Medication Safety for Older Adults: A Practical Guide for Patients and Families

Why Medication Safety Is Especially Important for Older Adults

Older adults are disproportionately affected by medication-related problems for several interconnected reasons. The majority of people over 65 take at least one prescription medication, and many take five or more simultaneously, a situation known as polypharmacy. Each additional medication adds complexity to the management process and increases the risk of interactions between drugs.

The body processes medications differently as it ages. Kidney and liver function typically decline over time, slowing the rate at which drugs are metabolised and eliminated from the body. This means that standard adult doses may remain active in the body for longer than anticipated in older adults, leading to higher effective concentrations and an increased likelihood of side effects.

Body composition changes with age as well, with a reduced proportion of body water and increased proportion of body fat. Many medications are water-soluble and are therefore present at higher concentrations in the body when the proportion of water is lower. Fat-soluble drugs accumulate in body fat and may persist for longer than expected.

Despite these challenges, medications are of course essential for managing the health conditions that become more common with age. The goal of medication safety is not to avoid medications but to use them as effectively and safely as possible.

The Challenge of Polypharmacy

Polypharmacy, taking five or more medications simultaneously, affects a very large proportion of older adults and is associated with significantly increased risks of adverse effects, drug interactions, and medication errors. This is not because any individual medication is necessarily problematic, but because the combined effects of multiple drugs interacting within the body are extraordinarily complex and sometimes difficult for any individual prescriber to fully anticipate.

A particular challenge arises when different conditions are managed by different specialists who may not have complete visibility of all medications prescribed by their colleagues. A cardiologist, a rheumatologist, and a GP may each prescribe appropriately for their specific area of concern, but the combined list may create interactions that none of them has specifically considered.

Medication reviews, conducted by a GP, pharmacist, or specialist medicines management team, assess all of a patient's current medications together and identify opportunities to simplify the regimen, discontinue medications that may no longer be needed, and address potential interactions. Regular medication reviews are standard practice in good primary care for older adults and are generally available on request.

Understanding Your Medications

Understanding what each of your medications is for, how it works, and what side effects to watch for is a fundamental element of safe medication use. You are entitled to this information from your prescribing doctor and from your pharmacist, and asking for it is an entirely appropriate and sensible thing to do.

For each medication you take, it is helpful to know its purpose, whether it is a long-term medication or a short-term course, what dose you are taking and how this compares to the standard range, the most common side effects and how to manage them, any specific interactions with other medications or foods, and whether there are any activities, including driving, that should be approached with caution while taking it.

Keep an up-to-date written list of all your medications, including the dose and frequency, and carry it with you at all times. In an emergency, this list allows healthcare professionals to quickly understand your current treatment. Many people keep this list in their wallet or on their phone. Share it with a trusted family member as well.

Common Medication Errors and How to Prevent Them

Medication errors in older adults most commonly fall into a few well-recognised categories. Taking the wrong dose, either too much or too little, is particularly common in people managing complex regimens. This may happen because of confusion between similar-looking tablets, difficulty reading small print on labels, forgetting whether a dose has already been taken, or misunderstanding the prescribed instructions.

A dosette box or medication organiser, which divides medications into compartments for each day of the week and each time of day, addresses several of these problems simultaneously. It provides an immediate visual check of whether a dose has been taken, helps distinguish medications that might otherwise look similar, and makes managing a complex regimen significantly easier.

Taking medications at the wrong time relative to food or other medications is another common error. Some medications must be taken on an empty stomach to be absorbed correctly, while others should be taken with food to reduce stomach irritation. Some medications should not be taken within several hours of each other. Understanding these timing requirements for your specific medications is worthwhile and your pharmacist is an excellent resource for this information.

Discontinuing medications without medical advice is a frequent and sometimes dangerous error. Medications for conditions such as high blood pressure, heart disease, epilepsy, or mental health conditions typically need to be withdrawn gradually rather than stopped suddenly, and stopping them abruptly can cause serious problems. If you want to stop or reduce a medication, discuss this with your doctor first.

Drug Interactions: What You Need to Know

Drug interactions occur when one medication affects the way another medication works in the body, either increasing or decreasing its effectiveness or altering its side effect profile. The likelihood of a significant drug interaction increases substantially as the number of medications increases.

