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V. Tong et al.
Step 4: Consolidate gained knowledge on
pericarditis and myocarditis and relate it back to
the patient
Step 5: Communicate this data on the adverse
effects of pericarditis and myocarditis to the
patient to address his query
Consider the following when communicating
the information you have found to the patient:
• Acknowledge that the CMI does not contain
detailed information about the incidence of
myocarditis and pericarditis for this vaccine.
• Explain why there is limited information—i.e.,
given that the vaccine has been recently rolled
out, the postmarketing surveillance (with real-
world data) is ongoing, and as updates are
available, the CMI will be updated in due
course where appropriate. Emphasize that at
present, myocarditis and pericarditis cases do
not appear to be common, based on reports
received, though this could change as more
vaccines are used and data is collated.
• Relate the “statistics” to the patient’s own sit-
uation to tailor the risk information being
communicated, e.g., noting that although the
patient is male, cases tend to be observed
more so in males below the age of 40 and after
receiving the second dose of thevaccine [51].
• Communicate the benets versus harms of
COVID-19 vaccination with the possibility of
developing myocarditis and pericarditis, and
compare and contrast against not being
vaccinated.
• State the current clinical guidelines and
recommendations—by consensus, guide-
lines still reinforce that the benefits of
COVID-19 vaccination greatly outweigh
the risks of potential myocarditis and peri-
carditis [51].
7.2 Case Study 2
You are currently working as one of the diabetes educator nurses in a large hospital. A junior colleague at
the hospital approaches you with a query. Your colleague is currently completing a rotation with the
endocrinology team based in the diabetes outpatient
clinic. They have recently heard about the Ozempic®
shortage in the community due to it being increasingly prescribed for the management of obesity. They
ask you to recommend a research paper that outlines
the harms and benets of semaglutide use in the context of obesity and provide details on its place in current local clinical guidelines, as they are unfamiliar
with the evidence supporting this “indication.”
1. How will you respond to this request?
Step 1: Refer to the Ozempic® PI/SPC to verify the approved indications and available clinical trial data from the medicine sponsor for your
specic country/region
• Not all proprietary products containing sema-
glutide are approved for use for weight loss
specically. In Australia, for example,
Ozempic® use in weight management is con-
sidered “off-label” as the proprietary product
Ozempic® is only indicated for use in diabetes
management. The PI/SPC provides informa-
tion on the indication for a specic medicinal
product, as approved by the regulator based on
the data submitted by the sponsor for evalua-
tion. Refer to the Ozempic® PI for clinical trial
data regarding adverse effects.It should also
be noted that weight loss is consistently statis-
tically signicant across various clinical trials
reported as part of the PI [55].
Step 2: Search for clinical updates and seminal papers to understand the available data supporting the use of semaglutide for weight
management
• Look for primary research where possible,
published in reputable journals with a high-
quality study design, e.g., a well-conducted
randomized controlled trial.
• After conducting a literature search, you
nd a paper published in the New England
Journal of Medicine by Wilding etal. enti-
tled “Once- weekly semaglutide in adults
with overweight or obesity” [56]—this trial
is known as the STEP 1 trial, funded by
Novo Nordisk.

17 Information Sources forDrug Safety andCommunicating Risks inPractice
401
Step 3: Extract benet and harm information
for semaglutide from the trial data
• When evaluating the data published by
Wilding etal., you note the following:
– When comparing the group treated with
semaglutide versus the placebo group,
there was a difference of −12.44% (95%
CI, −13.37 to −11.51) body weight change
between baseline weight and after
68weeks, that was statistically signicant
(P<0.001) [56].
– There was an odds ratio of 11.2 (95% CI
8.9–14.2) reported in relation to those who
were able to lose 5% or more of their body
weight (P<0.001) as measured at 68weeks
when comparing between the groups
[56]—this means that those who utilized
semaglutide were about 11 times more
likely than those who were using the placebo to exhibit weight loss of 5% or more
of their body weight at this time point.
– Wilding etal. present a comprehensive pro-
le of side effects experienced, with more
common side effects being gastrointestinalrelated [56]—see the full publication for
further information that can be presented
alongside the benets of semaglutide
treatment.
Step 4: Consult local and international clinical
guidelines
• Internationally, there may be provisional guidance to recommend its use, such as that from
the National Institute for Health and Care
Excellence [57].
