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<front>
<journal-meta>
<journal-id journal-id-type="publisher-id">Front. Neurosci.</journal-id>
<journal-title>Frontiers in Neuroscience</journal-title>
<abbrev-journal-title abbrev-type="pubmed">Front. Neurosci.</abbrev-journal-title>
<issn pub-type="epub">1662-453X</issn>
<publisher>
<publisher-name>Frontiers Media S.A.</publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="doi">10.3389/fnins.2024.1371601</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Neuroscience</subject>
<subj-group>
<subject>Review</subject>
</subj-group>
</subj-group>
</article-categories>
<title-group>
<article-title>Use of botulinum toxin in the management of dystonia in Parkinson&#x2019;s disease</article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author"><name><surname>Anandan</surname> <given-names>Charenya</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<xref ref-type="aff" rid="aff2"><sup>2</sup></xref>
<uri xlink:href="https://loop.frontiersin.org/people/2631222/overview"/>
<role content-type="https://credit.niso.org/contributor-roles/conceptualization/"/>
<role content-type="https://credit.niso.org/contributor-roles/investigation/"/>
<role content-type="https://credit.niso.org/contributor-roles/methodology/"/>
<role content-type="https://credit.niso.org/contributor-roles/writing-original-draft/"/>
<role content-type="https://credit.niso.org/contributor-roles/writing-review-editing/"/>
</contrib>
<contrib contrib-type="author" corresp="yes"><name><surname>Jankovic</surname> <given-names>Joseph</given-names></name><xref ref-type="aff" rid="aff1"><sup>1</sup></xref>
<xref ref-type="corresp" rid="c001"><sup>&#x002A;</sup></xref>
<uri xlink:href="https://loop.frontiersin.org/people/201718/overview"/>
<role content-type="https://credit.niso.org/contributor-roles/methodology/"/>
<role content-type="https://credit.niso.org/contributor-roles/supervision/"/>
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<aff id="aff1"><sup>1</sup><institution>Department of Neurology, Parkinson's Disease Center and Movement Disorders Clinic, Baylor College of Medicine</institution>, <addr-line>Houston, TX</addr-line>, <country>United States</country></aff>
<aff id="aff2"><sup>2</sup><institution>Neurology Care Line, Michael E. DeBakey VA Medical Center</institution>, <addr-line>Houston, TX</addr-line>, <country>United States</country></aff>
<author-notes>
<fn fn-type="edited-by" id="fn0001">
<p>Edited by: Nicola Modugno, Mediterranean Neurological Institute Neuromed (IRCCS), Italy</p>
</fn>
<fn fn-type="edited-by" id="fn0002">
<p>Reviewed by: Philippe Picaut, AlgoTherapeutix, France</p>
<p>Monika Rudzinska-Bar, Andrzej Frycz Modrzewski Krakow University, Poland</p>
</fn>
<corresp id="c001">&#x002A;Correspondence: Joseph Jankovic, <email>josephj@bcm.edu</email></corresp>
</author-notes>
<pub-date pub-type="epub">
<day>08</day>
<month>04</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="collection">
<year>2024</year>
</pub-date>
<volume>18</volume>
<elocation-id>1371601</elocation-id>
<history>
<date date-type="received">
<day>16</day>
<month>01</month>
<year>2024</year>
</date>
<date date-type="accepted">
<day>19</day>
<month>03</month>
<year>2024</year>
</date>
</history>
<permissions>
<copyright-statement>Copyright &#x00A9; 2024 Anandan and Jankovic.</copyright-statement>
<copyright-year>2024</copyright-year>
<copyright-holder>Anandan and Jankovic</copyright-holder>
<license xlink:href="http://creativecommons.org/licenses/by/4.0/">
<p>This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.</p>
</license>
</permissions>
<abstract>
<p>Botulinum toxin is one of the most potent neurotoxins, but when injected into an overactive muscle, it can transiently alleviate an involuntary movement, such as dystonia. The primary aim of this article is to provide a comprehensive review of the various forms of dystonia observed in patients with Parkinson&#x2019;s disease who can benefit from a therapeutic trial of botulinum toxin. Although most of these indications are not supported by randomized controlled clinical trials and, therefore, not approved by the Food and Drug Administration, there are many open-label trials supporting a large body of empirical experience testifying to the benefits of botulinum toxin treatment in these conditions.</p>
</abstract>
<kwd-group>
<kwd>dystonia</kwd>
<kwd>Parkinson&#x2019;s disease</kwd>
<kwd>botulinum toxin</kwd>
<kwd>blepharospasm</kwd>
<kwd>cervical dystonia</kwd>
</kwd-group>
<contract-sponsor id="cn1">Merz Therapeutics GmbH</contract-sponsor>
<counts>
<fig-count count="0"/>
<table-count count="2"/>
<equation-count count="0"/>
<ref-count count="58"/>
<page-count count="8"/>
<word-count count="5154"/>
</counts>
<custom-meta-wrap>
<custom-meta>
