Research shows that taking multiple medications together—especially those causing drowsiness—significantly reduces daily activity in aging in ways that cannot be predicted from studying single drugs alone, according to Gram Research analysis. When medications are gradually stopped, some activity may return, but some changes appear permanent, suggesting that careful medication management is crucial for maintaining function in older age.
Researchers studied how taking multiple medications affects the daily activity levels and health of aging mice. They found that combining several drugs—especially those that cause drowsiness—significantly reduced activity in ways that couldn’t be predicted by studying single drugs alone. When researchers stopped the medications gradually, some activity returned, but some changes were permanent. This research helps scientists understand how medication combinations impact older adults’ ability to stay active and independent, which is crucial for developing better treatment strategies for aging populations.
Key Statistics
A 2026 research article published in The Journals of Gerontology found that polypharmacy with increasing sedative and anticholinergic medication burden substantially altered daily activity patterns in aged mice in ways that differed from single-medication effects.
The same 2026 study identified that while some activity reductions were reversible after gradual medication withdrawal (deprescribing), other changes from prolonged polypharmacy proved irreversible, indicating lasting impacts on aging trajectories.
Research from 2026 demonstrated that mice receiving multiple medications showed four distinct aging clusters with different frailty trajectories and activity patterns, suggesting individual responses to polypharmacy vary significantly based on underlying health status.
The Quick Take
- What they studied: How taking multiple medications together affects daily activity levels and aging in older mice, and whether stopping these medications could reverse the effects.
- Who participated: Aged male mice (C57BL/6J strain) studied from 12 to 24 months old, receiving different combinations of medications or control diets over time.
- Key finding: Multiple medications with sedating effects significantly reduced activity levels in ways that were different and more complex than what researchers would expect from studying single drugs alone. Some activity improvements occurred after stopping medications, but some changes were permanent.
- What it means for you: This research suggests that older adults taking multiple medications may experience reduced activity and energy levels that are harder to predict and reverse than previously thought. Talk with your doctor about whether all your medications are still necessary, as some may be contributing to decreased activity without providing clear benefits.
The Research Details
Scientists used aging mice to study how different medication combinations affect daily activity and aging. Starting at 12 months old, mice received either a control diet or various medications—some mice took just one medication (monotherapy) while others took multiple medications together (polypharmacy). The researchers used a special cage with cameras and sensors called LABORAS that automatically tracked every movement and activity the mice made for 23 hours continuously. At 21 months, some mice continued their medications while others had their medications gradually stopped (deprescribed). At 24 months, all mice were monitored to see how active they were and how their aging process had progressed.
The researchers paid special attention to medications that cause drowsiness or affect how the brain controls body functions (anticholinergic drugs). They measured something called the Drug Burden Index, which shows the total amount of sedating effects from all medications combined. This approach allowed them to see whether taking multiple medications together created different effects than taking them separately.
This research design is important because it shows that multiple medications don’t just add up their individual effects—they interact in complex ways that are hard to predict. Most medication studies test one drug at a time, but older adults often take many drugs together. By studying medication combinations in a controlled way, researchers can better understand real-world situations and develop safer treatment strategies for aging populations.
This is a controlled laboratory study using mice, which allows researchers to carefully control variables and track detailed behavioral changes over time. The use of automated monitoring (LABORAS) provides objective measurements rather than relying on observation alone. However, because this is animal research, the findings need to be tested in humans before being applied to medical practice. The study was published in a respected gerontology journal, indicating peer review by experts in aging research.
What the Results Show
The research revealed that mice taking multiple medications with increasing sedating effects showed substantially reduced activity levels. Importantly, this reduction in activity could not be predicted by studying what happened when mice took single medications alone. The combination of drugs created unique effects that were more complex than researchers expected.
When researchers gradually stopped the medications (deprescribing), some of the activity loss reversed—mice became more active again. However, not all changes were reversible. Some mice showed permanent reductions in activity even after medications were stopped, suggesting that prolonged medication use may cause lasting changes to aging and function.
The researchers identified four distinct groups of mice based on their aging patterns and how they responded to medications and deprescribing. Each group showed different relationships between medication use, activity levels, and aging trajectories. This suggests that older individuals may respond differently to the same medications depending on their underlying health status and aging patterns.
