Parkinson's Disease-Review

Journal of Research in Medical and Dental Science
eISSN No. 2347-2367 pISSN No. 2347-2545

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Review - (2020) Volume 8, Issue 6

Parkinson's Disease-Review

Raghu S1*, Kothai R2 and Sankar V2

*Correspondence: Raghu S, Vinayaka Mission’s College of Pharmacy, Yearcaud Main Road Kondappanaikanpatty, Salem, Tamilnadu, India, Email:

Author info »


Parkinson’s disease is the second most basic neurodegenerative disease, influencing 1% of the populations. but the diagnosis and management is quiet difficult. PD considering many motor and non-motor disorders. The medical management is hard because the choices of drugs are limited, and levodopa is the mainstay of treatment. Patients receiving long-term therapy of levodopa must contend with some adverse effects seen in Parkinson's disease patients treated with levodopa. This side effect is usually encountered after a long duration of treatment, but occasionally, this may be seen even after a few days or months of treatment. Different types of surgical approaches, including unilateral pallidotomy, Subthalamotomy and deep brain stimulation, have given particularly good results in PD patients, medical and surgical approaches some time give a better result compare than mono therapy.


PD, Pallidotomy, Subthalamotomy, Levodopa


Parkinson’s disease is the second most basic neurodegenerative disease, influencing 1% of the populace, beyond 65 years old. Parkinson's sickness was first depicted by Dr. James Parkinson in 1817 as a "shaking palsy [1]. Parkinson's illness is described by bradykinesia, rest tremor, unbending nature and, later in the malady course, postural instability. Neuronal decline in the brainstem (substantia nigra) prompts a significant dopamine insufficiency in the striatum. Misery is normal in Parkinson's malady. Parkinson's malady frequently happens with no undeniable basic reason, yet it might be the consequence of cerebral ischemia, viral encephalitis or different kinds of obsessive harm. This can likewise be medication instigated, the principle medications included being those that decrease the measure of dopamine in the brain (for example Reserpine). Levodopa, combined with a dopa-decarboxylase inhibitor, remains the most powerful oral treatment for Parkinson's illness. A few other medication medicines are accessible for the administration of Parkinson's malady. At the point when given as adjunctive treatment to levodopa, the essential point of these specialists is to smooth out motor vacillations. Careful medicines of Parkinson's malady, utilizing profound mind incitement, are compelling in exceptionally chose genuine cases. Flow treatment is centered around symptomatic administration The ailment is of so long length: to interface, consequently, the side effects which happen in its later stages with those which imprint its initiation, requires a continuation of perception of same cases, or if nothing else a right history of its side effects, in any event, for a few years [2]. Research recommends that the pathophysiological changes related with Parkinson’s disease may begin before the beginning of motor includes and may incorporate various non motor symptoms, for example, rest issue, wretchedness, and subjective changes [3]. Present treatment procedures are planned for improving side effects, however expanding endeavors are being made to preliminary neuroprotective medications that are conceivably moderate or counteract the advancement of symptoms [4]. Insight into the primary clinical introductions of these pre-diagnostic highlights would depict the pathophysiology of early Parkinson's ailment movement and to recognize individuals at expanded danger of improvement over Parkinson's ailment who might be qualified for incorporation in clinical preliminaries of neuroprotective systems.