<meta-name>section-at-acceptance</meta-name>
<meta-value>Neurodegeneration</meta-value>
</custom-meta>
</custom-meta-wrap>
</article-meta>
</front>
<body>
<sec sec-type="intro" id="sec1"><label>1</label>
<title>Introduction</title>
<p>Dystonia is present in up to 30% of patients with Parkinson&#x2019;s disease (PD) (<xref ref-type="bibr" rid="ref4">Anandan and Jankovic, 2023</xref>; <xref ref-type="bibr" rid="ref29">Matar and Bhatia, 2023</xref>). In some cases of PD or other parkinsonian disorders, dystonia may be one of the motor features, and in other cases, dystonia may be the dominant movement disorder with parkinsonism as the secondary phenomenon, classified as &#x201C;&#x2018;combined&#x2019; dystonias&#x201D; (<xref ref-type="bibr" rid="ref2">Albanese et al., 2013</xref>). The form of dystonia can be a clue into the type of parkinsonism the patient has. For example, retrocollis/truncal extension is commonly seen in progressive supranuclear palsy (PSP), whereas anterocollis, Pisa sign, and levodopa-induced dyskinesia in the form of oromandibular dystonia are typically seen in multiple system atrophy (MSA), and asymmetric limb dystonia is often present in patients with corticobasal syndrome (CBS) (<xref ref-type="bibr" rid="ref50">Vanek and Jankovic, 2001</xref>).</p>
<p>The non-aerobic bacteria <italic>Clostridium botulinum</italic> produces botulinum toxin (BoNT), the most potent biologic toxin (<xref ref-type="bibr" rid="ref4">Anandan and Jankovic, 2023</xref>). BoNT acts by blocking the release of acetylcholine at the neuromuscular junction, thus causing muscle weakness. This property has been used for therapeutic purposes, including in the treatment of dystonia. There are many indications for BoNT in patients with PD and other parkinsonian disorders (<xref ref-type="bibr" rid="ref20">Jankovic, 2009</xref>; <xref ref-type="bibr" rid="ref9">Cardoso, 2018</xref>; <xref ref-type="bibr" rid="ref22">Jost, 2021</xref>; <xref ref-type="bibr" rid="ref9004">Lapostolle et al., 2022</xref>; <xref ref-type="bibr" rid="ref4">Anandan and Jankovic, 2023</xref>; <xref ref-type="bibr" rid="ref18">Jabbari and Comtesse, 2023</xref>). This article will focus on the use of BoNT in PD-associated dystonia.</p>
</sec>
<sec sec-type="methods" id="sec2"><label>2</label>
<title>Method</title>
<p>On 11 December 2023, we conducted a PubMed advanced search with the title words &#x201C;botulinum,&#x201D; and &#x201C;Parkinson&#x201D; and the text word &#x201C;dystonia.&#x201D; This yielded 14 articles. We also conducted a PubMed advanced search with the title words &#x201C;botulinum&#x201D; and &#x201C;parkinsonism&#x201D; and the text word &#x201C;dystonia.&#x201D; This yielded eight articles. This article was formulated using these articles and other relevant articles.</p>
</sec>
<sec sec-type="discussion" id="sec3"><label>3</label>
<title>Discussion</title>
<p>There are numerous forms of dystonia in patients with PD and other parkinsonian disorders that can benefit from BoNT (<xref ref-type="table" rid="tab1">Table 1</xref>).</p>
<table-wrap position="float" id="tab1"><label>Table 1</label>
<caption>
<p>Treatment of PD-related dystonia with BoNT: review of the literature.</p>
</caption>
<table frame="hsides" rules="groups">
<thead>
<tr>
<th/>
<th align="left" valign="top">Location of dystonia</th>
<th align="left" valign="top">Formulation</th>
<th align="left" valign="top">Number of patients</th>
<th align="left" valign="top">Dose and muscles</th>
<th align="left" valign="top">Results</th>
<th align="left" valign="top">Adverse event (AE)</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="top">1.1</td>
<td align="left" valign="top" colspan="6">Limb dystonia</td>
</tr>
<tr>
<td/>
<td align="left" valign="top">
<xref ref-type="bibr" rid="ref17">Gupta and Visvanathan (2016)</xref>
</td>
<td align="left" valign="top">OnaBoNTA</td>
<td align="left" valign="top">6 PD pts. with DBS and off foot dystonia</td>
<td align="left" valign="top">250&#x2013;400&#x2009;U total- selected based on posture (with 50&#x2013;150 per TP, FDB, FHL, FDL, GS, EHL)</td>
<td align="left" valign="top">3&#x2009;weeks after injection significant improvement noted in pain and dystonia</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td/>
<td align="left" valign="top">
<xref ref-type="bibr" rid="ref16">Gupta et al. (2018)</xref>
</td>
<td align="left" valign="top">OnaBoNTA</td>
<td align="left" valign="top">14 pts. with foot dystonia (11 with PD)</td>
<td align="left" valign="top">Affected muscles injected (FHL, FDL, FDB, GS, TP) were injected with 100&#x2013;300&#x2009;U</td>
<td align="left" valign="top">Stride and step length increased <italic>p</italic>&#x2009;=&#x2009;0.02 in the affected limb</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td/>
<td align="left" valign="top">
