Background
Patients with advanced disease approaching the end of life often suffer from symptoms that impair their own and their families quality of life [
1,
2]. Alleviation of these symptoms, through a multi-dimensional and inter-professional palliative care approach, includes pharmacotherapy as an essential component.
Common symptoms in the terminal phase are pain, nausea and vomiting, agitation or restlessness and dyspnoea [
3]. Pro re nata (PRN) prescription of drugs, as recommended in clinical pathways aim to cover these common symptoms, as well as to provide stand-by medication for possible emergency situations [
4,
5]. Analgesics, antiemetics, sedatives and anxiolytics titrated to the individual patient’s level of need should be prescribed and any medication, which is not essential for symptom control, discontinued. Drugs administration is preferably via subcutaneous routes, and the amount of patient manipulation related to medication delivery, reduced to a minimum. In severe cases, where patients experience an unbearable and/or refractory symptom burden, palliative sedation therapy may be considered as an important and necessary therapeutic intervention [
6,
7].
One drug widely used in the palliative care setting is levomepromazine in Europe and methotrimeprazine in the United States (trade names Neurocil, Nozinan, Nosinan or Levoprome). This aliphatic phenothiazine is a neuroleptic with low antipsychotic potency first used in psychiatry for the treatment of schizophrenia [
8]. Levomepromazine acts as an antagonist at histamine type 1, muscarinic-cholinergic, dopaminergic 2, alpha-1 adrenoceptor and 5HT-2 receptors [
9,
10], and due to a half-life of 15–30 hours makes once daily administration practicable. It can be administered subcutaneously, intravenously or orally. Known adverse drug effects include postural hypotension, skin irritation, drowsiness, dry mouth, dystonia, neuroleptic malignant syndrome, Parkinsonism and epilepsy by lowering the seizure threshold [
11]–[
13]. As a result of the potential impact of some of these side effects on safe mobilisation there are recommendations to best avoid its use in ambulatory palliative care patients [
14]. Compared to the cost of some alternative drugs Levomepromazine is a cost effective option (e.g. in the UK 7 tablets with 24 mg of oral levomepromazine costs £1.69;
http://www.cks.nhs.uk/) [
15]. Table
1 presents the essential pharmacokinetic data of the drug. In palliative care, levomepromazine is predominantly used for the treatment of nausea and vomiting, and for severe delirium or agitation at the end of life. However, its effectiveness is mainly based on anecdotal evidence [
16,
17]. In clinical practice, its use as a sedative has also become more frequent as part of palliative sedation therapy, and the analgesic properties of levomepromazine are described in some of the studies [
18,
19]. For most of the above indications the clinical use of levomepromazine is off-label by application in many countries [
20] and published evidence is scarce.
Table 1
Pharmacokinetic data of levomepromazine[
21,
22]
Bioavailability | 20-40% p.o. |
Onset of action | 30 min. |
Maximum serum concentration (tmax) | p.o.: 2–3 h |
i.m.: 30–60 min |
Half life (t1/2) | 15-30 h |
Duration of action | 8 h |
The use of levomepromazine for symptom control in palliative care has been considered in several published systematic reviews concerning individual symptoms, such as the treatment of nausea and vomiting [
23], breathlessness [
24] or sedation [
25]. However, to date no systematic review has tried to collate the overall evidence base for using this interesting drug in the palliative care setting. The rationale for this investigation is levomepromazine’s broad-range applicability. Potentially, its properties are particularly beneficial in the treatment of several and diverse symptoms in end-of-life care. This review therefore aims to summarise and update the available evidence for the use of the ‘all-rounder’ levomepromazine/methotrimeprazine for patients in the palliative care setting, with a special focus on its utility in symptom control at the end-of-life. The report follows the reporting standard of the PRISMA-Statement. Table
2 presents our research question according to the PICOS approach [
26].
Table 2
PICOS approach in our systematic review according to the PRISMA guideline[
26]
P | patients | patients at the end of life |
I | intervention | pharmacological treatment with levomepromazine |
C | comparison | none |
O | outcome | symptom control with levomepromazine |
S | study design | randomized controlled trials, prospective trials, cohort studies, case series, case reports, systematic reviews |
Methods
A review protocol was developed and the trial was registered with the PROSPERO network for systematic review registration (registration number: CRD42012002390).
