Polypharmacy in Singapore: Taking Many Medicines Safely

Written & reviewed by the BestDoctors.sg editorial team · Last updated 24 Aug 2026 · General information, not medical advice

The key safety rule: the fix is review, not random stopping. Some medicines must be reduced gradually, so never stop or change one on your own – raise it with your doctor or pharmacist.

What polypharmacy actually means

Polypharmacy simply means being on many medicines at the same time. The widely quoted figure is “five or more,” but clinicians stress the number matters less than whether each medicine is still appropriate – genuinely needed, working, and safe for that person now. A person on seven essential, well-monitored medicines may be fine; a person on four, two of which are causing harm, may not be.

Why it’s common in older people

• Multiple long-term conditions – high blood pressure, diabetes, heart disease and arthritis often coexist, each with its own medicine(s);
• Multiple prescribers – a GP plus one or more specialists may each add medicines without anyone holding the full picture;
• Prescribing cascades – a drug’s side effect is mistaken for a new problem and treated with yet another drug.

Why it matters

Every added medicine adds risk: more side effects, more chance of harmful interactions, and dangers that hit older people hardest – falls (from dizziness, low blood pressure or sedation), confusion or delirium, kidney strain, and low blood sugar or blood pressure. There’s also a practical and financial burden that worsens adherence, and it all feeds into more (sometimes preventable) hospital admissions.

Appropriate vs problematic polypharmacy

Appropriate polypharmacy = many medicines that are each indicated, effective and safe for the person, with benefits clearly outweighing risks – the goal is not the shortest possible list. Problematic polypharmacy = medicines that are unnecessary, duplicated, high-risk, or whose harms now outweigh benefits (for example a drug started years ago for a reason that no longer applies). A review keeps the first and safely trims the second.

Higher-risk medicine types in older adults

Some groups deserve extra scrutiny because their harms rise with age: sedatives and sleeping tablets (falls, confusion, dependence); strong painkillers / opioids; certain older antihistamines and other “anticholinergic” medicines (confusion, dry mouth, constipation); some blood-pressure and diabetes medicines that can cause dangerous lows; and blood thinners. This is background awareness only – never a signal to stop any of these yourself.

The solution – review, deprescribing and good habits

• Medication review with a doctor or pharmacist: is each medicine still needed, working, safe, and in line with the person’s goals?
• Deprescribing – the planned, supervised, usually gradual stopping or dose-reduction of medicines that are no longer beneficial;
• Keep an up-to-date medicine list and carry it to every appointment;
• Use one regular pharmacy so a single pharmacist can check for interactions;
• Do a “brown bag” review – bring all your medicines, including supplements, traditional remedies and over-the-counter products;
• Never stop or change a medicine on your own – let the professional adjust it.

In Singapore, pharmacist-led medication review and reconciliation are available through polyclinics and hospitals, and community pharmacists can advise on interactions.

How a medication review works

A medication review is a structured conversation, not just a quick glance at a list. The doctor or pharmacist goes through every medicine and asks, for each one: is there still a clear reason for it; is it actually working; is the dose right for the person’s age and kidney function; is it causing side effects; does it interact with anything else; and does it still fit what matters to the person now. They also look for gaps (a beneficial medicine that’s missing), duplications (two drugs doing the same job), and “prescribing cascades” where one drug is treating another drug’s side effect. To get the most from a review, bring everything – prescription medicines, inhalers, creams, eye drops, plus supplements, vitamins, traditional remedies and anything bought over the counter – in a bag (the “brown bag” review), along with an up-to-date list of doses. It helps to note any problems you’ve noticed (dizziness, falls, drowsiness, poor appetite, difficulty managing the schedule) and any medicines you sometimes skip. Where a medicine is to be stopped or reduced, this is usually done gradually and one change at a time, with a plan to monitor how the person responds. Reviews are worth repeating periodically, and especially after any hospital stay or big change in health, because the right medicines for a person can change over time.

When to see a doctor or pharmacist

Seek a review if you develop new symptoms after a medicine change, feel dizzy or have falls, feel more confused, take many medicines, or find your regimen hard to manage. A geriatrician or pharmacist can help.

Related healthy-ageing topics

• Geriatric syndromes
• Falls in older adults
• Hip fracture
• Frailty
• Delirium (sudden confusion)
• Pressure injuries (bedsores)
• Malnutrition in older adults
• Dizziness & balance
• Caregiver burnout
• Sarcopenia (muscle loss)
• Dementia & memory loss
• Geriatricians in Singapore
• Polypharmacy and Medication Review for Seniors in Singapore

Sources

• NHS inform — polypharmacy: the “5 or more” convention, appropriate vs problematic polypharmacy, medicine-list / one-pharmacy advice.
• Peer-reviewed Singapore study (PMC) — pharmacist-initiated deprescribing in hospitalised older adults; high physician acceptance of suggestions.
• AHRQ — “brown bag” medicine review method.
• HealthHub Singapore / AIC — medication safety and community services (SG context).