<xref ref-type="bibr" rid="ref35">Pacchetti et al. (1995)</xref>
</td>
<td align="left" valign="top">OnaBoNTA</td>
<td align="left" valign="top">30 PD pts. with off foot dystonia were injected</td>
<td align="left" valign="top">TA, GS, TP, FDL, EHL (selected based on posture) with a median dose of 40&#x2009;U per muscle in 2 sites (median dose of 70&#x2009;U per pt.)</td>
<td align="left" valign="top">In 21 pts., pain resolved at 4&#x2009;months</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td/>
<td align="left" valign="top">
<xref ref-type="bibr" rid="ref39">Rieu et al. (2018)</xref>
</td>
<td align="left" valign="top">IncoBoNTA</td>
<td align="left" valign="top">IncoBoNTA or placebo was injected in 45 parkinsonian pts</td>
<td align="left" valign="top">Group 1: 100&#x2009;U in FDB, placebo in FDL<break/>Group 2: 100&#x2009;U in FDL, placebo in FDB<break/>Group 3: placebo in FDL and FDB</td>
<td align="left" valign="top">Mean clinical global impression change (CGI) in the BoNT group compared to the placebo was <italic>p</italic>&#x2009;=&#x2009;0.039</td>
<td align="left" valign="top">Localized foot pain (1)<break/>Transient loss of sensation in the leg (1)<break/>Falls (9)</td>
</tr>
<tr>
<td/>
<td align="left" valign="top">
<xref ref-type="bibr" rid="ref23">Kurtis et al. (2008)</xref>
</td>
<td align="left" valign="top">OnaBoNTA and RimaBoNTB</td>
<td align="left" valign="top">8 pts. had EHL dystonia due to varied pathologies of which 1 had wearing-off dystonia</td>
<td align="left" valign="top">Final stable dose was 50&#x2009;U in EHL in the PD pt</td>
<td align="left" valign="top">EHL injection doses were found to be safe, even up to 160 u OnaBoNTA</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td/>
<td align="left" valign="top">
<xref ref-type="bibr" rid="ref25">Lindholm et al. (2017)</xref>
</td>
<td align="left" valign="top">IncoBoNTA</td>
<td align="left" valign="top">10 PD pts. with striatal foot deformity were injected</td>
<td align="left" valign="top">10-25&#x2009;U in EHL, 20-50&#x2009;U in FDL, 40&#x2013;70 TP, 15&#x2009;U in GM</td>
<td align="left" valign="top">Standing balance improved at 4&#x2009;weeks but not at 16&#x2009;weeks</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td/>
<td align="left" valign="top">
<xref ref-type="bibr" rid="ref15">Giladi et al. (1994)</xref>
</td>
<td align="left" valign="top">OnaBoNTA</td>
<td align="left" valign="top">2 pts. with striatal toe</td>
<td align="left" valign="top">50&#x2013;70&#x2009;U in EHL</td>
<td align="left" valign="top">80&#x2013;90% subjective improvement</td>
<td align="left" valign="top">Some EHL weakness</td>
</tr>
<tr>
<td/>
<td align="left" valign="top">
<xref ref-type="bibr" rid="ref12">Cordivari et al. (2001)</xref>
</td>
<td align="left" valign="top">AboBoNTA</td>
<td align="left" valign="top">14 pts. with a clenched fist (of which 7PD, 3 CBD)</td>
<td align="left" valign="top">220&#x2013;1,200&#x2009;units in different affected muscles</td>
<td align="left" valign="top">All 14 had improvement in posture; 4 of 7 PD pts. had meaningful improvement in function</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td/>
<td align="left" valign="top">
<xref ref-type="bibr" rid="ref32">Ni et al. (2023)</xref>
</td>
<td align="left" valign="top">BoNT-A (HengLi, Lanzhou institute of biological products Co. LTD, China)</td>
<td align="left" valign="top">25 PD pts. with foot dystonia</td>
<td align="left" valign="top">Various doses in TP, TA, FHL, FDL, FDB, EHL, GM, FHB approximately 85&#x2013;250&#x2009;U per limb</td>
<td align="left" valign="top">BoNT reduced pain and helped posture</td>
<td align="left" valign="top">Transient weakness (3)<break/>Fullness sensation (1)</td>
</tr>
<tr>
<td align="left" valign="top">1.2</td>
<td align="left" valign="top" colspan="6">Blepharospasm</td>
</tr>
<tr>
<td/>
<td align="left" valign="top">
<xref ref-type="bibr" rid="ref28">Martinez-Ramirez et al. (2014)</xref>
</td>
<td align="left" valign="top">OnaBoNTA, RimaBoNTB</td>
<td align="left" valign="top">64 (41 had primary) and 23 had secondary BSP (of which 12 pts. had PD and 3 had PSP)</td>
<td align="left" valign="top">39.2&#x2013;57.2&#x2009;units in lateral oculi, pretarsal OO, corrugator, procerus, and frontalis</td>
<td align="left" valign="top">Both primary and secondary BSP responded well</td>
<td align="left" valign="top">Diplopia (3)<break/>Ptosis (1)<break/>Dry eyes (1)<break/>Bruising (1)</td>
</tr>
<tr>
<td/>
<td align="left" valign="top">
<xref ref-type="bibr" rid="ref24">Lepore et al. (1995)</xref>
</td>
<td align="left" valign="top">OnaBoNTA</td>
<td align="left" valign="top">1&#x2009;pt. with BSP</td>
<td align="left" valign="top">20&#x2009;U in orbicularis oculi</td>