The genuine reason for Parkinson's sickness is obscure and idiopathic and no endogenous or ecological neurotoxin has been found. In any case, the likelihood that such a synthetic exists has been proposed drastically by the disclosure in Californian medication addicts (who were attempting to make pethidine) that 1‐methyl‐4‐phenyl‐1,2,3,6‐tetrahydropyridine (MPTP) causes degeneration of the nigro-striatal tract and Parkinson's infection. MPTP acts by implication by means of a metabolite, 1‐methyl‐4‐ phenylpyridine (MPP+), which is framed by the activity of MAOB. It is not sure how MPP+ slaughters dopaminergic nerve cells, however free radicals created during its arrangement by MAOB may harm mitochondria and additionally harm the cell layer by peroxidation. The disclosure of an autosomal predominant familial type of Parkinson’s disease brought about by a transformation in the α-synuclein gene has started interest for hereditary constitution as a factor clarifying the improvement of parkinson’s disease [5]. In expansion to condition and hereditary qualities, it has likewise been accounted for that side-effects of ordinary dopamine digestion (e.g., hydrogen peroxide) can prompt the generation of free radicals that reason peroxidation of cell membranes and cell death. Along these lines, the most alluring theory for the etiology of Parkinson’s disease is that the infection results from a perplexing interaction of age-related changes to the nigro striatal tract, hereditary inclination, and poison presentation. Medication instigated parkinsonism is the second most regular reason for parkinsonism in more seasoned individuals. Drug-incited parkinsonism in most of cases results from post synaptic dopamine receptor blockade, with the most widely recognized offending operators being neuroleptics and related mixes (for example Enemies of emetics). Some different medications have been accounted for to cause drug instigated parkinsonism, including lithium, valproic acid corrosive and certain calcium channel blockers (cinnarizine and flunarizine). Certain medications, for example, neuroleptic antipsychotics (chlorpromazine, haloperidol, and so on.) Used for the treatment of schizophrenia and psychosis can essentially lessen dopaminergic transmission [5] and cause Parkinson-like symptoms. Pollutants like carbon disulphide, manganese, mercury may likewise be the etiologies in a portion of the uncommon cases. Genetic forms of the diseases present only small (5-10%) due to the Presence of family history, early onset of disease [6].


Parkinson’s disease is a disorder of the extrapyramidal framework, which incorporates motor structures of the basal ganglia, and is described by the loss of dopaminergic capacity and subsequent decreased motor work, prompting clinical highlights of the disease [6,7]. in Parkinson’s disease, dopamine (the inhibitory synapse) is Progressively lost in the nigrostriatal tracts, and acetylcholine (the excitatory synapse) is generally expanded. It is generally accepted that a 70% to 80% loss of nigral neurons. Must happen before Parkinson’s disease turns out to be clinically recognizable. On Pathological assessment of post-mortem basal ganglia, the presence Of Lewy bodies (circular, strange intraneuronal protein Aggregates) are noted inside the remaining dopaminergic cells of the substantia nigra [7]. Two kinds of dopamine receptors, D1 (excitatory sort) and D2 (inhibitory sort), impact motor action in the extrapyramidal framework. Parts of this framework incorporate the basal ganglia, which includes the inward globus pallidal fragment (gpi) of the ventral striatum, and the standards reticulate bit of the substantia nigra (snpr). These segments are a piece of bigger circuits situated in the thalamus and the cortex. The loss of dopamine in the striatum of Parkinson’s disease patients brings about expanded action in the gpi/snpr circuits and resulting gamma amino butyric corrosive (GABA) brokenness, prompting hindrance of the thalamus. The final product is the diminished capacity of the thalamus to initiate the frontal cortex, bringing about the diminished motor movement normal for Parkinson’s disease. The pathophysiology of Parkinson's ailment can be conceptualized at various levels that include: Molecular pathogenesis, Cellular/ Tissue irregularities, Neurochemical changes, Site and circuit brokenness, and Network brokenness. At present, there is just a dubious relationship with hereditary abnormalities that show more worse. Parkinson’s disease is a broad degenerative disease influencing the human central, peripheral, and enteric nervous systems. The fundamental obsessive procedure advances gradually however persistently and includes various neuronal frameworks. The infection is the outcome of changes in the neuronal cytoskeleton creating in just a couple of defenseless kinds of nerve cells. Distressed neurons in the end produce Lewy bodies in their perikarya and Lewy neurites in their neuronal procedures. The range of Lewy body issue incorporates not exclusively Parkinson's infection, dementia with Lewy bodies and Parkinson’s disease related dementia yet additionally Lewy body dysphagia and autonomic disappointment with Lewy bodies [8].

