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Picture a pill organizer on a kitchen table. Seven little boxes, one for each day. Now picture it slowly filling up over a few years. A pill for sore knees. Then a pill for blood pressure. Then something else.
Here is a question almost nobody asks: what if one of those pills is only there because of another one?
Doctors have a name for this. It is called a prescribing cascade. And a large new study has just mapped 24 of the most common ones.
What Is a Prescribing Cascade?
A prescribing cascade starts with a medicine that does its job but also causes a side effect. The side effect looks like a brand-new health problem. So a second medicine is given to treat it.
Sometimes that second medicine has side effects too. And the chain keeps going.
The researchers behind the new study put it simply. It happens when a medication’s side effect “gets mistaken for a new health problem, leading to another prescription that may not have been needed in the first place.”
Here is the example they give. Common pain pills called NSAIDs (the family that includes ibuprofen) can push blood pressure up. When that happens, a person may be given a new blood pressure pill, instead of someone taking a second look at the pain pill. If you take pain relief for sore joints, as many people living with arthritis do, that example may feel close to home.
Nobody in that story did anything obviously wrong. That is exactly what makes it hard to catch.
The New Study: 24 Prescribing Cascades in Older Adults
The study was published in The BMJ on 10 September 2026. It was led by Dr. Paula Rochon, a doctor and researcher at Sinai Health and the University of Toronto in Canada.
Her team worked in two steps. First, with a panel of 12 experts from the United States, Belgium, Italy, Israel and Ireland, they built a list of 65 possible harmful cascades. Then they checked that list against Ontario-wide prescription data held by ICES, the province’s health data institute.
For each cascade they weighed three things: how many people take the first drug, how often the second drug follows it, and how strongly the two are linked. The 24 that rose to the top are the ones seen most often, with real potential to cause harm.
The medicines involved are not rare or exotic. Alongside pain pills, the researchers named everyday drugs such as statins (for cholesterol) and iron supplements among the common starting points.
One honest caution about what the study does and does not say. It maps patterns across a whole population. It does not say that any one person’s second prescription is a mistake. Many second prescriptions are exactly right. The point is to know where to look.
The Doctor Who Named the Problem in the 1990s
Here is the detail that makes this study land differently. Dr. Rochon did not just find prescribing cascades. She helped name them.
Back in the 1990s, she and a colleague, Dr. Jerry Gurwitz, described the idea in medical journals, including a 1997 paper in the very same journal, The BMJ. Researchers around the world have studied it ever since. One classic example: some blood pressure pills called calcium channel blockers can cause swollen ankles, and that swelling is sometimes treated with a water pill.
So the idea is decades old and well known to experts. And yet, speaking about the new study, Dr. Rochon said: “These sequences of events are common but often missed in clinical practice.”
Sit with that for a second. The problem has had a name for about thirty years, and it still slips through. That tells you this is not mainly a knowledge problem. It is a seeing problem.
Why Prescribing Cascades Are So Easy to Miss
Dr. Rochon put her finger on it: “people don’t recognize the sequences of events and that they are connected to one another.”
Think about how care often works. You might see one doctor for your joints and another for your heart. You fill prescriptions at different times. A side effect may show up weeks after a new pill starts. Medicines can even leave traces in the body long after you stop them, as researchers found when they looked at how long medications affect your gut bacteria. By the time a new symptom appears, nobody is holding the whole timeline in their head. Often not even you.
Each visit looks at the problem in front of it. Each decision can make sense on its own. The trouble only shows when you line everything up in order.
The study team says older adults are especially at risk, because many take several medicines at once. They also point out that older women carry extra risk: women tend to live with more long-term health conditions than men, receive more medicines, and have more side effects from them.
If you look after an aging parent, you may already know how heavy this feels. Keeping track of someone else’s pills, appointments and symptoms is real work. If it is wearing you down, the free Am I Burned Out From Caregiving? check can help you see where you stand.
How to Spot a Possible Prescribing Cascade
First, the most important rule: never stop or change a medicine on your own. Some medicines are dangerous to stop suddenly. The answer to a possible cascade is a conversation with a doctor or pharmacist, not a guess at home.
With that said, here is what actually helps. None of it costs money.
- Make one list. Write down every medicine you take, including pills bought without a prescription, vitamins and supplements. Next to each one, write two things: when you started it, and why. This is exactly what Dr. Rochon says matters: knowing what you take, “when they were started and for what indication.”
- Put it in order. Line the list up by start date. Then look for any new symptom that showed up not long after a new medicine began.