• Regulators may have also approved a product
containing semaglutide for use in managing
overweight/obesity in your jurisdiction, as
seen in the United States [58] and more
recently, Australia. Wegovy®, a proprietary
product containing semaglutide that is specically indicated for use in chronic weight management, has recently been approved to be
included in the Australian Therapeutic Goods
Register as of 1 September 2022 [59].
However, it is currently not supplied in
Australia as of yet by the medicine sponsor,
and a clear statement was made in that
Ozempic® and Wegovy® cannot be substituted
for one another given their different approved
indications [59].
• If a medicinal product has not been approved
for managing a specic condition or is not
currently being supplied yet, this may limit its
integration into local treatment protocols and
clinical guidelines for that country or region.
• Clinical guidelines may be updated in the
future, given the recent trend in approvals and
clinical direction. Therefore, it is important to
keep up to date with emerging evidence,
approvals, and clinical guideline updates.
Step 5: Communicate your ndings from the
previous steps and explain the benet and harm
information for semaglutide
7.3 Case Study 3
You are a clinician working in a cardiology
clinic. You receive a safety advisory from the
regulatory authority in your jurisdiction about
an increased risk of bleeding with direct oral
anticoagulants (DOACs). DOACs have been
authorized for indications where Vitamin K
antagonists were previously used. An important
clinical benet of DOACs is that there is less
need for routine monitoring of anticoagulant
activity. The safety advisory states that although
DOACs were expected to be signicantly safer
than previous treatments, major bleeding events,
including events leading to death, also constitute a signicant risk with DOACs, as with
Vitamin K antagonists.
Every couple of weeks you see patients who
use these medicines, but they differ widely in
age, overall health, concomitant medicines, and
adherence. You are concerned about the information received and patients being treated.

402
V. Tong et al.
1. Suggest thebest wayto introducethis safety
advisory in your practice.
Step 1. Consider the extent to which you are
already aware of the risks outlined in the letter
• Ask yourself whether you were already
aware of the risks outlined in the letter and
whether you are taking them into account in
your prescribing and counseling. In some
cases, the emergent safety concerns described
in regulatory warnings have already been
established in clinical communities as precautions or they have been discussed prior to
the emergence of the evidence that would
trigger a regulatory warning. In any case, the
warning may include important new information to update you.
Step 2. Search for additional information on
the emergent risks
• Drug safety advisories and news bulletins
about drug safety are typically short-format
notications that do not allow much background information or information on recommendations. Therefore, detailed information
about the basis for the emergent concerns and
the clinical measures to be taken will most
often be found in the material referred to in the
safety advisory.
• Consult clinical practice guidelines on the use
of DOACs for further recommendations.
Step 3. Consider whether you have patients
for whom this would be a concern
• Go through your list of patients and identify
patients for whom the new contraindications
in the drug safety advisory warning are
relevant.
Step 4. For patients of concern, reconsider
treatment and explain any changes to them.
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Polypharmacy andDeprescribing
AlpanaRajeshMair, MargaretJordan,
andJudyMullan
18
Abstract
Polypharmacy contributes to medicationrelated harm. Medication-related harm
accounts for approximately 9% of hospital
admissions worldwide, and it is estimated that
many of these hospitalisations are preventable. It is therefore important to consider signicant opportunities which can be used to
reduce the burden of medication-related harm.
These opportunities could involve the provision of timely and effective interventions,
which include shared decision-making and a
person-centred approach when undertaking
reviews, where deprescribing may be an outcome as well as starting medications, to ensure
A. R. Mair (*)
Effective Prescribing & Therapeutics Division,
Scottish Government, Edinburgh, UK
Edinburgh Napier University, Edinburgh, UK
e-mail: alpana.mair@gov.scot
M. Jordan
School of Pharmacy, Faculty of Science, Medicine
and Health, University of Sydney, Sydney, Australia
Faculty of Science, Medicine and Health Faculty,
Graduate School of Medicine, University of
Wollongong, Wollongong, Australia
J. Mullan
Faculty of Science, Medicine and Health Faculty,
Graduate School of Medicine, University of
Wollongong, Wollongong, Australia
optimised treatment. Strategies to avoid inappropriate polypharmacy, as a whole system
and integrated approach by various members
of the healthcare team, could also be considered as important interventions to reduce medication-related harm.