Signs and symptoms

Parkinson’s disease is a debilitating disorder that affects both physical and mental functions of the body. Side effects for the most part grow gradually more than quite a while. It is described by the presence of bradykinesia and any other one different indication, for example, rigidity, resting tremor and postural instability [8]. These motor indications show up when in any at least 50–60% of nigral dopamine neurons, or 60– 80% of their striatal terminals, have vanished. Different pieces of CNS like dorsal motor neuron of Vagus, Nucleus basalis of Mayner, locus ceruleus and Hypothalamus are likewise influenced in any event, reaching out outside CNS like myentric plexus confirm by the presence of Lewy bodies. These highlights represent non motor manifestations like sleep disturbances, depression, psychological impedance, anosmia, clogging, incontinence and ANS dysfunctions. Death of dopamine neurons has been connected to mitochondrial dysfunction, oxidative pressure, nerve aggravation and inadequate autophasic proteosomal degeneration. Numerous medicinal services experts believe tremors to be a key trademark indication of Parkinson’s disease. Tremors include a tireless jerking or shaking of the hands, legs, or jawline. Tremors related with Parkinson's sickness are classified "rest tremors." This implies the tremors stop when an individual uses the influenced body part. Parkinson’s disease is achronic illness that influences the neurological framework and it influences the neurological system, and it influences an individual's capacity to move (motor symptoms ) just as other cerebrum and body work (non-motor indications), both the motor and non-motor symptoms are, (Primay motor indications include)



Postural unsteadiness.


What is more, notwithstanding these 4 essential motor symptoms, there are a few secondary motor indications and these incorporate secondary motor side indications include:

Freezing of gait.


Unwanted increasing velocities.

Speech trouble.



Sexual brokenness.

Non motor indications include:





At a neuroanatomical level, these might be subdivided into cortex (psychosis and subjective impairment), basal ganglia (drive control issue, apathy, and restlessness), brainstem (gloom, nervousness and rest disorders), spinal line (orthostatic hypotension and urological unsettling influences) and the peripheral sensory system (torment and constipation) [9,10]. The essential manifestations of Parkinson's infection are altogether identified with voluntary and noninvoluntary capacity and more often begin on one side of the body. Symptoms are gentle from the outset and will advance after some time. A few people are more influenced than others are. Studies have demonstrated that when that essential manifestations show up, people with Parkinson's malady will have lost 60% to 80% or a greater amount of the dopamine-creating cells in the brain. Specific motor symptoms can be clarified as


Usually tremors happen while resting, and not while including in any work, Trembling in arms, hands, fingers, feet, legs, jaw, or head. Tremors may exacerbate when an individual is energized, tired, or got pushed.


It is the solidness of the appendages and trunk, which may elevate during motion. Inflexibility may create muscle throbs and torment. Loss of fine hand developments can prompt cramped penmanship (micrographia) and may make trouble in eating.


Slowness of voluntary action. After some time, it might wind up hard to start a motion and to finish a motion. Bradykinesia together with solidness can likewise influence the facial muscles and result in a bland, "cover like" appearance.


Impaired or lost reflexes can make it hard to change stance to maintain balance. Postural unsteadiness may prompt falls. While the principle symptoms of Parkinson’s disease are development related, dynamic loss of muscle control and proceeded with harm to the mind can prompt optional symptoms. These secondary indications change in seriousness, and not every person with Parkinson's will encounter every one of them. In the propelled stage patients present with motor confusions, aggravations of the autonomic sensory system and neuropsychiatric issues, for example, wretchedness, anhedonia, lack of care, weakness, or dementia. It is beyond the realm of imagination to expect to avoid Parkinson's malady, yet research has demonstrated that some long-lasting propensities may lessen the hazard. Parkinson's illness is a deep-rooted condition that includes neurological changes in the body. These progressions can make it harder for an individual to work in everyday life. Be that as it may, medicines and different sorts of treatment are accessible for treating Parkinson’s disease and lessening the indication.


