 approved excipients, and their inactive label rests mostly on animal tolerability or long use. When researchers screened them against biological targets, 38 showed 134 activities across 44 targets. Most never reach meaningful blood levels. In the bowel itself, formulation chemicals can be up to 100 times more concentrated than the drug.

Hence the book’s vocabulary: the gut, thirty-two square meters of living surface, is the first brain, and the organ in the skull is the second brain. The second brain rarely encounters these compounds. The first brain handles every one of them, undiluted.

The injury a routine visit cannot see

The anti-inflammatory in that bag is the plainest example of damage that never reaches the chart. Forty healthy volunteers took an ordinary dose for two weeks and then swallowed a capsule camera. New small-bowel findings appeared in 68%, and 40% had open breaks in the lining. In long-term users the camera found visible injury in 71%, compared with 10% of people not taking the drug, and most people with such lesions feel nothing. An acid blocker does not shield the small intestine either: in one trial, injury ran 2.7 times higher when one was added.

Be clear about what that means for testing. Capsule endoscopy and fecal calprotectin, the stool inflammation marker used in those studies, are not Measura tests. They are gastrointestinal studies ordered and performed elsewhere. What they show is that a medication review ending at no stomach pain has not actually looked.

Do medications change your gut bacteria?

The bag also works as a group. In a laboratory screen of more than a thousand marketed compounds, 24% of drugs aimed at human targets slowed the growth of at least one gut bacterial strain. In people the effect is narrower. Across 1,883 human stool metagenomes, acid blockers, metformin, antibiotics and laxatives showed the strongest links, and three of those four classes sat in his bag. In 4,198 people, many drugs taken together produced a distinct microbial structure with weaker short-chain fatty acid metabolism, and the pattern reversed once drugs were stopped.

A disturbed lining and a rearranged community both feed metaflammation, the low-grade metabolic inflammation that sits under insulin resistance, vascular disease and chronic pain. That links a gut story to the numbers the rest of the bag was prescribed for.

Is the reason for each bottle still true?

Here is the part a drug list cannot answer. A good medication audit asks every bottle what it was for, whether that purpose still applies, and what stopping it would trade away. The middle question is a measurement question. It needs the numbers each drug was started to change.

• The metformin was written for blood sugar. Laboratory panels show where blood sugar and lipid markers stand now, not eleven years ago.
• The statin and the blood pressure pill were written for arteries. Arterial stiffness and endothelial function testing looks at how the vessel walls themselves are behaving.
• Weight belongs in the gut story too. In an unselected health-check population, obesity carried an odds ratio of 2.30 for small-bowel breaks and smoking 1.85, apart from aspirin. Bioimpedance body composition separates fat from muscle, which a scale cannot do.
• The fatigue was credited to age. Indirect calorimetry measures resting energy use directly, one piece of an answer instead of an assumption.

None of these tests diagnoses a side effect, and none decides a prescription. They give the physician who owns the list something firmer than habit. Unmeasured is unmanaged, and a bag renewed for a decade is the clearest case of it. For the limits of any single result, read what a test result can and cannot tell you.

How do you prepare for a medication review?

For that man, four changes were made with his cardiologist rather than by him alone. The anti-inflammatory came off. The acid blocker was tapered and reassessed. The laxative and the multivitamin were switched to formulations that fit his dietitian’s sugar list. Every drug with a current reason stayed. The model is a review done with a physician, never a purge done at home.

• Bring the containers themselves; formulations differ by manufacturer.
• Note the year each daily medicine began.
• Ask which number each drug was meant to change, and when it was last checked.
• Change nothing on your own.

Every study above, including the ones that cut against the argument, is in the book’s Deep Dive companion. To plan the visit, use questions worth asking your doctor. The series continues with the nerve that carries the gut’s complaints upward, in what a vagus nerve test can and cannot show.

