Is That Prescription Really Necessary? Why Medication for the Elderly Piles Up Like a Snowball

Is That Prescription Really Necessary? Why Medication for the Elderly Piles Up Like a Snowball

Symptoms You Thought Were Due to "Aging" Might Actually Be Caused by Medication

Swollen feet. Sleeplessness. Muscle pain. Persistent constipation. As people age, these changes are often perceived as "new illnesses" or "age-related decline." However, what if these symptoms were actually side effects of medications you started or increased a while ago?

Without reviewing the medication causing the issue, another drug is added to suppress the current symptoms. This new medication might lead to further health issues, resulting in additional prescriptions. This chain reaction is known as a "prescription cascade."

Of course, there are cases where continuing the initial medication while appropriately managing side effects with another drug is more beneficial. The problem arises when the root cause of the cascade is not examined, and medications simply accumulate.


24 Combinations Identified from Data of About 2.3 Million People

A study published in the medical journal BMJ in September 2026 analyzed the medical data of 2,297,942 seniors aged 66 and older living in Ontario, Canada. Women comprised 54.3% of the total.

The research team first targeted 65 "potentially inappropriate prescription cascades" listed in an international expert consensus in 2025. They prioritized those where the initial medication was used by more than 5% of the population, the subsequent medication was prescribed in more than 1% of cases, and a temporal bias between the two prescriptions was evident.

As a result, 24 combinations met all the criteria. This means that not only were theoretically possible cascades listed, but combinations that were relatively common in large-scale real-world clinical data, with a tendency for the subsequent medication to follow the initial one, were extracted.

The following three combinations had particularly high occurrence rates:

  • From Iron Supplements to Laxatives: 11.9%

  • From Statin Lipid-Lowering Drugs to Painkillers: 10.9%

  • From Cholinesterase Inhibitors to Sleep Medications: 10.3%

Iron supplements can cause gastrointestinal symptoms like constipation. Statins can cause muscle pain or cramps in some people. Cholinesterase inhibitors used for dementia symptoms can disrupt sleep. When looking at symptoms in isolation, adding a laxative, painkiller, or sleep medication might seem natural. However, the key is whether one can pause and consider if the symptoms are related to the initial medication.


"Prescribed Later" Doesn't Prove Causality

It's important not to interpret the 24 combinations identified in this study as a "prohibited list."

The study did not confirm that "this symptom was a side effect of this medication" by reading individual patient records. It was an observational study that identified combinations to pay attention to based on the order and frequency of prescription data. Even if two medications are prescribed in sequence, they might be appropriately treating completely different illnesses.

The "adjusted sequence ratio" used in the study is an indicator of the bias for the second medication to start after the first. Combinations with strong temporal connections included corticosteroids to antipsychotics, laxatives to antidiarrheals, and cholinesterase inhibitors to antiemetics. However, a strong order bias does not mean the first medication necessarily caused the second prescription.

Nevertheless, this study has practical value. It provides 24 patterns that can serve as "alarm systems" to check before adding new medications, not to question every prescription.


Why Are Seniors More Prone to Cascades?

As people age, they are more likely to have multiple chronic conditions and visit more medical departments. Changes in kidney and liver function, body fluid levels, and drug sensitivity compared to when they were younger can lead to side effects at previously tolerated dosages.

Moreover, drug side effects do not always appear immediately after taking them. If they surface weeks, months, or even longer after starting a new medication, it can be difficult for both patients and healthcare providers to recall the connection. Symptoms like swelling, dizziness, decreased appetite, constipation, drowsiness, confusion, and falls can also occur due to illness or aging, making it challenging to differentiate causes.

When visiting multiple medical institutions, information fragmentation can also occur. Painkillers from orthopedics, antihypertensives from cardiology, sleep aids bought at a drugstore, and supplements started for health reasons might not all be consolidated on one screen or in one medication history.

Judging that there are "too many" medications just by their number is also dangerous. It's not uncommon for people to need multiple medications, and uniformly reducing necessary treatments can worsen conditions. The issue with polypharmacy is not merely the number of pills but the state leading to adverse drug events, medication errors, the burden of taking medications, duplication, and interactions.


A Typical Example: "Swelling → Diuretics"

An example that makes understanding prescription cascades easier is ankle swelling caused by calcium channel blockers. Swelling from this type of antihypertensive drug is related to pressure changes in blood vessels and is not necessarily due to simple fluid overload.