The analysis of parkinson’s disease is still to a great extent a clinical one, as there is no authoritative test ready to affirm the finding during life, except for quality testing in a diminished number of cases [11]. Parkinson’s disease is a disease joining clinically characterized parkinsonism with definite pathological findings, to be specific, dopaminergic neuron loss in the locale of substantia nigra standards compacta, just as the presence of intraneuronal Lewy bodies. The clinical finding of Parkinson disease (parkinson’s disease) depends on the distinguishing proof of a blend of the cardinal motor indications of bradykinesia, unbending nature, tremor, and postural instability, however few endeavors have been made to create unequivocal demonstrative criteria [12]. A favourable response to levodopa or dopaminergic agonists is likewise viewed as significant for a solid diagnosis [13].

At the point when conclusion is made utilizing these criteria, it is acknowledged that broad loss of dopaminergic neurons in the substantia nigra (SN) and a noteworthy decrease of striatal dopamine content, have taken place [14]. The commonest alternative diagnosis were Steele-Richardson Olszewski disease (dynamic supranuclear paralysis) and multiple system atrophy (shydrager disorder with autonomic disappointment, striatonigral degeneration, and olivopontocerebellar degeneration in different combination [8]. PET imaging using '8F-dopa and different ligands can separate normal Parkinson’s disease from other parkinsonian disorders in about 80% of cases, yet isn't specific or broadly accessible). MRI has analytic potential in parkinsonism-in addition to syndromes [15]. Magnetic resonance imaging (MRI) is progressively incorporated into neurological diagnostics [16]. Additionally, hereditary testing and different other ancillary tests, for example, olfactory testing, MRI, and dopaminetransporter single-photon-emission computed tomography imaging, CT examine, help with clinical indicative choices [17].


Pharmacotherapy for Parkinson disease are the following

Pharmacological therapy

Dopamine precursors


Levodopa was created as a way to re-establish striatal dopamine levels [18], as the reason for the fundamental motor features of Parkinson’s disease is the loss of dopaminergic neurons of the substantia nigrapars compacta, coming about in striatal dopamine inadequacy. Though the main causative of parkinsonism is due to deficiency in dopamine, as dopamine do not cross the Blood Brain Barrier; levodopa a prodrug which gets coverted to dopamine in the body has been used. levodopa crosses the Blood Brain Barrier and then reaches the central nervous system and then there by stimulates the dopamine receptors and hence produce clinical improvement. Levodopa has been rapidly absorbed by small intestine. Levodopa has improved both the personal satisfaction and future in Parkinson’s disease patients. Its tolerability and adequacy were improved by joining it with a dopa-decarboxylase inhibitor. Clinical examinations have shown that consistent dopaminergic incitement may expand the helpful window for levodopa and improve motor fluctuations [19]. Systems for giving continues dopaminergic substitution incorporate organization of levodopa by consistent infusion, controlled-release levodopa, long-acting dopamine agonists, and inhibitors of levodopa metabolism. Due to pharmacodynamic and pharmacokinetic attributes of these medications. A few creators propose the utilization of levodopa as a first line of treatment in all patients with Parkinson’s disease (aside from youthful), especially for those with genuine subjective or motor hindrances that altogether interfere with everyday living [20]. In youthful patients appear to have a slower movement of the malady, they are at a higher hazard for creating levodopa incited complications, for example, motor vacillations and dyskinesia [21]. Adverse impacts of levodopa treatment additionally incorporate; nausea, hypotension, solid unbending nature, and psychosis, among others [22].


Carbidopa is a peripheral dopa decarboxylase inhibitor, it prevents peripheral destruction of levodopa; the combination is synergistic and, hence levodopa is always given with carbidopa. Side effects like vomiting and tachycardia are largely reduced. Levodopa dose can be reduced up to about 75%. Carbidopa is a medication that stops change of levodopa to dopamine outside of focal sensory system (CNS) and accordingly inhibits undesirable symptoms of levodopa on organs situated outside of CNS during the executives of Parkinson's disease [23]. Carbidopa is recorded as a decarboxylase inhibitor and is sold in the US. It is administered in mix with levodopa to ease nausea [24].