The study found that the relationship between frailty (weakness and reduced function) and daily activity patterns was different for each medication group. This means that medications don’t just reduce activity—they change the pattern and quality of movement in ways that reflect different types of aging. The researchers also discovered that deprescribing created some unexpected changes in behavior, suggesting that stopping medications can have complex effects beyond simply reversing the original medication effects.
Previous research has typically studied single medications in isolation, making it difficult to understand how older adults actually experience medication use, since most take multiple drugs. This study advances the field by demonstrating that polypharmacy (multiple medications) creates effects that cannot be simply predicted from single-drug studies. The findings support growing evidence that deprescribing—carefully stopping unnecessary medications—may help older adults maintain function, though the process is more complex than simply reversing medication effects.
This research was conducted in mice, not humans, so results may not directly apply to people. Mice age differently than humans and may respond to medications differently. The study didn’t specify the exact number of mice used in each group, making it harder to assess statistical reliability. Additionally, the specific medications used in mice may not perfectly match those commonly prescribed to older adults. The research provides important insights but needs to be followed by human studies to confirm these findings apply to real-world medication management in aging populations.
The Bottom Line
According to Gram Research analysis, older adults should regularly review all medications with their healthcare provider to identify which ones are truly necessary (moderate confidence). Gradual deprescribing under medical supervision may help restore some activity and function, though benefits may be incomplete (moderate confidence). Healthcare providers should recognize that medication combinations create complex effects that differ from single drugs and require individualized assessment (strong confidence).
Older adults taking multiple medications, particularly those experiencing reduced activity or energy levels, should discuss medication necessity with their doctors. Family members of aging relatives should encourage regular medication reviews. Healthcare providers managing older patients with polypharmacy should consider deprescribing as part of comprehensive care. This research is less relevant for younger, healthier individuals taking few medications.
Improvements in activity and function after deprescribing may begin within weeks to months, though some changes may take longer. However, this research suggests that some effects of long-term polypharmacy may be permanent, so prevention through careful medication management is important. Realistic expectations should be discussed with healthcare providers, as individual responses vary significantly.
Frequently Asked Questions
Can stopping multiple medications help older people become more active?
Research suggests some activity may return after gradually stopping medications, but not all changes reverse. A 2026 study found that while deprescribing improved some activity measures, certain effects from long-term polypharmacy appeared permanent, so prevention through careful medication management matters most.
Why do multiple medications affect activity differently than single drugs?
Multiple medications interact in complex ways that create effects beyond what each drug does alone. A 2026 study showed polypharmacy effects couldn’t be predicted from single-drug responses, suggesting medications combine in unpredictable ways that require individualized assessment by healthcare providers.
How can I tell if my medications are reducing my activity level?
Track your daily activity and energy levels, noting which medications you take. Discuss patterns with your doctor, especially if you notice reduced movement or fatigue. A 2026 study suggests reviewing medication necessity regularly, as some drugs may reduce activity without providing clear benefits.
Is deprescribing safe for older adults taking many medications?
Deprescribing under medical supervision may help restore function, but requires careful planning. A 2026 study found some effects are reversible while others are permanent, emphasizing that gradual withdrawal with doctor guidance is essential rather than stopping medications abruptly.
What should I discuss with my doctor about my medications?
Ask which medications are essential, whether any can be reduced or stopped, and how to monitor for changes. Research from 2026 shows that medication combinations affect aging differently for each person, so individualized review focusing on activity and function is important for maintaining independence.
Want to Apply This Research?
- Track daily activity minutes and energy levels weekly using your app’s activity log. Record which medications you’re taking and note any changes in activity after medication adjustments. Compare weekly activity averages to identify patterns related to medication changes.
- Work with your doctor to create a medication review schedule (quarterly or semi-annually). Use your app to document which medications you’re taking and any side effects like reduced energy or activity. Set reminders to discuss deprescribing opportunities at each doctor visit.
- Establish a baseline of your current activity level and energy. After any medication changes, monitor activity for 4-8 weeks to see if patterns shift. Track not just total activity but also the quality of movement (walking smoothly vs. slowly, for example). Share this data with your healthcare provider to inform future medication decisions.
This research was conducted in mice and has not yet been tested in humans. While the findings provide important insights into how medication combinations may affect aging and activity, individual responses to medications vary significantly. Do not stop or change any medications without consulting your healthcare provider. This article is for educational purposes and should not replace professional medical advice. Always discuss medication management, deprescribing, or activity concerns with your doctor or pharmacist who understands your complete medical history.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.