Some drug interactions are well known and well documented. Warfarin, a commonly prescribed blood-thinning medication, interacts with a very large number of other drugs, foods, and supplements, which can cause the blood to become either too thin, increasing bleeding risk, or not thin enough, increasing clot risk. Close monitoring is required whenever any change is made to the medication regimen of a person taking warfarin.

Over-the-counter medications and herbal supplements can also interact with prescription medications in ways that are not always obvious. St John's Wort, a herbal remedy used for low mood, interacts significantly with a number of prescription medications including antidepressants, blood thinners, and immunosuppressants. Ibuprofen and similar anti-inflammatory medications can interact with blood pressure drugs and increase the risk of kidney problems.

Always inform your doctor and pharmacist of all medications you are taking, including over-the-counter preparations and any herbal or dietary supplements. This complete picture allows them to check for interactions before prescribing anything new.

Side Effects in Older Adults

Side effects from medications are more common and often more pronounced in older adults than in younger people, for the physiological reasons described earlier. Some side effects that are mild inconveniences in younger people, such as slight dizziness, can be genuinely dangerous in older adults because they increase the risk of falls.

Medications that commonly cause dizziness, sedation, or impaired balance in older adults include sleeping tablets and sedatives, some antidepressants and antipsychotics, certain blood pressure medications, antihistamines, and some pain medications including opioids. The risks of these medications need to be carefully weighed against their benefits in older adults, and this discussion is an entirely appropriate one to have with your prescribing doctor.

Constipation is a side effect of several commonly prescribed medications including iron supplements, some painkillers, and certain antacids, and can be particularly problematic for older adults who may already be predisposed to this issue due to reduced mobility or fluid intake.

If you experience a new symptom after starting a new medication, consider whether it might be a side effect and raise it with your doctor or pharmacist. Do not assume that all new symptoms represent new medical conditions; many are in fact reactions to medications that can be addressed by adjusting the dose or switching to an alternative.

Medication Storage and Handling

Correct storage of medications is important for maintaining their effectiveness and safety. Most medications should be stored at room temperature, away from direct sunlight, moisture, and heat. The bathroom medicine cabinet, despite its traditional name, is often one of the less suitable places to store medications due to the humidity created by baths and showers.

Keep medications out of reach of children and pets. Even a brief visit from grandchildren creates a potential risk if medications are accessible. Child-resistant packaging provides some protection but should not be relied upon as the sole barrier.

Dispose of expired or discontinued medications safely rather than simply throwing them away or flushing them. Many pharmacies accept medications for safe disposal, which prevents them from being misused or causing environmental harm.

Working Effectively with Your Healthcare Team

The patient-doctor relationship is most effective as a partnership in which both parties contribute actively. As a patient, you are the authority on how you experience your medications, including side effects and practical difficulties with your regimen. This information is essential for your healthcare team to make the best possible decisions.

Be honest with your doctor about whether you are actually taking medications as prescribed. Non-adherence to prescribed medication regimens is very common and understandable, whether due to side effects, cost, practical difficulty, or simply forgetting. Your doctor cannot help you optimise your regimen if they do not know how it is actually being used.

Ask for written information about new medications at the time of prescription. Verbal instructions given during a consultation are easily forgotten, particularly when multiple pieces of information are being shared. A written record to refer to at home is more reliable.

Review your medications with your pharmacist as well as your doctor. Pharmacists are highly trained medication experts and are often more immediately accessible than doctors for questions about day-to-day medication management. They can advise on timing, interactions, side effect management, and practical aspects of medication use.

Medication and Cognitive Change

Cognitive changes, whether due to dementia, the early stages of mild cognitive impairment, or simply the occasional forgetfulness that is common in later life, can create additional challenges with medication management. Systems that reduce the reliance on memory, such as dosette boxes, automatic medication dispensers, and reminders set on phones or smart devices, can be enormously helpful in ensuring medications are taken correctly.

For those supporting a family member with cognitive difficulties, regular involvement in medication management, including checking that the dosette box has been used correctly and attending medical appointments to ensure a full picture of the person's health, is an important contribution to their safety.

Medication safety is not about eliminating the use of medications, which would be neither safe nor desirable. It is about using them as knowledgeably, carefully, and effectively as possible, in partnership with a healthcare team that understands your complete situation. The benefits of well-managed medication for health and quality of life in later years are enormous, and they are well worth the attention and care that safe medication use requires.