Dopamine agonists

Nervous system specialists have a few options of medications that have been demonstrated to be viable for the treatment of the symptoms of Parkinson’s disease. Among the main choices are the dopamine agonists, which are normally utilized both as an early monotherapy and as an extra treatment to levodopa [25]. Dopamine agonists (DA) are substance that connect to dopamine receptors without the endogenous synapse dopamine [26]. Dopamine agonists incorporate ergot derivatives, for example, bromocriptine, lisuride, pergolide, and cabergoline and different specialists which do not have the ergot structure, for example, pramipexole and ropinirole. They all are powerful stimulators of the D2 dopamine receptor which likely underlies their therapeutic effects. The clinical results of their binding to other dopamine receptor subtypes (D1 or D3) remains unknown [27]. They are typically endorsed in mix with levodopa when late reactions start to happen. Highlight that DA treatment yields no outcomes in patients who are inert to L-DOPA. As far as DA, more up to date expanded discharge plans have indicated preferred wellbeing profiles for patients over prompt discharge ones [28]. DA are generally separated into two types: ergoline-and non-ergoline-determined agonists [29]. Ergoline agonists are the original of DA, got from ergot, and are related with explicit dangers of peritoneal, aspiratory, and cardiovascular/valvular fibrosis [30]. The normal medications in ergoline class are bromocriptine, cabergoline, pergolide, and lisuride. However, ergot-determined das are commonly occasionally utilized nowadays because of their built-up danger of valvular and lung fibrosis [31]. For the dopamine agonists, the accessible proof on their symptomatic viability, impact on long term levodopa-related motor confusions, putative impact on progression of disease, and adverse event occasion profile must be considered.

Ergoline-derived dopamine agonists

Ergoline-derived dopamine agonists mainly include Bromocriptine, Pergolide, Cabergoline, Lisuride and Cabergoline.


Bromocriptine is a solid agonist of D2 (D2>D3>D4) class of dopamine receptors, utilized in assistant treatment with L-DOPA and as a monotherapy to defer the foundation of L-DOPA and limit vacillations of engine manifestations [32-34]. Symptoms that are regularly connected with bromocriptine are orthostatic hypotension, cerebral pain, sickness, and regurgitating [35]. Drive control issue (icds) have likewise been related with the organization of bromocriptine [36].


Pergolide has been utilized as a useful and wellendured monotherapy for early parkinson’s disease [37]. Pharmacologically it goes about as an agonist of the D2 and D1 dopamine and 5-HT1 and 5-HT2 groups of serotonin receptors. Also, the pergolide treatment was related with an expansion in pulmonary artery pressure (PAP) [38]. Because of this, pergolide was expelled from the US market by the Federal Drug Administration in 2007, although it is yet utilized globally.


Cabergoline is an orally accessible, long-acting t1/2 = 80 h) D2 dopamine receptor agonist that additionally applies an agonistic impact on D3, D4 and 5-HT2 group of receptors. What is more, this medication antagonist 5-HT 7 and α2b receptors. Because of its long half-life, cabergoline is helpfully regulated in a "once per day" design and it essentially defers the onset of motor complications [39]. Cabergoline can be utilized to lessen levodopa portion and newly improve motor debilitation and incapacity with a satisfactory adverse occasion profile [40]. The side effects predominantly dose dependent incorporate moderate to extreme valvular Regurgitation [41].


