Over the Counter Medications and Elderly Risks Every Caregiver Should Know

The Drugs Nobody Thinks to Mention

When the doctor asks your parent what medications they take, the answer almost always leaves out the over-the-counter drugs. The daily ibuprofen for knee pain. The Benadryl for sleep. The antacid after every meal. The laxative that's become a daily habit. The herbal supplement a friend recommended for memory.

These aren't mentioned because most people don't think of them as "medications." But in an aging body with altered metabolism, reduced kidney function, and five or more prescriptions already in the mix, over-the-counter drugs carry real clinical risks — and they interact with prescription medications in ways that can be dangerous.

The Highest-Risk OTC Categories for Elderly Adults

Anticholinergic drugs are the single most concerning OTC category for older adults, and they're everywhere. Diphenhydramine (Benadryl, Tylenol PM, ZzzQuil), dimenhydrinate (Dramamine), and doxylamine (Unisom) are all first-generation antihistamines with strong anticholinergic properties. The American Geriatrics Society's Beers Criteria — the reference standard for identifying medications that are potentially inappropriate for older adults — explicitly flags these drugs because they increase the risk of confusion, cognitive impairment, falls, urinary retention, and constipation. In elderly adults, these effects aren't minor side effects — they can trigger delirium that mimics dementia or cause falls that result in hip fractures.

Your parent may have been taking Benadryl for sleep for years without obvious problems. But aging changes how the body processes anticholinergic drugs: clearance slows, brain sensitivity increases, and the cumulative anticholinergic burden from multiple drugs compounds the risk. Research has linked long-term anticholinergic use to increased dementia risk, though the relationship is still being studied.

NSAIDs (ibuprofen, naproxen) are the most commonly used OTC pain relievers in older adults, and they carry escalating risks with age. Gastrointestinal bleeding is the most acute concern — NSAIDs reduce the protective mucus lining of the stomach, and the risk increases substantially in adults over 65, especially those taking blood thinners (warfarin, apixaban, rivaroxaban) or corticosteroids concurrently. NSAIDs also elevate blood pressure and can reduce kidney function, creating problems for patients already on hypertension medications or those with even mild kidney disease.

Proton pump inhibitors (omeprazole, lansoprazole) are sold OTC for acid reflux and heartburn. Short-term use is generally safe, but many elderly patients take them daily for years without medical oversight. Long-term PPI use is associated with increased fracture risk (they reduce calcium absorption), vitamin B12 deficiency, magnesium depletion, and a possible increase in Clostridioides difficile (C. diff) infections. If your parent has been on a PPI for more than 8 weeks without a doctor reviewing the need, that conversation is overdue.

Decongestants (pseudoephedrine, phenylephrine) raise blood pressure and heart rate. In an elderly patient with hypertension or heart disease, a standard dose of Sudafed can cause a clinically significant blood pressure spike. Many cold and flu combination products contain decongestants, so check the active ingredients of anything in your parent's medicine cabinet that says "multi-symptom" or "severe."

How to Check for Drug Interactions

No caregiver should be expected to memorize every possible drug interaction. But you can build a reliable checking habit:

Use your parent's pharmacy. If all prescriptions go through one pharmacy, the pharmacist's system automatically flags interactions when a new prescription is added. But OTC drugs bypass this system because they aren't dispensed through the pharmacy computer. Tell the pharmacist about every OTC your parent takes and ask them to run an interaction check against the full prescription list. This service is free.

Consolidate to one pharmacy. If your parent fills prescriptions at two or more pharmacies (common when specialists send prescriptions to different locations), the interaction-checking system fails because no single pharmacy sees the complete picture. Consolidate everything at one pharmacy — the simplest, most effective safety measure available.

Bring the brown bag. At least once a year, gather every prescription bottle, OTC product, and supplement in the house, put them in a bag, and bring them to the doctor or pharmacist. This is the brown bag medication review approach, and it consistently uncovers drugs that nobody knew about, expired medications still being taken, and interactions that were never flagged because the OTC was never disclosed.

Having the Conversation with the Doctor

At the next appointment, add this to your prepared agenda: "We'd like to review all over-the-counter medications and supplements for safety." Bring the complete list — or the physical products — and ask three questions:

1. "Are any of these on the Beers Criteria list for potentially inappropriate medications?"
2. "Do any of these interact with current prescriptions?"
3. "Are there safer alternatives for the symptoms these are treating?"

For the Benadryl-for-sleep question specifically, ask about melatonin (lower risk, though evidence for efficacy in elderly adults is mixed), sleep hygiene changes, or whether the insomnia might be a side effect of another medication that could be adjusted.

For pain management, acetaminophen (Tylenol) is generally the first-line OTC option for older adults because it avoids the GI and cardiovascular risks of NSAIDs — but it has its own ceiling (no more than 3,000 mg per day, or 2,000 mg for patients with liver concerns) and interacts with warfarin.

The Caregiver's Guide to Doctor Communication includes a Master Medication Log with dedicated fields for OTC drugs and supplements, plus a medication review discussion guide structured around the Beers Criteria categories most relevant to elderly adults.