This chapter will discuss why polypharmacy is on the increase and why it is important to consider appropriate and inappropriate
polypharmacy as well as the signicance of
deprescribing. It will describe why a personcentred prescribing and management of multimorbidity approach are important to consider
during all stages of the medication management process.
Keywords
Polypharmacy · Deprescribing · Medicationrelated harm · Person-centred approach
Appropriate polypharmacy · Inappropriate
polypharmacy
Learning Objectives
• Understand why prevalence of polypharmacy is
increasing and understand when polypharmacy
can be appropriate and when it is inappropriate.
• List the medicines that have been identied to
cause most harm and how to prioritise patients
for review.
© The Author(s), under exclusive license to Springer Nature Switzerland AG 2024
J. Jose et al. (eds.), Principles and Practice of Pharmacovigilance and Drug Safety,
https://doi.org/10.1007/978-3-031-51089-2_18
405

406
• Understand how to involve patients in discussions about their medicines and take a personcentred approach to medication review.
• Identify the barriers and enablers that need to
be considered when implementing polypharmacy reviews and supporting resulting
deprescribing.
• Describe the economic benets of undertaking the review of patients to ensure appropriate polypharmacy and deprescribing.
Key Points
• Polypharmacy (use of multiple medica-
tions) can cause medication-related
harm. However, it is important to consider not only the number of medicines
an individual is taking but also if polypharmacy is appropriate or inappropriate. Therefore, considering if the
therapeutic objectives are being
achieved as well as the benets, harms
and applicability of numbers needed to
treat are important.
• Causes of polypharmacy include
increase in multimorbidity, receiving
care from multiple prescribers without
adequate integration and the prescribing
cascade, where an adverse event is misinterpreted as a new medical condition
and subsequently prescribed treatment
for it.
• There are some medicines that are
regarded as high-risk medications, that
is, they have an increased risk of causing harm or death when used in error,
e.g. non-steroidal anti-inammatory
drugs. People using these medications
with additional risk factors such as age
and impaired kidney function should be
prioritised for review.
• There are many tools to help identify
patients at risk of inappropriate polypharmacy. Healthcare professionals
involved should take a person-centred
approach to prioritise patients for
review, e.g. people on high- risk medications together with other factors that
A. R. Mair et al.
would predispose the patient to risk, e.g.
frailty.
• People from deprived communities
often present with polypharmacy at a
younger age as they have multi-morbidities at an earlier age and hence more
likely to be needing medication review.
• The ‘7-steps’ approach not only takes a
person- centred approach to review
appropriate polypharmacy, asking ‘what
matters to the person’, but also considers numbers needed to treat and whether
the person is likely to benet from the
treatment considering individual circumstances. Deprescribing should be
taken in this context once the medications are reviewed.
• As part of a person-centred approach,
shared decision-making tools should be
used to support the person make decisions about their medication.
• Medication safety indicators are available in many countries and can be used
not only to prioritise patients for review
but also to support improvement.
• Implementing programmes to address
inappropriate polypharmacy and resulting deprescribing should take a systems
approach that has a multidisciplinary
approach with clinical and policy leadership, and patient and public involvement. It needs to address medication
safety culture, using change management tools and data to drive change.
1 Introduction
This chapter will consider why polypharmacy is
increasing and the need to focus on appropriate
and inappropriate polypharmacy and causes of
medication-related harm. It will explain why
person- centred prescribing and management of
multimorbidity are important to consider at initiation of prescribing and as part of regular medication reviews and in all stages of medication
management. The role of shared decision-making

18 Polypharmacy andDeprescribing
407
tools will be considered to support patients and
prescribers to make decisions about the benets
and potential harms of medicines.
Medication-related harm accounts for approximately 11% of unplanned hospital admissions in
the UK, of which 50% are avoidable and with the
majority occurring in older patients with polypharmacy, use of multiple medicines [1]. If this
was extrapolated across the EU, it would result in
8.6M admissions each year. There are, therefore,
signicant opportunities to reduce this burden by
timely and effective interventions. Strategies
used to address medication-related harm that
include a person-centred approach will be considered as these have been shown to address up to
15% of harm [2].
Actions that can be taken by various members
of the healthcare team, as well as mechanisms
and strategies to avoid inappropriate polypharmacy, will be discussed in this chapter. Various
tools to assess potentially inappropriate medication (PIM) use, approaches and steps, and challenges for deprescribing will be covered.