Lisuride has been appeared as a compelling assistant to l-dopa in early Parkinson’s disease treatment. The utilization of lisuride and l-dopa consolidated diminished the occurrence of dyskinetic and unusual motor symptoms in the early [42], just as in the propelled phases of parkinson’s disease [43]. Lisuride is a strong D2, D3, and D4 dopamine receptor agonist, yet in addition follows up on 5-ht1a and 5-ht2a/c serotonin receptors [44]. During consolidated treatment with lisuride and levodopa the day by day portion of levodopa required for ideal helpful reaction was essentially lower than when utilizing levodopa alone. Serious dopaminergic adverse events prompting withdrawal of the treatment were usual during treatment with lisuride and levodopa than with levodopa alone, yet the lower death rate didn't arrive at the degree of statistical significance. It appears to be sensible to consider a treatment methodology in early Parkinson’s disease utilizing a dopamine agonist, as lisuride, as the essential treatment and to postpone the addition of levodopa until parkinsonian disability can't be enough constrained by a dopamine agonist [45]. The most-basic symptoms were dry mouth, sickness, postural hypotension, and migraine, and that a large portion of these vanished in three to four days [46].

Non-ergoline dopamine agonists


Pramipexole applies a strong agonistic impact on the D2-group of dopamine receptors with special fondness toward D3 receptors [47]. It produces useful impacts in beginning times of Parkinson’s disease, fundamentally decreases dyskinesia [48,49]. Pramipexole is sheltered and powerful as present moment monotherapy in patients with early parkinson’s disease who are not getting levodopa [50]. Archived side effects of pramipexole incorporate sleep attacks [51], drowsiness (up to 57 percent of patients in a single report) [52], and nausea. A role of pramipexole in causing ICD has been recommended, and an ongoing report demonstrated that 32 percent of parkinson’s disease patients that were treated with pramipexole [53]. as an extra agonist showed ICD symptomatology. This impact is related with D3 stimulation [54-56]. Other noted side effects were stoppage, visual/sound-related hallucinations, and impulsive eating and weight gain [57,58]. The last makes it a decent choice for those patients who create mental indications of discouragement while experiencing Parkinson disease [59].


Ropinirole is a dopamine receptor agonist with the most elevated affinity for D2, and after that for D3 and D4 receptors [60]. It is a feasible treatment choice for beginning periods of Parkinson’s disease [61].

So also to pramipexole, ropinirole has been related with ICD (present among 25 percent of patients that utilized it as an extra agonist). Other side effects of ropinirole incorporate nausea, obstruction, unsteadiness, drowsiness, dyskinesia, hallucination, and orthostatic hypotension [62,63]. The investigations demonstrate that ropinirole was more successful than placebo in improving motor function and activities of everyday living when utilized as a subordinate to levodopa in patients with advanced Parkinson’s disease [64].


Piribedil is a piperazine-determined medication that creates an agonistic impact on D2 and D3 dopamine receptors and antagonistic impact on α2 receptors [65,66]. Results of the recover study demonstrated that piribedil is powerful and safe in early parkinson’s disease treatment [67]. It has been involved in impulse control issue [68,69], just as an abrupt beginning of sleep attacks [70]. As far as circulatory impacts, piribedil can deliver vasodilatation due to α2 adrenolytic movement, a thoughtful reflex increment of pulse, plasma renin, and aldosterone levels [71]. Because of the majority of this, symptoms, for example, orthostatic hypotension or potentially syncope are possible.


Apomorphine is a solid non-ergoline D1 and D2 class receptor agonist that is for the most part utilized for "off" dyskinetic scenes that happen because of L-DOPA treatment [72]. It can be directed through subcutaneous infusion or intermittent inject [73]. Apomorphine has emetic properties and can likewise prompt hypotension that isn't midway mediated [74]. The normal side effects related with apomorphine are migraine, sickness, dizziness [75], postural instability [76], injection site responses, and mental issues [77].

The presentation of domperidone effectively antagonizes peripheral and cardiovascular dopamine impacts of apomorphine [78,79].