<td align="left" valign="top">Improvement for 2&#x2013;3&#x2009;months</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td align="left" valign="top">1.3</td>
<td align="left" valign="top" colspan="6">Oromandibular dystonia</td>
</tr>
<tr>
<td/>
<td align="left" valign="top">
<xref ref-type="bibr" rid="ref1">Agarwal (2019)</xref>
</td>
<td align="left" valign="top">OnaBoNTA</td>
<td align="left" valign="top">2 PD pts. with wearing off jaw-opening dystonia</td>
<td align="left" valign="top">10&#x2009;U each into lateral pterygoid and digastric muscles</td>
<td align="left" valign="top">Improvement noted in OMD</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td/>
<td align="left" valign="top">
<xref ref-type="bibr" rid="ref41">Rosales et al. (2011)</xref>
</td>
<td align="left" valign="top">AboBoNTA</td>
<td align="left" valign="top">109 XDP pts. injected (50 OMD, 35 lingual, 24 truncal axial)</td>
<td align="left" valign="top">Varied based on pathology</td>
<td align="left" valign="top">Substantial improvement was noted on the dystonia rating scale (DRS) with OMD, and moderate improvement noted with truncal dystonia</td>
<td align="left" valign="top">Dry mouth and dysphagia were the most common complications</td>
</tr>
<tr>
<td align="left" valign="top">1.4</td>
<td align="left" valign="top" colspan="6">Trunk abnormalities</td>
</tr>
<tr>
<td/>
<td align="left" valign="top">
<xref ref-type="bibr" rid="ref8">Bonanni et al. (2007)</xref>
</td>
<td align="left" valign="top">AboBoNTA</td>
<td align="left" valign="top">9 pts. with lateral axial dystonia in dopa-responsive parkinsonism- double-blind cross-over trial of BoNT vs. placebo</td>
<td align="left" valign="top">Total of 500&#x2009;U injected into the paraspinal muscle</td>
<td align="left" valign="top">BoNT effective in 6 pts</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td/>
<td align="left" valign="top">
<xref ref-type="bibr" rid="ref5">Artusi et al. (2019)</xref>
</td>
<td align="left" valign="top">OnaBoNTA</td>
<td align="left" valign="top">15 PD pts. with Pisa syndrome</td>
<td align="left" valign="top">Mean of 50&#x2013;75&#x2009;units per paraspinal muscle and 25&#x2013;50&#x2009;U per abdominal muscle</td>
<td align="left" valign="top">11/13 pts. improved in lateral flexion</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td/>
<td align="left" valign="top">
<xref ref-type="bibr" rid="ref46">Tassorelli et al. (2014)</xref>
</td>
<td align="left" valign="top">IncoBoNTA</td>
<td align="left" valign="top">26 PD pts. were enrolled in the randomized placebo-controlled trial for Pisa Syndrome</td>
<td align="left" valign="top">50-200&#x2009;U injected in some of the following muscles: rectus abdominus, inferior thoracic paraspinal, iliopsoas, multifidus</td>
<td align="left" valign="top">Lateral flexion benefited the treatment group (<italic>p</italic>&#x2009;=&#x2009;0.044)</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td/>
<td align="left" valign="top">
<xref ref-type="bibr" rid="ref6">Azher and Jankovic (2005)</xref>
</td>
<td align="left" valign="top">OnaBoNTA</td>
<td align="left" valign="top">Of 16 camptocormia pts. injected (11 with PD and 4 with axial dystonia)</td>
<td align="left" valign="top">300&#x2013;600&#x2009;U injected in rectus abdominis of 9 pts.<break/>(contraction of rectus abdominis felt)</td>
<td align="left" valign="top">4 of 9 had improvement in symptoms</td>
<td align="left" valign="top">None</td>
</tr>
<tr>
<td/>
<td align="left" valign="top">
<xref ref-type="bibr" rid="ref14">Fietzek et al. (2009)</xref>
</td>
<td align="left" valign="top">IncoBoNTA</td>
<td align="left" valign="top">10 pts. of camptocormia (does not specify if in PD)</td>
<td align="left" valign="top">100&#x2013;300&#x2009;units injected in iliopsoas or rectus abdominis (active abdominal contractions not reported)</td>
<td align="left" valign="top">No improvement was reported</td>
<td align="left" valign="top">Soreness in muscle (2)</td>
</tr>
<tr>
<td/>
<td align="left" valign="top">
<xref ref-type="bibr" rid="ref52">von Coelln et al. (2008)</xref>
</td>
<td align="left" valign="top">AboBoNTA</td>
<td align="left" valign="top">4 pts. with camptocormia (3 PD and 1 MSA)</td>
<td align="left" valign="top">500-1500&#x2009;U per iliopsoas injected</td>
<td align="left" valign="top">2 experienced modest benefits, 2 experienced worsening symptoms</td>
<td align="left" valign="top">Pruritis at injection site (1), hip flexion weakness (4)</td>
</tr>
<tr>
<td/>
<td align="left" valign="top">
<xref ref-type="bibr" rid="ref48">Todo et al. (2018)</xref>
</td>
<td align="left" valign="top">OnaBoNTA</td>
<td align="left" valign="top">6 PD pts. with camptocormia</td>
<td align="left" valign="top">75 to 90&#x2009;U injected into the external oblique</td>
<td align="left" valign="top">Subjective relief noted in 4 of 6 pts</td>
<td align="left" valign="top">None</td>