Study characteristics
Publications that met the inclusion criteria were those that 1) involved individuals treated in the palliative care setting, 2) included adults, 3) evaluated pharmacological treatment of symptoms at the end of life with levomepromazine and 4) were characterized as randomized controlled trials, prospective trials, cohort studies, case series or case reports. Systematic reviews were also included but were primarily used for hand searches of references. Non-systematic or narrative reviews were excluded, but collected as a separate category as proof of existing clinical knowledge/practice. Our systematic review was limited to studies published in English or for which English abstracts were available. The period of review was from 1980 to April 2012.
Search strategy
The following five computerized online databases were searched in the second week of April 2012: Medline (1946 to April week 2 2012), Embase (1980 to 2012 Week 15), The Cochrane Library, PsychInfo (1806 to April week 3 2012), Ovid Nursing (1946 to April week 2 2012).
The automated search was conducted using two main components: The first component included several search terms for identification of literature relevant to palliative care, based on a master search strategy developed for that specific purpose [
27], enlarged by some additional search terms. The second component contained the search terms for levomepromazine.
Search terms of the automatic search are the following:exp advance care planning/OR exp attitude to death/OR exp bereavement/OR death/OR hospices/OR life support care/OR palliative care/OR exp terminal care/OR terminally ill/OR palliat*.tw. OR hospice*.tw. OR “terminal care”.tw. OR terminally ill patient.mp. or exp terminally ill patient OR exp terminal care/OR palliat*.tw. OR hospice*.tw. OR end of life care.mp. OR EOL care.mp. OR palliative therapy.mp. or palliative therapy/OR terminally ill patient.mp. or terminally ill patient/AND levomepromazine.mp. or levomepromazine/OR methotrimeprazine.mp. OR neurocil.mp. OR nozinan.mp. OR levoprome.mp.
Table
3 shows the full electronic search strategy as performed in Embase.
Table 3
Electronic search strategy performed in Embase
1 | exp advance care planning/ | 448482 |
2 | exp attitude to death/ | 8692 |
3 | exp bereavement/ | 5150 |
4 | death/ | 92098 |
5 | hospices/ | 6053 |
6 | life support care/ | 77969 |
7 | palliative care/ | 40548 |
8 | terminal care/ | 20376 |
9 | terminally ill/ | 5136 |
10 | palliat$.tw. | 54515 |
11 | hospice$.tw. | 8617 |
12 | terminal care.tw. | 1478 |
13 | physician-patient relations/ | 74874 |
14 | prognosis/ | 385402 |
15 | quality of life/ | 193187 |
16 | survival rate/ | 119505 |
17 | treatment outcomes/ | 0 |
18 | attitude to health/ | 70459 |
19 | palliative care.mp. | 17299 |
20 | exp terminal care/ | 40896 |
21 | exp terminally ill patient/ | 5298 |
22 | terminally ill.mp. | 8305 |
23 | exp palliative therapy/ | 52501 |
24 | EOL care.mp. | 307 |
25 | 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10 or 11 or 12 or 13 or 14 or 15 or 16 or 17 or 18 or 19 or 20 or 21 or 22 or 23 or 24 | 1405466 |
26 | levomepromazine.mp. | 4195 |
27 | levomepromazine/ | 4103 |
28 | methotrimeprazine.mp. | 127 |
29 | methotrimeprazine/ | 4103 |
30 | neurocil.mp. | 206 |
31 | nozinan.mp. | 480 |
32 | levoprome.mp. | 34 |
33 | 26 or 27 or 28 or 29 or 30 or 31 or 32 | 4223 |
34 | 25 and 33 | 499 |
35 | limit 34 to english language | 364 |
36 | limit 35 to yr = “1980 -Current” | 363 |
Study selection
After conducting the search in all databases and de-duplication, as a first step, titles and abstracts of identified studies were screened for relevance to the topic and studies considered being not relevant excluded. In a second step, full texts were sought for all studies, which appeared to meet the inclusion criteria. Conference abstracts were also included. Two independent researchers then separately reviewed all retrieved papers for relevance. Where a difference in results occurred, data was discussed and the discussion recorded. Final decisions were strictly based on adherence to the inclusion and exclusion-criteria. If agreement could not be reached, full-text analysis using a relevant quality-instrument was performed. Where there was still no agreement after thorough discussion, the study was included into the search and its relevance discussed in the publication.
