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ORIGINAL ARTICLE
Year : 2016  |  Volume : 19  |  Issue : 4  |  Page : 472-477
 

A double-blind, randomized, controlled trial to compare the efficacy and tolerability of fixed doses of ropinirole, bupropion, and iron in treatment of restless legs syndrome (Willis-Ekbom disease)


1 Department of Pharmacology, Himalayan Institute of Medical Sciences, Dehradun, Uttarakhand; Department of Pharmacology, TMMC and RC, Moradabad, Uttar Pradesh, India
2 Department of Pharmacology, Himalayan Institute of Medical Sciences, Dehradun, Uttarakhand, India
3 Department of Psychiatry and Sleep Clinic, Himalayan Institute of Medical Sciences, Dehradun, Uttarakhand, India
4 Department of Community Medicine, TMMC and RC, Moradabad, Uttar Pradesh, India

Date of Submission13-Jul-2016
Date of Decision04-Sep-2016
Date of Acceptance06-Sep-2016
Date of Web Publication21-Nov-2016

Correspondence Address:
Ravi Gupta
Department of Psychiatry and Sleep Clinic, Himalayan Institute of Medical Sciences, Swami Ram Nagar, Jolly Grant, Dehradun - 248 016, Uttarakhand
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0972-2327.194424

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   Abstract 

Background: We aimed to compare the efficacy of fixed doses of bupropion and ropinirole and iron alone for the treatment of restless legs syndrome (RLS) and to look for the tolerability of these medications. Materials and Methods: Patients diagnosed with RLS were randomly divided into three groups with thirty patients in each group (Group A: Bupropion [300 mg/day], Group B: Ropinirole [0.25-0.5 mg/day], and Group C: Oral iron [150 mg elemental iron] along with folic acid [500 μg]). Each participant was then assessed for severity of RLS, as well as RLS-related quality at the baseline, and thereafter, every 14 th day till 6 weeks based on the International Restless Legs Scale (IRLS) severity rating scale and Restless Legs Syndrome Quality of Life (RLSQoL) Questionnaire, respectively. Results: IRLS scores differed significantly from baseline visit to last (F = 4.85; P = 0.01). The interaction between the time x treatment group was significant (F = 10.37; P < 0.001) showing an improvement with the therapy in all the groups. Pair-wise comparison depicted that ropinirole group differed from other two groups in IRLS score (F = 7.06; P = 0.001), which were comparable to each other. Regarding quality of life of these cases, within each group scores differed among all the four visits (F = 5.12; P = 0.002). Unlike IRLS, there was no significant difference among the RLSQOL scores between groups at any point of time (F = 1.2; P = 0.28). Conclusion: RLS severity decreased across time in all three groups; however, the ropinirole treatment was better than the bupropion and iron-folate therapy. Moreover, RLS-related quality of life although improved among all groups, it was comparable among three groups.


Keywords: Bupropion, efficacy, restless legs syndrome, ropinirole, tolerability, Willis-Ekbom disease


How to cite this article:
Vishwakarma K, Kalra J, Gupta R, Sharma M, Sharma T. A double-blind, randomized, controlled trial to compare the efficacy and tolerability of fixed doses of ropinirole, bupropion, and iron in treatment of restless legs syndrome (Willis-Ekbom disease). Ann Indian Acad Neurol 2016;19:472-7

How to cite this URL:
Vishwakarma K, Kalra J, Gupta R, Sharma M, Sharma T. A double-blind, randomized, controlled trial to compare the efficacy and tolerability of fixed doses of ropinirole, bupropion, and iron in treatment of restless legs syndrome (Willis-Ekbom disease). Ann Indian Acad Neurol [serial online] 2016 [cited 2019 Dec 7];19:472-7. Available from: http://www.annalsofian.org/text.asp?2016/19/4/472/194424