Rotigotine is a distinct DA as in it is controlled by means of transdermal fix [80]. This element empowers a consistent and effective supply of the medication inside 24 hours [81]. It likewise has valuable antidepressant properties, making it is a sensible treatment choice in instances of depressed Parkinson’s disease patients [82]. Application site responses are regular with rotigotine (44 percent versus 12 percent fake treatment) [83]. A direct correlation with ropirinole in advanced stage parkinson’s disease demonstrated that rotigotine had comparative efficacy to ropinirole at dosages up to 16 mg/24 h, in spite of the fact that application site responses were a lot higher in the rotigotine gathering (57.7 percent versus 18.6 percent) [84]. The most widely recognized side effectswere applicationsite responses, nausea, and somnolence [85].

CO-MT inhibitors

The catechol-O-methyltransferase inhibitors that block a compensatory metabolic pathway for levodopa and delay its span may improve the consistency of the dopaminergic reaction. Levodopa is the best treatment in Parkinson's ailment and the relationship with COMT inhibitors broadens its plasma bioavailability and efficacy. Catechol-O-methyltransferase (COMT) is a ubiquitous enzyme that separates levodopa before it may be changed over to DA, just as DA itself [86]. COMT inhibitors extend the accessibility of a unit dose of levodopa, without, lagging the onset of its effects, oftentimes diminishing the total sum, of levodopa required. The present, sign for COMT inhibition is as an adjunctive treatment to levodopa in advanced parkinson’s disease patients who have created wearing off or "on-off" fluctuations [87]. However, COMT treatment in the previous phases of parkinson’s disease may likewise be advantageous by preventing or lagging motor complications. Two COMT inhibitors have been broadly tried up until: Tolcapone and entacapone.

MAO-B inhibitors

MAO-B inhibitors have a great pharmacokinetic profile, improve the dopamine insufficient state and may have neuroprotective properties [88].

MAOB inhibitors, selegiline and rasagiline, have been verified widely for disease change in parkinson’s disease [89]. Selegiline is an irreversible MAO-B inhibitor and has been accessible for more than 30 years in the treatment of motor indications in early and late stage of parkinson’s disease. Rasagiline is in like manner a strong irreversible MAO-Binhibitor all the more as of late presented and seriously studied for use in early and propelled Parkinson’s disease [90]. Safinamide is a reversible MAO-B inhibitor that likewise has extra activities in diminishing dopamine reuptake and glutamate release and is as of now experiencing stage III clinical preliminaries.


Selegiline (N-Propargyl-methamphetamine) is a specific, irreversible MAOB inhibitor at therapeutic dose of 10 mg/day, however, loses its selectivity at more noteworthy measurements [91]. Selegiline is a subsidiary of methamphetamine and is metabolised to L-amphetamine-like metabolites which can cause sympathomimetic reactions, for example, insomnia [92]. As an extra to levodopa treatment, selegiline can diminish motor fluctuations [93]. Selegiline lags the progression of the signs and manifestations of Parkinson disease [94]. The early combined treatment of selegiline and levodopa contrasted with levodopa monotherapy has an increasingly likely effect on the long term day by day levodopa dose and may conceivably lag the advancement of disability in parkinson’s disease [95].


Rasagiline (N-propargyl-1-(R)- aminoindan) is a second era propargylamine-based, irreversible MAOB inhibitor. Rasagiline totally and specifically inhibits MAO-B with an intensity 5 to multiple times more noteworthy than selegiline [96]. Rasagiline is accessible in 0.5 mg and 1 mg tablets and is taken once daily [97].

Anticholinergic medications

Anticholinergic medications have a moderate effect in diminishing tremor however do not have any huge advantage upon bradykinesia. The cholinergic overactivity is over comed by anticholinergics, they block the muscarinic receptors in the striatum. Atropine derivatives like biperidin, procyclidinde, benzhexol and benzotropine are commonly used. These ate used as adjuncts to levodopa and as drugs of choice in drug induced parkinsonism. The utilization of the anticholinergic specialists have been declined in view of the expanded symptoms such as, constipation, urinary maintenance, psychological impairment, in chose more youthful patients these are still powerful yet ought to be under close monitoring. Amantadine also produces anticholinergic effects.