Data extraction and assessment of studies
Relevant studies were extracted into a qualitative synthesis table and categorised according to the following items: author, title, year of publication, journal, study design, indication for levomepromazine, study population, setting, number of study participants, number of patients under treatment, mean dose, dose range, application, measurement of effectiveness, reported adverse effects, remarks, conclusion, main results from the quality analysis process, further comments.
Studies were critically appraised and the evidence was graded based on the determinants for quality of evidence published by the Oxford Centre for Evidence-Based Medicine Levels of Evidence: Level 1: evidence from a systematic review of RCT; Level 2: evidence from a RCT; Level 3: evidence from a non-randomized controlled cohort studies Level 4: evidence from case-series or case–control or historically controlled studies Level 5: expert opinion [
28]. Quality assessments were undertaken by using quality check-lists adherent to the standards gathered by the EQUATOR network [
29].
Discussion
This review aimed to summarise and update the available evidence for the use of the “all-rounder” levomepromazine/methotrimeprazine for patients in the palliative care setting with a special focus on symptom control at the end of life.
Levomepromazine is a drug with broad-range applicability and effectiveness in the treatment of symptoms in end-of-life care had already been demonstrated in a study by Oliver et al. in 1985 [
41]. However, since that study, which looked at the use of this particular drug for confusion and agitation, nausea and vomiting and pain as three main indications for use, no other work has considered levomepromazine in palliative care treatment 'as a whole’. In that early work by Oliver et al., sedation was reported as a noted side effect of levomepromazine, whereas subsequent studies in the 1990
es turned that side effect into a benefit and started to realize the value of the drug as a part of treatment where sedation was indicated and/or intended [
39,
40]. Further researchers began to focus on the use of the drug in specific symptom control for individual symptoms in palliative care patients and an overall perspective on the multifaceted applicability of levomepromazine stepped into the background.
Multiple studies showed that levomepromazine, due to its broad-spectrum action on receptors involved in emesis, is effective as a first-line treatment for intractable patho-physiological causes and as a general second-line option for treatment of nausea and vomiting [
13,
47]–[
51]. Dose ranges vary slightly at the lower value but are stable in the upper; only one study indicated doses up to 30 mg levomepromazine per day, all other studies stated an upper value of no more than 25 mg per day.
There exist a variety of non-systematic reviews and narrative articles recommending levomepromazine for nausea and vomiting in palliative care patients, which should be recognised and considered in practice, although they are mostly based on anecdotal evidence or expert opinion [
12,
16,
56]–[
58,
65,
66]. The two systematic reviews on nausea and vomiting included in our review provide very little information or data on dosage, which leaves them short on clinical applicability [
23,
52]. However, an expected Cochrane review evaluating the efficacy of levomepromazine for the treatment of nausea and vomiting in palliative care patients may in future, when completed and published, provide some useful guidance towards establishing recommendations for clinical practice [
67]. At present, we consider the research foundation for evidence-based recommendations on dosage and route of administration in nausea and vomiting to be very small.
There are a large number of papers dealing with the use of levomepromazine in palliative sedation, most of them recommend its use in combination with midazolam or as a second line drug for continuous sedation if midazolam is ineffective [
25,
30]–[
32,
39,
42]. Similar data can be found in non-systematic reviews [
40,
46,
68,
69]. Again, we could not identify any consensus regarding dosage of levomepromazine for palliative sedation in the included papers; mean doses and dose ranges varied considerably between studies and we found no evidence other than clinical expertise to underpin the choice of dosage and/or level.
In all the above named papers the most common indication for the use of levomepromazine as a sedative agent is in relation to terminal restlessness, especially where this occurs in combination with neuro-psychological symptoms such as confusion, anxiety, agitation or delirium. In the framework for the use of sedation in palliative care published by the European Association for Palliative Care (EAPC, one of the most recent and relevant papers with significant clinical implications), levomepromazine is recommended for sedation of delirious patients as a first line choice, based on the rationale that benzodiazepines, as an initial treatment for delirium, may worsen rather than improve symptoms [
7]. However, neither the systematic reviews, nor the studies on palliative sedation, included in this review provide robust evidence, other than clinical expertise for the use of levomepromazine. Papers either provide no information about underlying evidence for recommendations, or recommendations are limited to expert opinions, or findings are based on the same small group of low quality and low evidence studies.
