The Allergy Pill That Almost Killed Her
When More Pills are Not the Answer
A couple of months ago, I got a text from Maria.
Her 78-year-old mother, Janet, had started taking Benadryl for spring allergies. Seemed harmless enough—just an over-the-counter antihistamine, the kind you buy at CVS without a second thought.
By the following week, Janet couldn’t urinate properly.
By week three, she’d fallen twice.
By week four, Maria and I were on a video call with a crumpled medication list in her hand and tears in her eyes, asking the question I hear too often:
“How did we get here?”
The answer: The Prescribing Cascade.
And it almost killed her mother.
How One Pill Became Seven
Here’s what happened to Janet—and I promise you, this happens every single day in America.
The antihistamine Janet took is one of the most common allergy pills on the market. For a 45-year-old, it’s a totally fine choice. For a 78-year-old woman, it causes a hidden side effect called anticholinergic toxicity—which shows up as urinary retention, confusion, dry mouth, unbalanced, and blurred vision.
But Janet’s primary care doctor didn’t know she’d started taking Benadryl. She bought it over-the-counter. Why would she mention it?
So when Janet showed up saying she couldn’t urinate, her doctor referred her to a urologist.
The urologist didn’t ask about the antihistamine either. He assumed it was a bladder issue common in aging women and prescribed a medication to help her bladder empty more completely.
That medication—a common one called tamsulosin—works by relaxing smooth muscle. Including the smooth muscle in blood vessels.
Which means it dropped Janet’s blood pressure.
When Janet got dizzy standing up from the couch, her primary care doctor prescribed meclizine, a vertigo pill.
When the dizziness continued and she fell in the kitchen—hard enough to bruise her hip and crack a rib—the emergency room doctor added a muscle relaxer for the pain.
By the time Maria brought her mother to see me, Janet was on seven medications.
Not one of them was treating the original problem.
All of them started because nobody connected the dots back to a $6 bottle of Benadryl.
This Is the Prescribing Cascade
The prescribing cascade happens when a side effect of one medication is mistaken for a new medical condition—and instead of removing the offending drug, a second medication is prescribed to “treat” the symptom caused by the first.
Then that second medication causes a side effect.
So a third medication gets added.
And the cycle continues.
It happens to about 25% of older adults, according to research.
It’s not your parent’s fault. It’s not even your doctor’s fault, exactly. It’s the system’s fault. The system rewards for prescribing more, not discussing the timeline of new symptoms and the start of a new medication.
Nobody’s asking: “What changed two weeks ago?”
And here’s the most dangerous part: These side effects get dismissed as normal aging.
Confusion? “Well, she’s 78.”
Dizziness? “Balance gets worse as you age.”
Falls? “That’s just what happens.”
But it’s not. It’s medication toxicity disguised as aging.
Here’s What Caregivers Miss (And Why It Matters)
When a new symptom appears—confusion, dizziness, falls, digestive problems, insomnia—your instinct might be to panic.
Is it dementia?
Is it a stroke?
Is she falling apart?
Your first question might be: “What new disease does she have?”
But the right question is: “What changed in the last two weeks?”
Because here’s what I’ve learned after decades in geriatric pharmacology:
Side effects can masquerade as aging.
Let me show you the patterns:
The Cognitive Cascade
A sleep medication (like Ambien, Benadryl, or anything with “PM” in the name) causes daytime confusion and memory problems. You assume it’s early dementia. The doctor prescribes Aricept or Namenda for “memory enhancement.”
But your mother wasn’t developing Alzheimer’s. She was experiencing anticholinergic toxicity from the sleep pill.
The Balance Cascade
A blood pressure medication causes orthostatic hypotension—a drop in blood pressure when standing up. Your parent gets dizzy and unsteady. The doctor assumes it’s a balance disorder and prescribes meclizine (a vertigo pill) or refers them to physical therapy.
But the problem wasn’t balance. It was the blood pressure medication dose being too high for an aging body with less blood volume and stiffer arteries.
The Digestive Cascade
Long-term use of NSAIDs (ibuprofen, naproxen) causes stomach irritation and acid reflux. The doctor prescribes a proton pump inhibitor (PPI) like omeprazole to “protect the stomach.”
But PPIs interfere with calcium absorption. Over time, this leads to bone fractures. So now there’s a prescription for a bone-building medication. Which causes severe digestive side effects. Which leads to more medications.
All because nobody asked: “Could we just stop the ibuprofen?”
A Case Study That Changed My Practice
Let me tell you about Sarah.
Sarah came to me on seven medications. She was falling constantly, confused most of the day, and had given up trying to live independently. She told her daughter she felt like she was “losing her mind.”
Her daughter thought it was dementia. The neurologist wasn’t sure. The primary care doctor said it was “just aging.”
I did something that should have been done months earlier:
A comprehensive medication review.
I pulled every bottle out of her bag. Made sure each had a purpose. I cross-referenced every side effect profile against her symptoms.
And there it was—clear as day:
The confusion started three weeks after her doctor added a sleep medication.