The importance of a whole system and integrated approach will be considered to ensure that
inappropriate polypharmacy is addressed as
patients access care in all care settings. This is
highlighted by WHO in their Global Patient
Safety technical report, Medication Safety in
Polypharmacy [3].
tinely prescribed, for instance after an acute myocardial infarction. Polypharmacy is the concurrent
use of multiple medications, and while polypharmacy is often dened as routinely taking a minimum of ve medicines [6], it is being more
frequently suggested that the emphasis should be
on evidence-based and appropriateness of the
prescription rather than the number [3, 7]. All
medications that a patient is using should be considered when reviewing polypharmacy for its
appropriateness, including traditional medications, complementary preparations as well as
those purchased by the patient over the counter.
Despite increasing multimorbidity, most medical
research, clinical guidelines and contractual
agreements (such as pay-for-performance initiatives such as the General Medical Contract
(GMS) that sets out what GPs are tasked and paid
to deliver on for reimbursement) are focused on
the management of single disease states [8]. In
these multimorbid patients, referrals to specialists and individually treating each condition inevitably lead to the use of multiple medications,
that is, polypharmacy [9]; the risks and benets
of which are largely unproven and often
unpredictable.
It is important to note that all polypharmacy is
not inappropriate per se (see below), and it is
often benecial. See Boxes 18.1 and 18.2 [7].
2 Polypharmacy,
Multimorbidity, Adherence
andtheScale ofMedicationRelated Harm
It has been estimated that the global population
aged over 65years will double from 8% in 2010
to 16% in 2050 due to advances in disease prevention, healthcare, education and socioeconomic circumstances [4]. Along with this,
there is an increase in multimorbidity, which is
dened by the World Health Organization as the
‘co-occurrence of two or more chronic medical
conditions in one person’ [5]. Patients with multimorbidity may require medicines to treat each
condition, which can lead to polypharmacy. Also,
for some conditions, several medicines are rou-
Box 18.1 Appropriate Polypharmacy
Appropriate polypharmacy is present,
when:
(a) all drugs are prescribed for the purpose
of achieving specic therapeutic objectives that have been agreed with the
patient,
(b) therapeutic objectives are actually
being achieved or there is a reasonable
chance they will be achieved in the
future,
(c) drug therapy has been optimised to
minimise the risk of adverse drug reactions and,
(d) the patient is motivated and able to use
all medicines as intended.
From: Polypharmacy Guidance,
Realistic Prescribing Third Edition [7].

408
A. R. Mair et al.
An example of appropriate polypharmacy is for
a 65-year-old male patient who has developed atrial
brillation on the background of cardiac disease
and type 2 diabetes, for which he is prescribed lipidlowering therapy, an angiotensin II receptor blocker
(ARB), an antiplatelet agent and two oral hypoglycaemic medicines, to reduce the further risk of cardiovascular events and manage blood glucose. With
the additional diagnosis, rate control is commenced,
and after considering the potential benets and risks
of anticoagulant therapy, the patient commences
apixaban and ceases aspirin. Blood pressure, kidney
function and blood glucose are monitored regularly.
The patient understands the purpose of the medicines and the degree of monitoring required.
Polypharmacy, however, becomes inappropriate when the risks of multiple medications begin
to outweigh their potential benets for an individual patient, especially as the person ages [7].
Box 18.2 Inappropriate Polypharmacy
Inappropriate polypharmacy is present,
when one or more drugs are prescribed that
are not or no longer needed, either because
(a) there is no evidence-based indication,
the indication has expired, or the dose
is unnecessarily high,
(b) one or more medicines fail to achieve
the therapeutic objectives they are
intended to achieve,
(c) one or the combination of several drugs
cause unacceptable adverse drug reactions (ADRs), or put the patient at an
unacceptably high risk of such ADRs,
or because
(d) the patient is not willing or able to use
one or more medicines as intended.
Inappropriate polypharmacy is also
referred to as ‘problematic’ or
‘unacceptable’.
From: Polypharmacy Guidance,
Realistic Prescribing Third Edition [7].
patient moves across different healthcare settings, that is, through transitions of care. The
increased risk of harm is not always offset by
increased benets, and for many preventive
medicines, such benets may never be realised
due to a shortened life expectancy. The risk of
harm is generally higher in older people with
multimorbidity than in younger patients due to
pharmacokinetic factors, such as reduced ability
to clear drugs (e.g., due to kidney and/or liver
impairment) and pharmacodynamic factors such
as increased vulnerability to drugs’ adverse
effects (due to general frailty, and drug–drug
and drug–disease interactions) and medication
burden [8, 10, 11].