   Introduction Top


Restless legs syndrome (RLS), also known as Willis-Ekbom disease, is characterized by an irresistible urge to move the legs, which may begin or worsen during periods of rest or inactivity and often adversely affects sleep. [1],[2] Alteration in the dopamine and/or iron metabolism in brain have been suggested as the underlying mechanism of this disease. [2] Disruption of central and subcortical dopaminergic pathway in RLS has been supported by clinical observations which showed alleviation of symptom with dopaminergic drugs and precipitation or exacerbation of RLS by dopamine antagonist. [3] The most frequently used drugs in RLS are dopamine agonists with the highest level of evidence. [4] The nonergot derived dopamine agonists (NEDAs) are the mainstay of the treatment of RLS. [4] They are highly effective in relieving the symptoms of RLS, but many patients experience some residual symptoms, as well as side effects. Few of them discontinue the treatment due to augmentation of RLS and appearance of impulse control disorders. [4],[5] Among dopamine agonists, NEDAs such as ropinirole, pramipexole, and rotigotine have been approved by the US Food and Drug Administration (FDA). [4] Recently, gabapentin enacarbil has also been approved by FDA for use in RLS. [4],[6] In addition, treatment with iron (oral as well as IV) has also been reported to improve or resolve symptoms of RLS but lacks evidence. [4]

It has been observed in previous studies that RLS is commonly associated with depression though most of the commonly prescribed antidepressant drugs exacerbate the symptoms of RLS. [7],[8] However, there is mounting evidence that bupropion, a selective noradrenergic-dopaminergic reuptake inhibitor, does not exacerbate the symptoms of RLS. [8] In some studies, bupropion has been found to relieve symptoms of RLS with an added advantage of fewer side effects, tolerable adverse drug reactions (ADR) ADRs, and reasonable cost compared with dopamine agonists. [8],[9]

Considering these facts, it would be worthwhile to compare the efficacy of fixed-dose schedules of bupropion and ropinirole and iron alone for the treatment of RLS. To best of our knowledge, no such study is available so far. Thus, the present study was planned to compare the efficacy by assessing the improvement in severity of RLS over 6 weeks of therapy in patients receiving bupropion or ropinirole or oral iron therapy alone. Another aim of the study was to look for the tolerability of these medications among three groups.


   Materials and Methods Top


Participants of either sex aging 18 years or more who attended the sleep clinic were screened for the presence of RLS according to the international RLS study group criteria. [10] Patients with the diagnosis of RLS were explained the rationale of the study and were requested to participate. The study was approved by the Institutional Ethics Committee and a written informed consent was taken from each of the participants.

However, cases with comorbid conditions such as moderate to severe depression, sciatica, osteoarthritis of knee, rheumatoid arthritis, myelopathies and neuropathies, those using opioids/opiates or experiencing its withdrawal, diagnosed of alcohol dependence, those using neuroleptics, antidepressants or antiparkinsonian drugs for at least 1 week, and cases with uremia or end-stage renal disease were excluded from the study. Similarly, cases where history was suggestive of obstructive sleep apnea, parasomnia, hypersomnia, and neurocognitive disorders were also excluded from the study. In addition, participants with either restrictive or obstructive pulmonary diseases or pregnant women were also not included in this study. All these conditions were diagnosed based on history, clinical examination, and laboratory investigations, wherever required.

Therapy

Cases who consented to participate in the study were randomly divided into three groups till we had thirty patients in each group who have completed 6 weeks of trial. After randomization, medicines were given in a double-blinded manner. Cases fell in one of the following groups: Group A: Bupropion (150 mg/day once daily for first 5 days followed by 300 mg/day in two divided doses), Group B: Ropinirole (0.25 mg before bedtime during first 2 weeks that was increased to 0.5 mg/day before bedtime afterwards), and lastly, Group C: Oral iron (150 mg elemental iron) along with folic acid (500 μg) once a day before bedtime. These doses remained fixed till the end of the study. The night-time doses in all groups were given 2 h before the bedtime.

Schedule of visits

Each case was assessed at the baseline, and thereafter, every 14 th day with the margin of 1 day till 6 weeks. Thus, all the cases had four visits. Biochemical parameters were examined at the baseline and on the last visit. The severity of RLS and RLS-related quality of life (see below) were assessed on each visit. Adverse effects of the medications were recorded on second, third, and fourth visits.