The falls began two weeks after her blood pressure pill dose was increased.
The digestive issues appeared right after she started taking ibuprofen for knee pain.
Every single symptom had a medication fingerprint. None of it was “just aging.”
I made three phone calls to her prescribers. We stopped three medications. We adjusted one dose.
Within two weeks, Sarah was back to her baseline.
No confusion. No falls. Sharp as ever. Still independent.
She was never sick. She was medicated.
And here’s what haunts me: If someone had done this review six months earlier—before she gave up her independence, before her daughter started researching memory care facilities, before Sarah started believing she was losing her mind—all of that suffering could have been prevented.
What you Bring to the Table as the Caregiver
Here’s the truth that healthcare systems don’t admit enough:
You are the only person who sees your parent every single day.
You notice when the confusion started. You saw the fall that happened three days after the new prescription. You know that your mother was totally fine until that bottle showed up in the medicine cabinet.
Doctors see a snapshot. A 15-minute appointment every three months or less.
You see more than a snapshot, you see the film. The whole story.
Research shows that 80–90% of older adults are willing to stop a medication if their healthcare provider suggests it’s possible. The barrier to safety isn’t the patient. It’s the lack of a comprehensive medication review—and someone like you who can advocate for it.
Right now, your parent needs a full medication audit. Not a timeline—that comes later. Right now, you need someone who can look at every single medication, understand the interactions, spot the cascades, and work with the prescribers to untangle the mess.
Going forward, though? That’s when the timeline becomes your greatest data point.
Starting Today: Track New Symptoms
From this moment forward, any time a new symptom appears, ask yourself:
“What changed in the last two weeks?”
Write it down:
“Mom started getting dizzy on March 15th. She started the new blood pressure pill on March 8th.”
“Dad became confused on Tuesday. He started the sleep medication on Friday.”
That’s the data that prevents the next cascade from starting.
This Week’s Action Plan
Step 1: Schedule a Comprehensive Medication Review
If your parent is on more than five medications, experiencing falls, confusion, dizziness, or any new symptoms—they need a professional medication audit. Not next month. Now.
This isn’t something you can DIY with Google. You need a clinical pharmacist or geriatric specialist who can:
Review every medication for appropriateness
Identify drug interactions and cascades
Work with prescribers to safely deprescribe
Create a simplified, safer regimen
[Schedule a Medication Review with MyRxPro]
Step 2: Get the Free Caregiver’s Toolkit
I’ve created a free toolkit to help you prevent future cascades:
→ The Master Medication List
Your essential document for doctor visits. One page that shows every medication, dose, prescriber, and reason. So each doctor knows what else your parent is on. Click here to see our Newsletter, “The Medication List: A Step-by-Step Guide.“
→ The One Page Briefing
This helps to organize your priorities and to provide the data to advocate like a pro! Get the most out of each visit. Click here to see our Newsletter, “How to Reclaim Your Parent’s Doctor Visit.“
→ Dementia vs Delirium
Use this handy chart to tell the difference between Dementia vs Delirium. Delirium is an emergency. Put this on your fridge; it could save a life!
→ The Teach-Back Script
Make sure you and the doctor are on the same page before you leave the appointment.
Step 3: Ask the Right Question
At your next doctor’s appointment, before any new medication gets added, ask:
“Could this symptom be caused by her current medications instead of a new disease? Here is her updated medication list; could any of these be causing this symptom?”
That one question—asked respectfully—can stop a cascade before it starts.
The Deeper Story
For those of you who want to go deeper—to understand not just how to spot a cascade, but why the system lets it happen, and what you can actually do about it—I wrote a book.
It’s called Fewer Pills, More Paws.
It’s about the biology of aging, the pharmacology of harm, homeostenosis, the narrow buffer zone your aging parent is navigating, and what you can actually do to support independence.
And yes, there’s a part about what our pets can teach us about caregiving and biology that might surprise you. (Hint: They don’t overthink. They don’t catastrophize. They just respond. There’s wisdom in that.)
The paperback is available now for pre-order:
Paperback:
Indie bookstores: Bookshop.org
Major retailers: Barnes & Noble, Walmart (Amazon is coming soon)
E-Book:
Indie bookstores: Bookshop.org
Major retailers: Amazon, Barnes & Noble, Walmart
Direct from MyRxPro: MyRxPro.com/books
Hardcover will be available for pre-order soon. Audiobook will be available mid-summer.
The Real Reason I’m Telling You This
I’m tired of watching this happen.
I’m tired of watching families blame themselves for a parent’s decline when the decline was iatrogenic—caused by the healthcare system itself.
I’m tired of the moment when the caregiver finally realizes:
She wasn’t getting worse. She was being over medicated.
You don’t have to be that family.
You can be the one who sees the timeline. The one who asks the right question. The one who saves your parent from a cascade that nobody else is paying attention to.
That’s the whole point of this work.
Peace and wisdom,
David Lee, PharmD, PhD Founder, MyRxPro