2.1 Causes ofInappropriate
Polypharmacy
Poor coordination of care increases the likelihood of polypharmacy and medication-related
harm. For instance, patients with multimorbidity often receive care from multiple prescribers and have complex medication regimen
[12]. This can result in communication breakdowns and fragmentation of care [9, 12]. There
is also at times a reluctance by primary care
prescribers to alter their patients’ medicine
prescribed during a hospital admission or by a
medical specialist [13], which highlights a
need to change the medical culture and to
improve the communication between all levels
of care [13]. However, care transitions can
also present an opportunity to identify inappropriate polypharmacy and potentially deprescribe [14, 15].
A case to illustrate how a person-centred
approach could be taken to consider appropriate polypharmacy is discussed as Case 1 in
Sect. 9.
2.2 Prescribing Cascade
The appropriateness of polypharmacy should
be considered at every point of initiation of a
new treatment for the patient and when the
A ‘prescribing cascade’ arises when an adverse
drug event occurs that is misinterpreted as a new
medical condition, and a subsequent therapy pre-

18 Polypharmacy andDeprescribing
409
scribed for treatment [16]. If a medicine is used, it
may contribute to additional adverse effects, for
instance, initiating a diuretic for oedema associated with a dihydropyridines may put the patient
at risk of uid depletion. Some examples of prescribing cascades are illustrated in Box 18.3.
To have a better understanding of the impact
of prescribing cascade, please refer to Case 2 in
Sect. 9.
Box 18.3 Examples of Prescribing Cascades
Subsequent
Initial medicine
Cholinesterase
inhibitor
Cholinesterase
inhibitor
Non-steroidal
antiinammatory
drug
Dihydropyridine
calcium channel
blocker
Gabapentinoid Peripheral
Adverse
effect/s
Nausea,
vomiting,
abdominal
pain, dyspepsia
Bradycardia,
heart block
Hypertension Antihypertensive
Ankle oedema Diuretic
oedema, heart
failure
medicine/s or
device
Proton pump
inhibitor;
antacid
Pacemaker
insertion
Diuretic;
angiotensin
receptor blockers
3 Medicines Implicated in
Causing Harm: ‘High-Risk’
Medicines
High-risk medicines are those that have an
increased risk of causing significant patient
harm or death if they are misused or used in
error [17, 18]. Errors with these medicines are
not necessarily more common than with other
medicines, but the consequences of any misadventure can be more devastating [17, 18].
Medicines considered ‘high-risk’ vary
between hospitals and other healthcare settings, such as primary and aged care, and
depend on the context and the clinical conditions treated [17, 18].
An Australian mnemonic which has been
widely used to raise awareness of medicines
identied as high risk in acute care is ‘A-PINCH’,
based on analyses of incident data and literature
[18]. See Box 18.4. ‘O’ may be added to
A-PINCH to consider any other medications that
have been identied as being relevant for the
organisation or setting.
Box 18.4 A-PINCH—Medicines Identied as
High Risk in Acute Care
A Anti-infectives
P Potassium and other electrolytes
I Insulin and other hypoglycaemic agents
N Narcotics and other sedatives
C Chemotherapeutic agents
H Heparin and anticoagulants
N = narcotic, used for the purpose of the pneu-
monic. This refers to opioid medicines.
Although some medicines are recognised as
‘high risk’ regardless of context, such as anticoagulants and opioid agents, there are many others
in common usage that are responsible for potential adverse events due to the changing clinical
condition of the patients for whom they are prescribed, concomitant medicines and deciencies
in the medication management pathway.
Empirical research has identied medications
commonly associated with adverse drug reactions (ADRs) and medication-related harm [19–
21]. Some of these can be found in Table 18.1.
Note that this list is not exhaustive. Please refer to
Case 1 and 2 in Sect. 9 to note the use of high-risk
medications.
If we consider the high-risk medications
in the cases of Ms AK and Mr PC discussed
in Sect. 9
In Case 1, Ms AK is taking aspirin, beta
blockers, ramipril and zopiclone.
In Case 2, Mr PC is taking diclofenac,
ramipril, bendroumethiazide and
glibenclamide
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