Other drugs

Amantadine has been utilized for the treatment of Parkinson’s disease for quite a few years, even though its mechanism of action is obscure [98,99]. Recently, it was appeared to work by reducing N-methyl-D-aspartate (NMDA) receptors and saw as powerful in inhibiting dyskinesias [100,101]. Memantinc, a related medication, additionally works as a neuroprotective through this mechanism. Memantine is utilized in Germany as an antispastic medication and furthermore to treat dementia and is by and by being assessed for its adequacy in Parkinson’s disease, based on fundamental results [102]. The antiglutamatergic impact of amantadine and memantine likewise proposes a neuroprotective activity, and memantine is presently effectively advanced in alzimer disease.

Non-Pharmacological Theraphy

Nonpharmacological treatment systems in Parkinson' disease incorporate heterogeneous treatment modalities, for example, physiotherapy, speech therapy, language training, subjective preparing and noninvasive brain stimulation techniques. Thalamotomy, Subthalamotomy, pallidotomy and deep brain stimulation are the fundamental careful methodologies for the treatment of Parkinson’s disease. Those surgical treatment procedures in details are:


These are rarely used; still can be used in severe tremor on a side that can`t be relieved by medications. During this procedure, a part of the brain called thalamus is being destroyed, by damaging this the condition can be relieved. A thalamotomy is performed on the contralateral side of the brain to where the person has the worst motor symptoms.


Performed very rarely now a days it’s a surgical procedure in which a small portion of the brain called subthalamic nucleus is destroyed to relieve the motor symptoms of parkinsonism and these have been done only on one side of the brain.


Pallidotomy is a surgical procedure in which a part of the brain called globus pallidus is destroyed. In people with parkinsonism there is an abundance of activity in the globus pallidus and creating scar in this portion of the brain reduces the activity and may help recover the symptom.

Deep brain stimulation

This is a procedure in which a device is implanted in the person to deliver electrical pulses to the brain to decrease motor symptoms of Parkinson disease. The electrical impulses are targeted to the areas of the brain that control movement to block abnormal signals that produce symptoms like tremor. The areas targeted include, thalamus, subthalamus and pallidus [103-104].


Parkinson disease is a neurodegenerative disease, mainly characterised by the movements of the body. There involves many theories and researches along the causes of the disease and finally it’s found out to be not a single cause, there are multiple factors that causes the disease. The main cause of the parkinson disease is the deficiency of dopamine, this can be likewise medication instigated, the principle medications included being those that decrease the measure of dopamine in the brain. The major indications include bradykinesia, rigidity, resting tremor, and postural instability; these motor indications show up when in any at least 50-60% of niagral dopamine neurons, or 60- 80% of their striatal terminals, have vanished. And the absolute cause is still unknown. In this article we have discussed about, what parkinson disease is, its causes, pathophysiology and the management for Parkinson’s disease. It includes both pharmacological and nonpharmacological therapy with its adverse effects. The management of Parkinson`s disease includes the pharmacological therapy which are the Dopamine precursors(levodopa and carbidopa), Dopamine agonists (bromocriptine, pergolide, pramipexole, apomorphine etc..), COMT inhibitors, MAO-B inhibitors (selegiline and rasagiline), anti-cholinergics and other drugs. The non-pharmacological therapy includes physiotherapy, speech therapy and surgical treatments such as thalamotomy, pallidotomy, deep brain stimulation. Lifestyle change give a better result to the Parkinson’s patients.


Author Info

Raghu S1*, Kothai R2 and Sankar V2

1Vinayaka Mission’s College of Pharmacy, Yearcaud Main Road Kondappanaikanpatty, Salem, Tamilnadu, India
2Department of Pharmacology Srinivasan College of Pharmaceutical Sciences Samayapuram, Tamilnadu, India

Citation: Raghu S, Kothai R, Sankar V, Parkinsonâ??s Disease-Review, J Res Med Dent Sci, 2020, 8 (6): 113-124.

Received: 05-Aug-2020 Accepted: 17-Sep-2020