</tr>
</tbody>
</table>
</table-wrap>
<sec id="sec4"><label>3.1</label>
<title>Limb dystonia</title>
<p>Foot dystonia, produced by involuntary, repetitive, twisting contractions of muscles in the foot, occurs most often when carbidopa-levodopa wears off (<xref ref-type="bibr" rid="ref22">Jost, 2021</xref>; <xref ref-type="bibr" rid="ref4">Anandan and Jankovic, 2023</xref>). This &#x201C;wearing off&#x201D; foot dystonia is usually characterized by ankle plantarflexion/inversion, with toes curling usually downward, but sometimes the toes (particularly the big toe) extend. There are several reports that have discussed the benefits of BoNT in &#x201C;wearing off&#x201D; foot dystonia (<xref ref-type="bibr" rid="ref17">Gupta and Visvanathan, 2016</xref>; <xref ref-type="bibr" rid="ref39">Rieu et al., 2018</xref>). In our clinic, we treat this form of dystonia with BoNT injections in the tibialis posterior, flexor digitorum brevis, flexor digitorum longus, and extensor hallucis longus. We occasionally also target the gastrocnemius if there is troublesome plantar flexion or associated calf cramps. Among 13 patients with upper limb dystonia due to X-linked dystonia parkinsonism (XDP), a median 12-week benefit after BoNT injection was noted, with 15% of patients experiencing weakness post-injection (<xref ref-type="bibr" rid="ref41">Rosales et al., 2011</xref>).</p>
<p>&#x201C;Striatal toe&#x201D; is a form of fixed deformity, which is different from &#x201C;wearing off&#x201D; foot dystonia. Approximately 13% of patients with PD can have striatal limb deformities and the cause remains unknown (<xref ref-type="bibr" rid="ref53">Wijemanne and Jankovic, 2019</xref>). This can affect gait and reduce the ability to stand and ambulate (<xref ref-type="bibr" rid="ref25">Lindholm et al., 2017</xref>). Targeting the extensor hallucis longus with BoNT can be quite effective (<xref ref-type="bibr" rid="ref23">Kurtis et al., 2008</xref>).</p>
<p>Clenched fists due to dystonia can be a late complication in PD and other parkinsonism disorders (<xref ref-type="bibr" rid="ref21">Jocson and Lew, 2019</xref>). There are reports of this focal dystonia improving with BoNT, thus improving function and facilitating good hygiene (<xref ref-type="bibr" rid="ref12">Cordivari et al., 2001</xref>). Striatal hand and foot deformities are not thought to derive from dystonia; hence, BoNT has not been traditionally used to treat these conditions (<xref ref-type="bibr" rid="ref53">Wijemanne and Jankovic, 2019</xref>).</p>
</sec>
<sec id="sec5"><label>3.2</label>
<title>Cervical dystonia</title>
<p>Cervical dystonia (CD) is the most common form of focal dystonia encountered in movement disorders clinics. It can lead to abnormal head/neck posture and movement, tremors, and pain (<xref ref-type="bibr" rid="ref3">Albanese et al., 2023</xref>). CD was found to be present in 33.9% of patients with PD (<xref ref-type="bibr" rid="ref22">Jost, 2021</xref>). Oromandibular dystonia, anterocollis, and scoliosis (Pisa sign) are commonly seen in patients with parkinsonism, especially in those with MSA (<xref ref-type="bibr" rid="ref27">Marsili and Truong, 2020</xref>). Dysphagia is a common complication of anterocollis, and this can be worsened with anterior neck muscle BoNT injections, particularly with bilateral injections; hence, it is crucial to start with low doses of BoNT in these instances. The usefulness of BoNT in the treatment of CD has been demonstrated in numerous trials (<xref ref-type="bibr" rid="ref9002">Hammoud and Jankovic, 2022</xref>). In one study of 144 patients with CD and 24 due to parkinsonism, the duration of benefit, dosage of BoNT, and occurrence of dysphagia after BoNT were similar in patients with CD and associated parkinsonism vs. CD without parkinsonism (<xref ref-type="bibr" rid="ref36">Patterson et al., 2016</xref>). Of the 109 patients with XDP, 21 had torticollis, 11 had retrocollis, 14 had laterocollis, and 10 had anterocollis (<xref ref-type="bibr" rid="ref41">Rosales et al., 2011</xref>). The median dose of abobotulinum toxin A injected per visit varied from 250 to 500&#x2009;units. The authors reported improvement lasting approximately 12&#x2009;weeks; the frequency of dysphagia ranged from 14% for torticollis to 20% for anterocollis (<xref ref-type="bibr" rid="ref41">Rosales et al., 2011</xref>).</p>
</sec>
<sec id="sec6"><label>3.3</label>
<title>Blepharospasm</title>