Severity of restless legs syndrome

Severity of RLS was assessed using Hindi version of the international RLS severity rating scale. [11],[12] The severity symptoms were assessed at the time of randomization, as well as at the time of follow-up once every 2-week for 6 weeks. It is a validated scale containing ten questions, each scoring from 0 to 4 (0 = absence of a problem, 4 = very severe problem). The lower the score means, the less-severe is the disease. [11] Based on the score, cases may be categorized into mild (1-10), moderate (11-20), severe (21-30), and very severe (31-40).

Restless legs syndrome-related quality of life

The patients were also assessed for their quality of life using Restless Legs Syndrome Quality of Life (RLSQoL) questionnaire [13],[14] on every visit. It is a validated tool consisting of 18 questions based on how RLS affects the quality of life and measures three basic parameters that may affect the overall quality of life score, work statuses, and sexual interest. Higher scores of RLSQoL score indicate a better quality of life. [13],[14]

Laboratory investigations

Complete hemogram was ordered at the baseline and at the end of the study. In addition, serum ferritin and serum total iron binding capacity (TIBC) levels were also assessed at the baseline and at the end of the study.

Monitoring of adverse effects and augmentation of restless legs syndrome

On each follow-up visit, patients were also monitored for the possible adverse effects using the WHO-Central Drugs Standard Control Organization (CDSCO) form. It is a suspected Adverse Drug Reaction (ADR) Reporting Form for voluntary reporting of suspected ADRs by health care professionals. This is under Pharmacovigilance Programme of India National Coordinating Centre, Indian Pharmacopoeia Commission Ministry of Health and Family Welfare, Government of India. [15] Augmentation was assessed by a sleep physician.

Statistical analysis

Statistical analysis was done with the help of SPSS version 22.0 (IBM Corporation Released 2012, IBM SPSS Statistics for Windows, Version 22.0, Armonk, NY: IBM Corporation, USA). Descriptive statistics was calculated. Categorical variable was presented as proportions. For continuous variables, skewing was calculated. Chi-square test was used to compare proportions between groups. Continuous variables across three groups were compared using one-way ANOVA. The response to therapy at various points was measured using mixed ANOVA with covariates. Baseline hemoglobin, serum ferritin, and serum folate were considered as covariates as they have been described in association with RLS. While comparing the change in RLS severity and RLS-related quality of life across four points of measurements, test of sphericity could not be met in this sample; hence, the Greenhouse-Geisser corrected degrees of freedom were used during interpretation of results. Leven's test depicted that variance was homogeneous.


   Results Top


This study included a total of 103 patients, out of which thirty cases were assigned to each group. Thirteen patients were lost to follow-up during the course of the study.

Females (68.8%) outnumbered males (31.1%) in this study; however, they were equally distributed in each group (χ2 = 0.415; P = 0.81). The average age of the cases in this study was 40.3 ± 12.8 years (range: 18-75 years), and the average duration of illness was 4.1 ± 4.7 years. All the groups were comparable with regards to age and duration of illness (F = 1.698; P = 0.189 and F = 3.099; P = 0.050, respectively). All the three groups were also comparable with regards to prevalence of family history of RLS (χ2 = 4.229; P = 0.1206).

Baseline characteristics of the cases included in all three groups are depicted in [Table 1]. All the three groups were comparable with regards to most of the parameters except the fact that bupropion group had a shorter duration of symptoms, and serum folate level was highest in the iron-folate group. [Table 2] depicts the concentration of hemoglobin, serum ferritin, and TIBC at the baseline and at the end of 6 weeks. There was no clinically significant change in hemoglobin or serum ferritin or TIBC in any of the groups from baseline to the end of the study.
Table 1: Baseline characteristics of the study groups

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Table 2: Change in biochemical parameters over the study period

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Change in severity of restless legs syndrome over time