If swelling is considered fluid retention from another disease and diuretics are added, the risk of dehydration may increase without adequately addressing the cause. The necessary approach is not a simplistic conclusion that "diuretics are dangerous." Instead, consider when the swelling started, whether it coincides with the start or increase of any medication, whether changes or reductions in the original antihypertensive are possible, and whether another disease is being overlooked.


Empathy and Caution on Social Media, and a Rebuttal to "Just Reduce Medications"

In overseas science communities that introduced this study, the phrase "taking medication for the sake of medication" resonated with many. There were expressions of surprise at the ironic and concerning chain, especially regarding the combination of adding laxatives after iron supplements or antidiarrheals after laxatives.

 

On the other hand, the discussion did not simply conclude with criticism of medications. Posts suggesting that "if there are more than three types of medication, all are for side effect management" were met with rebuttals that polypharmacy might be appropriate for treating multiple chronic conditions, and the number of medications alone cannot determine their appropriateness. Opinions were divided on the frequency of taking iron supplements—daily or every other day—balancing absorption rates and side effects, ultimately suggesting that individual test values and conditions should be confirmed with healthcare providers.

This reaction reflects how the study should be read. Knowing about prescription cascades is not to fear medications or distrust healthcare providers. It is a starting point to reconsider the temporal relationship between new symptoms and existing medications, distinguishing necessary medications from those that can be reviewed. Note that posts on social media reflect personal experiences and opinions and do not indicate medical evidence or general treatment guidelines.


The Same Issue in Japan: The Ministry of Health, Labour and Welfare Updates Countermeasure Materials

This issue is not unique to Canada. In July 2026, Japan's Ministry of Health, Labour and Welfare re-released educational materials summarizing guidelines for the proper use of pharmaceuticals and how to advance countermeasures in hospitals and communities to spread awareness of polypharmacy countermeasures for the elderly.

According to the Ministry's guidelines, polypharmacy is not merely having a large number of medications but a state leading to increased adverse drug events, medication errors, and difficulties in continuing medication. It also highlights the need to consider the relationship between newly emerged symptoms and medications, as adverse drug events in the elderly can be difficult to recognize.

In Japan, primary care physicians, specialists, dentists, pharmacies, hospitals, and nursing facilities may each hold separate medication information. Therefore, it is crucial not to split medication notebooks and to consolidate not only prescription medications but also over-the-counter drugs and supplements. When using electronic medication notebooks, it's also important to ensure no information is missing from paper prescriptions or other apps.


Five Questions to Confirm Before Receiving New Medication

What patients and families can do is not to stop medications based on self-judgment. Some medications can worsen symptoms or cause withdrawal symptoms if abruptly stopped. Instead, the following questions can be used during consultations or medication guidance.

  1. Is it possible that this symptom is a side effect of the medication I am currently taking?

  2. Does the symptom coincide with the time I started or increased the medication?

  3. Before adding a new medication, can the dosage or type of the potentially causative medication be reviewed?

  4. What are the benefits and risks of combining these two medications? When will they be re-evaluated?

  5. Can you review a complete list including prescription drugs, over-the-counter medications, herbal medicines, and supplements?

Keeping a record of symptoms is also helpful. Briefly noting "since when," "at what time of day," "how many hours after taking the medication," and "how much it affects daily life" can make it easier to examine causality during consultations. Compiling a list of medication names, dosages, start dates, and reasons for prescription, and sharing it with family and caregivers, can also be useful in emergencies or hospitalizations.


The Goal Is Not "Deprescribing" but Optimizing Overall Treatment

The term "prescription cascade" has the power to evoke anxiety about medications increasing endlessly. However, the 24 combinations identified by researchers are not instructions to "stop immediately if found."

Treatment requires medications that suppress symptoms, prevent recurrence, and save lives. Even if there are side effects, it may be best to continue while managing them with another medication. Conversely, some medications that have fulfilled their initial purpose may remain out of habit, or they may be switched to less burdensome alternatives.

The important thing is not to compete to reduce the number of medications but to confirm the meaning of each one in light of the patient's condition, lifestyle, values, and treatment goals. When new symptoms appear, consider not only "is it a new illness?" but also "could it have started from medication?" This small check can be the first step in stopping unnecessary prescription cascades.

※This article is intended to provide general information and does not offer individual diagnosis or treatment. Do not reduce or stop prescription medications based on your own judgment; consult a doctor or pharmacist.


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