<p>Blepharospasm is a form of focal dystonia that is characterized by involuntary eye closure due to contractions of the orbicularis oculi and other periorbital muscles (<xref ref-type="bibr" rid="ref40">Romano et al., 2022</xref>). Blepharoclonus, manifested by repetitive spasms of the eyelids without actual eye closure, was noted in 84% of patients with PD in one recent study (<xref ref-type="bibr" rid="ref26">Margolesky et al., 2024</xref>). Apraxia of eyelid opening, which is manifested by the inability to open eyes (presumably by inhibition of the levator oculi), typically associated with compensatory frontalis contraction, can also be seen in PD but is even more frequent in patients with atypical parkinsonism (<xref ref-type="bibr" rid="ref38">Piccione et al., 1997</xref>; <xref ref-type="bibr" rid="ref54">Yoon et al., 2005</xref>). A retrospective review of 64 patients with blepharospasm, 41 with primary blepharospasm, and 23 with secondary blepharospasm, of which 12 had PD and 3 had PSP, examined the effects of BoNT treatment. BoNT injections (either onabotulinumtoxin A or rimabotulinumtoxin B was used) into the periorbital muscles (including the lateral oculi, pretarsal, procerus, corrugator, and frontalis) resulted in benefits lasting 9.43 and 9.67&#x2009;weeks in primary and secondary blepharospasm, respectively (<xref ref-type="bibr" rid="ref28">Martinez-Ramirez et al., 2014</xref>). Onabotulinumtoxin A (12.5&#x2009;units per eye injection into the junction of the preseptal and pretarsal portions) can produce relief in patients with apraxia of the eyelid opening associated with parkinsonism (<xref ref-type="bibr" rid="ref38">Piccione et al., 1997</xref>). In another study, onabotulinumtoxin A 20&#x2009;U into the pretarsal portion of orbicularis oculi produced benefits for 2&#x2013;3&#x2009;months (<xref ref-type="bibr" rid="ref24">Lepore et al., 1995</xref>). There are additional reports of improved apraxia of eyelid opening after BoNT (<xref ref-type="bibr" rid="ref13">Defazio et al., 1990</xref>; <xref ref-type="bibr" rid="ref19">Jankovic, 1996</xref>).</p>
</sec>
<sec id="sec7"><label>3.4</label>
<title>Oromandibular dystonia</title>
<p>Oromandibular dystonia is relatively uncommon in PD, but it is a relatively common complication of levodopa therapy in MSA (<xref ref-type="bibr" rid="ref4">Anandan and Jankovic, 2023</xref>). Wearing off jaw dystonia has been reported to improve after BoNT injections (<xref ref-type="bibr" rid="ref1">Agarwal, 2019</xref>). In X-linked dystonia parkinsonism, 32 patients had jaw-opening dystonia, treated with BoNT injections into the lateral pterygoid and anterior digastric muscles with a median dose of 100&#x2009;U of abobotulinumtoxin A. A total of 12 patients with jaw closing dystonia (injected into masseter, temporalis, and medial pterygoid with a median dose of 150&#x2009;U of abobotulinumtoxin A) and 6 patients with jaw deviation (injected into lateral pterygoid and temporalis with a median dose of 100&#x2009;U abobotulinumtoxin A) noted median improvement lasting 8&#x2013;16 and 12&#x2013;24&#x2009;weeks, respectively; 17&#x2013;19% experienced adverse effects such as dry mouth and dysphagia (<xref ref-type="bibr" rid="ref41">Rosales et al., 2011</xref>). Many patients with PD and other parkinsonian disorders experience temporomandibular joint pain, most likely related to daytime or nocturnal bruxism (<xref ref-type="bibr" rid="ref34">Ondo et al., 2018</xref>; <xref ref-type="bibr" rid="ref51">Verhoeff et al., 2022</xref>; <xref ref-type="bibr" rid="ref30">Minervini et al., 2023</xref>). Based on a double-blind, placebo-controlled trial, BoNT injections targeting the masseter and temporalis muscles have been found to be safe and effective in the treatment of bruxism (<xref ref-type="bibr" rid="ref34">Ondo et al., 2018</xref>).</p>
</sec>
<sec id="sec8"><label>3.5</label>
<title>Laryngeal dystonia</title>
<p>Spasmodic dysphonia is a focal dystonia involving the laryngeal muscles associated with either adductor spasm (resulting in a strained voice and breaks in phonation) or, rarely, abductor spasm (associated with breathy voice and voiceless pauses) or both (<xref ref-type="bibr" rid="ref49">Truong and Bhidayasiri, 2006</xref>; <xref ref-type="bibr" rid="ref44">Simonyan et al., 2021</xref>). These can be successfully treated with BoNT injections into the thyroarytenoid muscle (for adductor spasmodic dysphonia) and the posterior cricoarytenoid muscle (for abductor spasmodic dysphonia). In one patient with PD who did not respond to BoNT-A (abobotulinumtoxin A followed by onabotulinumtoxin A was tried) for spasmodic dysphonia, BoNT-B (Neurobloc) was effective (<xref ref-type="bibr" rid="ref42">Sachdev et al., 2019</xref>). It is unclear why there was no response to type A BoNT in this spurious single-case report.</p>
</sec>
<sec id="sec9"><label>3.6</label>
<title>Trunk abnormalities</title>