The results showed that case's scores differed significantly at the four points of measurement, i.e., from baseline visit to last (F = 4.85; P = 0.01). The interaction between the time x treatment group was significant (F = 10.37; P < 0.001) suggesting that all the groups had an improvement with the therapy with the observed power of 0.99. However, we could not find any interaction between time x hemoglobin, time x ferritin, and time x folate measures. All the three groups differed significantly from each other (F = 7.06; P = 0.001) with the observed power of 0.92 with regards to the International Restless Legs Scale (IRLS) score. [Figure 1] shows the scores of all the groups on each visit. It was also found that ropinirole group had the lowest score on the IRLS on the final visit. Pair-wise comparison depicted that this group differed from other two groups which were comparable to each other.
Figure 1: Comparison of International Restless Legs Scale score over time among groups

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Change in restless legs syndrome-related quality of life

Results showed that cases in each group had a difference in the scores on all of their visits (F = 5.12; P = 0.002). However, the interaction of the time with hemoglobin, folate, and ferritin was not significant in any of the treatment arms. After controlling the covariates, pair-wise comparison was made which showed that RLSQoL score of baseline visit were significantly different from remaining three visits (P < 0.001); scores of the second visit were different from that of subsequent visits (P = 0.004 and P < 0.001, respectively), and that of the third visit were also different from the final visit (P < 0.001). Unlike IRLS, we could not find a significant difference among the RLSQoL scores between groups at any point of time (F = 1.2; P = 0.28) as depicted in [Figure 2]. Thus, though the RLSQoL scores differed across time in each group, they were not different between groups.
Figure 2: Changes in restless legs syndrome-related quality of life among groups

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Adverse drug reactions

ADRs were recorded for 6 weeks of the study period in all the patients using the WHO-CDSCO form. A total of 13 ADRs were observed in nine patients out of ninety patients. In the ropinirole group, around 16.67% of patients (five out of thirty patients) presented with ADRs. These were nausea, dizziness, tremor, tingling sensation in palm and sole, gastritis, constipation, and weight gain. In the bupropion group, only gastritis was reported in a single patient. In the iron and folic acid group, 10% of the patients (three out of thirty) presented with ADRs such as constipation, gastritis, and headache. The side effects in all the groups were mild, transient, and did not necessitate stoppage of the treatment. None of the patients opted out of the study because of the adverse drug events.

Patients who did not complete the study

Thirteen cases did not complete the study. Six patients from the iron therapy, four from bupropion, and three from ropinirole. Reasons for drop out were due to no improvement in the initial week of the study.


   Discussion Top


This study showed that in the middle-aged cases with RLS, 6 weeks treatment with ropinirole, bupropion, and oral iron therapy reduce the severity of RLS without any major adverse effect. Moreover, the maximum improvement was noticed in the ropinirole group as compared to the bupropion and oral iron therapy. On the other hand, RLSQOL score improved in all three groups across time, however, no difference among the groups was observed.

Multiple studies have shown that ropinirole is effective for the management of RLS both in the short term and also in the long term using the IRLS score as the measurement of severity. [16],[17],[18],[19],[20],[21],[22],[23],[24],[25],[26] Some of these studies have included cases which were older in age as compared to the cases included in the present study. [20],[25],[26] The methodology of the studies conducted in past some of them was open label, [23] some randomized, [17],[19],[20],[21],[25],[26] and few were single blind, [22] while others were double blinded. [19],[20],[21],[25],[26] Some had placebo control, [17],[18],[19],[20],[21],[25],[26] while others were cross-over trials. [18] Having trials with diverse methodologies make the comparison difficult. As far as the dose of ropinirole is concerned, most of them had prescribed ropinirole in the dose range of 0.25-4 mg/day [17],[19],[21],[25],[26] except one where doses as high as 6 mg/day were prescribed. [18] All the studies have found that ropinirole was well tolerated with minimal and mild adverse effects [17],[18],[19],[20],[21],[22],[23],[26] and in one study treatment, discontinuation was seen in only 9% due to adverse effects. [23] These studies have reported that adverse effects were dose related, and hence the lower incidence of adverse effects in the present study could be related to low dosage.