- Ask one simple question. At your next visit, or at the pharmacy counter, ask: “Could this new problem be a side effect of something I already take?”
- Bring everything at once. Many pharmacists and doctors will look over all your medicines in one sitting if you bring them in a bag or bring your list. This is sometimes called a “brown bag” review. In many places a pharmacist is the easiest person to ask.
- Keep the list with you. A photo of it on your phone means any doctor, anywhere, can see the whole picture.
The researchers are also pushing for changes on the system side: computer tools that flag a likely cascade while a prescription is being written, and pharmacists working more closely with doctors. You do not have to wait for that, though. A written list, in the right order, does a lot of the same work.
The Question That Stops the Chain
There is a very old story about a woman who had been sick for twelve years. She had seen many doctors. She had spent everything she had. And instead of getting better, she only got worse.
People have been telling that story for two thousand years, and it sounds a lot like a prescribing cascade: one treatment after another, each aimed at the problem in front of it, while the person underneath slowly gets lost.
What happens next is the part worth noticing. She reaches out in a crowd, and the healer at the center of the story stops. Everything stops. The question that follows is not “what is your symptom?” It is “who touched me?” The healer went looking for the person, and she ended up telling her whole story.
Interestingly, one of the people who wrote that story down is traditionally remembered as a doctor himself, and his telling is noticeably gentler on the physicians. The story was never really against medicine. It is about being seen whole.
Maybe that is a glimpse of what God is like: not a system that processes one symptom at a time, but someone who stops for the person.
Take a Second Look
The fix for a prescribing cascade is not dramatic. It is someone slowing down long enough to see the whole story, in order, and asking how the pieces connect.
You can be that someone, for yourself or for a parent you love. This week, write the list. Put the dates beside it. Take it to the pharmacist.
It might change nothing. Or it might mean one less pill in that little box on the kitchen table.
Discussion Question
Whose job should it be to catch a prescribing cascade: the doctor, the pharmacist, or the patient? Tell us what you think in the comments below.
Share This
Post 1: TIL there is a name for when a medicine’s side effect gets treated like a new disease, with another medicine. It is called a prescribing cascade, and a new study just mapped 24 common ones. https://bgodinspired.com/?p=115252
Post 2: Going through my mom’s pills this weekend with one question: could any of these be treating a side effect of another one? Apparently it happens a lot, even though doctors have known about it for 30 years. Worth a read if you help anyone with their meds: https://bgodinspired.com/?p=115252
Post 3: Simple thing I learned today: write down every medicine you take, when you started it, and why. Then ask a pharmacist to look at it all together. https://bgodinspired.com/?p=115252
Questions and Answers (Q&A)
What is a prescribing cascade?
A prescribing cascade happens when the side effect of one medicine is mistaken for a new health problem, and a second medicine is prescribed to treat it. The second medicine may not have been needed, and it can bring side effects of its own. A well-known example is when a pain reliever called an NSAID raises blood pressure and a blood pressure pill is added instead of the pain reliever being reviewed.
What did the 2026 BMJ study on prescribing cascades find?
A study published in The BMJ on 10 September 2026, led by Dr. Paula Rochon of Sinai Health and the University of Toronto, identified 24 potentially inappropriate prescribing cascades that were the most common and had potential to cause harm among older adults in Ontario, Canada. The team started from a list of 65 possible cascades built with 12 international experts and checked it against Ontario-wide prescription data.
Who is most at risk of a prescribing cascade?
Older adults are most at risk of prescribing cascades because many take several medicines at the same time. Researchers also say older women face extra risk, because women tend to live with more chronic health conditions than men, receive more medicines, and experience more side effects from them.
Should I stop a medicine if I think it is part of a prescribing cascade?
No. A person should never stop or change a medicine on their own, because some medicines are dangerous to stop suddenly. The safe step is to write a list of every medicine with the date each one was started and the reason for it, then ask a doctor or pharmacist whether a newer symptom could be a side effect of an older medicine.
How can I check my medicines for a prescribing cascade?
To check for a prescribing cascade, list every medicine, vitamin and supplement you take, along with when each one started and why. Put the list in date order and look for new symptoms that appeared soon after a new medicine began. Then bring the list, or the medicines themselves, to a pharmacist or doctor and ask them to review everything together.
Source: University of Toronto Temerty Faculty of Medicine, Ontario study identifies potentially harmful drug combinations prescribed to older adults. This article is general information, not medical advice. Always talk to a doctor or pharmacist before changing any medicine.