<p>One-third of PD patients have abnormal truncal postures, which may also include Pisa syndrome (leaning to one side due to scoliosis), lateral axial dystonia, and camptocormia (<xref ref-type="bibr" rid="ref53">Wijemanne and Jankovic, 2019</xref>). Pisa syndrome occurs in 7&#x2013;10% of PD patients (<xref ref-type="bibr" rid="ref5">Artusi et al., 2019</xref>). An improvement in the axial posture was found in a double-blind placebo-controlled trial of incobotulinum toxin A injected into muscles individually identified for patients with Pisa syndrome (<xref ref-type="bibr" rid="ref46">Tassorelli et al., 2014</xref>). A PD patient with Pisa syndrome improved after undergoing paraspinal muscle abobotulinumtoxin A injections and a rehabilitation program (<xref ref-type="bibr" rid="ref43">Santamato et al., 2010</xref>). Pisa syndrome due to lateral axial dystonia (dystonic scoliosis) can be painful and affect mobility (<xref ref-type="bibr" rid="ref8">Bonanni et al., 2007</xref>). Camptocormia is characterized by moderate to marked flexion of the thoracolumbar spine caused by isolated axial dystonia or complex dystonia related to underlying PD or other parkinsonian disorders (<xref ref-type="bibr" rid="ref6">Azher and Jankovic, 2005</xref>; <xref ref-type="bibr" rid="ref53">Wijemanne and Jankovic, 2019</xref>). Several case series have reported inconsistent improvement of camptocormia with BoNT injections, but BoNT targeting the rectus abdominis or external oblique muscle may be very effective in improving the axial posture (<xref ref-type="bibr" rid="ref6">Azher and Jankovic, 2005</xref>; <xref ref-type="bibr" rid="ref11">Colosimo and Salvatori, 2009</xref>; <xref ref-type="bibr" rid="ref14">Fietzek et al., 2009</xref>). Among 109 patients with X-linked dystonia parkinsonism, 12 had trunk flexor dystonia, 7 had trunk extensor dystonia, and 5 had lateral trunk dystonia, and they were injected with abobotulinumtoxin A with a median dose of 400&#x2009;U in rectus abdominis, 750&#x2009;U in bilateral erector spinae, and 1,000&#x2009;U in ipsilateral erector spinae, respectively (<xref ref-type="bibr" rid="ref41">Rosales et al., 2011</xref>).</p>
</sec>
<sec id="sec10"><label>3.7</label>
<title>Levodopa-related dystonia</title>
<p>Levodopa-related dystonia is a well-recognized complication of levodopa therapy in patients with PD (<xref ref-type="bibr" rid="ref9003">Jameson, 1970</xref>; <xref ref-type="bibr" rid="ref9001">Cooper, 1972</xref>; <xref ref-type="bibr" rid="ref37">Pfeiffer and LeDoux, 2015</xref>). One single case report described a patient with PD who developed jaw deviation dystonia during a peak dose of levodopa, which improved after medication reduction and onabotulinum toxin A injection of 40&#x2009;U into each lateral pterygoid and 7.5&#x2009;U into each submental muscle (<xref ref-type="bibr" rid="ref37">Pfeiffer and LeDoux, 2015</xref>). In another PD patient with jaw-opening dystonia, a 40% improvement was noted after BoNT was injected into lateral pterygoids (<xref ref-type="bibr" rid="ref47">Tee et al., 2019</xref>). The use of BoNT for levodopa-related dystonia is based on anecdotal case reports and our own experience. We have found that BoNT injections into the affected muscles, particularly those involved in wearing off-foot dystonia, are very effective in most patients. It is best for these conditions to be treated by movement disorder-trained neurologists who have excellent understanding and experience in BoNT use.</p>
<p>Orofacial dyskinesia, often in the form of oromandibular dystonia (discussed above), raises concern for MSA (<xref ref-type="bibr" rid="ref33">Onder and Comoglu, 2023</xref>). In a retrospective chart review of 83 patients with PSP, 3 patients with levodopa-induced dyskinesias were identified (1 blepharospasm, 1 jaw closure dystonia, and 1 limb dystonia), testifying to the rare occurrence of this complication in patients with PSP (<xref ref-type="bibr" rid="ref7">Barclay and Lang, 1997</xref>). This is also suggested by rare case reports of oromandibular dystonia (<xref ref-type="bibr" rid="ref45">Tan et al., 2003</xref>; <xref ref-type="bibr" rid="ref31">Modreanu et al., 2018</xref>), facial dystonia (<xref ref-type="bibr" rid="ref10">Chung and Kim, 2012</xref>), and cranial dystonia (<xref ref-type="bibr" rid="ref33">Onder and Comoglu, 2023</xref>) in PSP that resolved after discontinuation of levodopa.</p>
</sec>
</sec>
<sec sec-type="conclusions" id="sec11"><label>4</label>
<title>Conclusion</title>
<p>BoNT usage is expanding across many fields of medicine and beyond. Isolated dystonia continues to be one of the most common indications for BoNT treatment, but BoNT is increasingly used in patients with combined and complex dystonia in the setting of PD and other parkinsonian disorders. Although most of these forms of dystonia are not yet supported by randomized controlled clinical trials, their improvement with BoNT is becoming well established. BoNT is also used for many other PD-related symptoms, such as tremors, sialorrhea, dyskinesia, urinary symptoms, and others. Patients receiving BoNT in multiple locations should have the injections administered on the same day, and the total dose of BoNT should be kept below 600&#x2009;units to reduce the risk of generalized weakness or immunogenicity.</p>