Bupropion has also been shown to improve RLS although the evidence is mostly anecdotal saving one randomized, placebo-controlled trial that measured improvement using IRLS. [9],[27],[28] However, in this trial, bupropion was prescribed in low doses (150 mg/day). Only available randomized, placebo-controlled trial by Bayard et al. [9] included cases who were older than the cases in the present study. Moreover, this study had shown that bupropion was effective in reducing the RLS severity by the 3 rd week, which was then maintained at the end of 6 th week. This occurred even when the score on depression rating scale did not show a clinically meaningful change across the study. [9] However, we found that bupropion group showed a sustained reduction in the IRLS score over 6 weeks.

Oral iron therapy has been shown to be effective in the management of RLS among children, as well as adults, as compared to the placebo in some studies, but contradictory data are also available. [29],[30],[31],[32],[33],[34] One study compared the oral iron therapy with pramipexole and reported equal improvement in both groups. [32] Improvement in the RLS with iron therapy has been found to correlate with the improvement in serum ferritin. [29],[30] Although we did not find a change in serum ferritin or TIBC in any of the groups over the study period, yet we have found a significant improvement in RLS severity over the study period.

However, we could not find any study that has head-to-head compared three modalities that have been found effective in the management of RLS across various studies. A sizable number of RLS patients show placebo response. [16] We have found that ropinirole group had a greater reduction of IRLS score as compared to other two groups. Considering these two facts, can we consider that bupropion and iron therapy merely acted as a placebo? It appears unlikely if we take into account the studies that have found that iron therapy and bupropion had shown greater improvement as compared to the placebo in the past. [9],[29],[30] Moreover, both bupropion and iron are at least theoretically involved in the pathophysiology of RLS by reducing the reuptake of dopamine and improving the dopamine synthesis, respectively. [2],[35],[36] Still, in the absence of the placebo arm, this notion cannot be completely ruled out.

Like earlier reports, the present study has also found improvement in the RLS-related quality of life in all three groups across time; however, in contradiction to previous studies, we did not find any difference between groups on this measure. [17],[18],[21],[22],[23],[29] It could be related to the fact that earlier studies have compared the ropinirole or oral iron with placebo. Ropinirole is a known dopamine agonist, and thus it may reduce the burden of symptoms and thereby improves the quality of life. Other two molecules that we studied were also pathophysiologically related to the RLS and thus, they could not be considered as placebo. [2],[35],[36] This could be one reason why we found improvement in RLS-related quality of life among all groups. The absence of difference among groups could be related to the fact that IRLS and RLSQoL address separate issues. Although Allen et al. [37] have reported a correlation between these two scales, Vishwakarma et al. [13] did not find the same in the Indian population.

One of the major implications of this study is the use of bupropion in patients with RLS who also have comorbid depression. [9] However, it must be noted that RLS may clinically mimic depression or may be found comorbid with depression or as an adverse effect of antidepressant therapy. [38] As another implication, we also reinforce the conclusion that bupropion should be tested further as an agent to manage RLS in larger randomized, double-blind, controlled trials, especially those patients who are not able to tolerate dopamine agonists or alpha-2-delta ligand agonists. [9]

However, like any other study, this study also had some methodological limitations. First, the sample size was small. Second, the study period was short. Third, doses of the ropinirole were small as compared to the doses mentioned in literature, leaving a possibility that symptoms could be better managed with higher doses. Fourth, we did not control the groups for the presence of depressive symptoms. Fifth, disease duration was short. Sixth, cases included in this study were younger as compared to many of the earlier studies. Lastly, we did not have the placebo arm.

Despite, all these limitations, this is the first study to compare the efficacy of ropinirole with bupropion and oral iron therapy in a randomized, double-blind manner.


   Conclusion Top


This study showed that ropinirole improves the symptoms of RLS, yet bupropion and oral iron therapy were also effective. These treatment modalities also improve the RLS-related quality of life.

Acknowledgment

We are thankful to MAPI research trust for allowing us to use Hindi version of IRLS and RLSQoL.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

 
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    Figures

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    Tables

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    Abstract
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