Frequently asked questions

References

• Reker, D., Blum, S. M., Steiger, C., Anger, K. E., Sommer, J. M., Fanikos, J., & Traverso, G. (2019). “Inactive” ingredients in oral medications. Science Translational Medicine, 11(483), eaau6753. https://doi.org/10.1126/scitranslmed.aau6753
• Pottel, J., Armstrong, D., Zou, L., Fekete, A., Huang, X.-P., Torosyan, H., Bednarczyk, D., Whitebread, S., Bhhatarai, B., Liang, G., Jin, H., Ghaemi, S. N., Slocum, S., Lukacs, K. V., Irwin, J. J., Berg, E. L., Giacomini, K. M., Roth, B. L., Shoichet, B. K., & Urban, L. (2020). The activities of drug inactive ingredients on biological targets. Science, 369(6502), 403–413. https://doi.org/10.1126/science.aaz9906
• Maiden, L., Thjodleifsson, B., Theodors, A., Gonzalez, J., & Bjarnason, I. (2005). A quantitative analysis of NSAID-induced small bowel pathology by capsule enteroscopy. Gastroenterology, 128(5), 1172–1178. https://doi.org/10.1053/j.gastro.2005.03.020
• Graham, D. Y., Opekun, A. R., Willingham, F. F., & Qureshi, W. A. (2005). Visible small-intestinal mucosal injury in chronic NSAID users. Clinical Gastroenterology and Hepatology, 3(1), 55–59. https://doi.org/10.1016/s1542-3565(04)00603-2
• Watanabe, T., Fujiwara, Y., & Chan, F. K. L. (2019). Current knowledge on non-steroidal anti-inflammatory drug-induced small-bowel damage: a comprehensive review. Journal of Gastroenterology, 55(5), 481–495. https://doi.org/10.1007/s00535-019-01657-8
• Maier, L., Pruteanu, M., Kuhn, M., Zeller, G., Telzerow, A., Anderson, E. E., Brochado, A. R., Fernandez, K. C., Dose, H., Mori, H., Patil, K. R., Bork, P., & Typas, A. (2018). Extensive impact of non-antibiotic drugs on human gut bacteria. Nature, 555(7698), 623–628. https://doi.org/10.1038/nature25979
• Vich Vila, A., Collij, V., Sanna, S., Sinha, T., Imhann, F., Bourgonje, A. R., Mujagic, Z., Jonkers, D. M. A. E., Masclee, A. A. M., Fu, J., Kurilshikov, A., Wijmenga, C., Zhernakova, A., & Weersma, R. K. (2020). Impact of commonly used drugs on the composition and metabolic function of the gut microbiota. Nature Communications, 11(1), 362. https://doi.org/10.1038/s41467-019-14177-z
• Nagata, N., Nishijima, S., Miyoshi-Akiyama, T., Kojima, Y., Kimura, M., Aoki, R., Ohsugi, M., Ueki, K., Miki, K., Iwata, E., Hayakawa, K., Ohmagari, N., Oka, S., Mizokami, M., Itoi, T., Kawai, T., Uemura, N., & Hattori, M. (2022). Population-level metagenomics uncovers distinct effects of multiple medications on the human gut microbiome. Gastroenterology, 163(4), 1038–1052. https://doi.org/10.1053/j.gastro.2022.06.070
• Sun, X., Wang, F., Liu, J., Wu, L., Wang, Z., Chen, X., Wang, M., & Zeng, Q. (2022). Risk factors for small-intestinal mucosal breaks beyond aspirin. Journal of Gastroenterology and Hepatology, 37(8), 1596–1602. https://doi.org/10.1111/jgh.15892

Related reading

• Can Inflammation Cause Anxiety? What Blood Work and Testing Show
• Vagus Nerve and Anxiety: What a Heart Reading Shows About Your Gut
• Laboratory Panels

Medically reviewed by Dr. Gurpreet Singh Padda, MD, MBA, MHP, medical director of Measura. Last reviewed September 12, 2026.