</sec>
<sec sec-type="author-contributions" id="sec12">
<title>Author contributions</title>
<p>CA: Conceptualization, Investigation, Methodology, Writing &#x2013; original draft, Writing &#x2013; review &#x0026; editing. JJ: Methodology, Supervision, Writing &#x2013; original draft, Writing &#x2013; review &#x0026; editing.</p>
</sec>
</body>
<back>
<sec sec-type="funding-information" id="sec14">
<title>Funding</title>
<p>The author(s) declare that financial support was received for the research, authorship, and/or publication of this article. The authors received funding to publish this article from Merz Therapeutics GmbH.</p>
</sec>
<sec sec-type="COI-statement" id="sec15">
<title>Conflict of interest</title>
<p>JJ has training or research grants from Abbvie Inc.; Dystonia Coalition; Merz Pharmaceuticals; and Revance Therapeutics Inc. He has served as a consultant for Abbvie Inc.; Aeon Biopharma; Neurocrine; Revance Therapeutics; and Teva Pharmaceutical Industries Ltd. JJ has received royalties from Cambridge; Elsevier; MedLink Neurology; Lippincott Williams and Wilkins; UpToDate; Wiley Blackwell and is a member of the following editorial boards: Expert Review of Neurotherapeutics; MedLink Neurology in Clinical Practice; Therapeutic Advances in Neurological Disorders; Neurotherapeutics; Toxins; Tremor and Other Hyperkinetic Movements; and Journal of Parkinson&#x2019;s Disease.</p>
<p>The remaining author declares that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.</p>
</sec>
<sec id="sec100" sec-type="disclaimer">
<title>Publisher&#x2019;s note</title>
<p>All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.</p>
</sec>
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</ref-list>
<sec id="sec13">
<title>Glossary</title>
<table-wrap position="anchor" id="tab2">
<table frame="hsides" rules="groups">
<tbody>
<tr>
<td align="left" valign="top">aboBoNTA</td>
<td align="left" valign="top">Abobotulinumtoxin A</td>
</tr>
<tr>
<td align="left" valign="top">ALO</td>
<td align="left" valign="top">Apraxia of eyelid opening</td>
</tr>
<tr>
<td align="left" valign="top">BSP</td>
<td align="left" valign="top">Blepharospasm</td>
</tr>
<tr>
<td align="left" valign="top">BoNT</td>
<td align="left" valign="top">Botulinum toxin</td>
</tr>
<tr>
<td align="left" valign="top">EMG</td>
<td align="left" valign="top">Electromyography</td>
</tr>
<tr>
<td align="left" valign="top">EHL</td>
<td align="left" valign="top">Extensor hallucis longus</td>
</tr>
<tr>
<td align="left" valign="top">FDB</td>
<td align="left" valign="top">Flexor digitorum brevis</td>
</tr>
<tr>
<td align="left" valign="top">FDL</td>
<td align="left" valign="top">Flexor digitorum longus</td>
</tr>
<tr>
<td align="left" valign="top">FHB</td>
<td align="left" valign="top">Flexor hallucis brevis</td>
</tr>
<tr>
<td align="left" valign="top">FHL</td>
<td align="left" valign="top">Flexor hallucis longus</td>
</tr>
<tr>
<td align="left" valign="top">GM</td>
<td align="left" valign="top">Gastrocnemius</td>
</tr>
<tr>
<td align="left" valign="top">GS</td>
<td align="left" valign="top">Gastrocnemius-soleus</td>
</tr>
<tr>
<td align="left" valign="top">incoBoNTA</td>
<td align="left" valign="top">Incobotulinumtoxin A</td>
</tr>
<tr>
<td align="left" valign="top">MSA</td>
<td align="left" valign="top">Multiple system atrophy</td>
</tr>
<tr>
<td align="left" valign="top">OO</td>
<td align="left" valign="top">Orbicularis oculi</td>
</tr>
<tr>
<td align="left" valign="top">OMD</td>
<td align="left" valign="top">Oromandibular dystonia</td>
</tr>
<tr>
<td align="left" valign="top">OnaBoNTA</td>
<td align="left" valign="top">Onabotulinumtoxin A</td>
</tr>
<tr>
<td align="left" valign="top">PSP</td>
<td align="left" valign="top">Progressive supranuclear palsy</td>
</tr>
<tr>
<td align="left" valign="top">PD</td>
<td align="left" valign="top">Parkinson&#x2019;s disease</td>
</tr>
<tr>
<td align="left" valign="top">Pt, Pts</td>
<td align="left" valign="top">Patient, patients</td>
</tr>
<tr>
<td align="left" valign="top">RimaBoNTB</td>
<td align="left" valign="top">Rimabotulinumtoxin B</td>
</tr>
<tr>
<td align="left" valign="top">TA</td>
<td align="left" valign="top">Tibialis anterior</td>
</tr>
<tr>
<td align="left" valign="top">TP</td>
<td align="left" valign="top">Tibialis posterior</td>
</tr>
<tr>
<td align="left" valign="top">U</td>
<td align="left" valign="top">Units</td>
</tr>
<tr>
<td align="left" valign="top">XDP</td>
<td align="left" valign="top">X-linked dystonia parkinsonism</td>
</tr>
</tbody>
</table>
</table-wrap>
</sec>
</back>
</article>