Delirium was considered as a category of its own for the use of levomepromazine in palliative care patients in the present work. Unfortunately, papers that dealt with this indication were scarce and the reported data was highly heterogeneous. The spectrum of data ranged from levomepromazine being ineffective in a case study [
58], or the statement that combined treatment of neuroleptics and benzodiazepines are often utilized to control delirium based on data from a retrospective chart review [
56] to a systematic review, that included only two studies on levomepromazine, one of which was the case report named above, but nevertheless recommending neuroleptic medications in general as a first or second line pharmacological treatment of delirium [
57]. As stated in a work by Caraceni et al. and also mentioned in the EAPC-framework, if control of delirium fails, sedation can be necessary and in these cases levomepromazine may be a choice [
7,
70]. Thus, it seems that some authors see a smooth transition between treatment of delirium and palliative sedation therapy, but to our knowledge there exist no studies as yet which provide data on dosage levels for delirium versus sedation, or differential co-factors/co-morbidities which would influence the choice of medication, or the meaning of patho-physiological causes of delirium in this context.
A Chochrane review conducted in 2010 about anti-psychotics for acute and chronic pain in adults, proposed levomepromazine for pain within the first 72 hours after acute myocardial infarction [
19], and in chronic non-cancer pain management levomepromazine may be used supplementary to other drugs [
71]. A couple of studies in the 1960es and 1970es reported levomepromazine to be effective in treatment of pain in cancer patients [
72]–[
74], and there even seems to be an accepted conversion scale for morphine to levomepromazine of 1.5:1 [
75]. Our review included one case report published in 1987, and one study from 1985 underlining these previous findings [
41,
59], but regrettably there seems to be absolutely no later published research on the use of levomepromazine for pain in palliative care or cancer patients.
Many studies mentioned side effects of levomepromazine, which mainly focused on sedation and hypotension, but skin reactions and extrapyramidal side effects were also reported [
13,
44,
58,
59]. Incidences and co-factors of these side effects are not studied in detail, and where such side-effects were reported no specific data for patients at the end of life seems to exist. The above-mentioned Chochrane review on the use of levomepromazine for the treatment of nausea and vomiting will also evaluate associated minor and serious adverse events [
67]. Until then it seems that Levomepromazine needs to be considered for use in accordance to expert clinical knowledge and by establishing an indication for its use on ethical considerations, weighing the benefit and harm for an individual patient in clinical practice. Hypotension for example, which is a reported side-effect of Levomepromazine, is unlikely to be a problem in bed-bound patients with a low palliative performance status, and/or a situation in which active symptom control is the only means of providing quality at the end of life [
76]. What is more, sedation as a side-effect could be potentially useful and therefore incorporated in a holistic pharmacological regimen of end-of-life/palliative care in some patients.
Limitations
Because of the limitations of available studies the overall evidence for the use of levomepromazine resulting from the present review remains weak. Findings mainly based on retrospective study designs, lack of control groups, missing randomisation and small sample sizes all lead to a weak level of evidence. More homogeneous prospective studies on larger number of patients, and including measurement and reporting of outcome parameters, should be performed to provide more reliable data.
Our systematic review followed the steps considered good practice including the pre-investigation registration of our review protocol, adherence to the reporting standards and rigorous recording of decision pathways during the review process. However, some limitations apply. We did not perform any meta-analysis as the heterogeneous and low-quality data of the original studies included simply did not allow such a step, and we did not apply risk-of-bias assessment tool across studies. What is more, we limited our review to published data, deliberately excluding grey literature and non-published expert opinion, introducing a publication bias to our review.
Competing interests
All authors declare that they have no competing interests.
Authors’ contributions
ID and CS carried out the systematic literature review, coordinated the sequence alignment and drafted the manuscript. AS and IL participated in the sequence alignment and in the design of the review and helped to draft the manuscript. All authors read and approved the final manuscript.