Pramipexole

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Pramipexole
File:Pramipexole.svg
Systematic (IUPAC) name
(S)-N6-propyl-4,5,6,7-tetrahydro-1,3-benzothiazole-2,6-diamine
Clinical data
Pregnancy
category
  • AU: B3
  • US: C (Risk not ruled out)
Routes of
administration		 Oral
Legal status
Legal status
  • ℞ (Prescription only)
Pharmacokinetic data
Bioavailability >90%
Protein binding 15%
Biological half-life 8-12 hours
Excretion Urine (90%), Feces (2%)
Identifiers
CAS Number 104632-26-0
ATC code N04BC05 (WHO)
PubChem CID 59868
DrugBank APRD00156
Chemical data
Formula C10H17N3S
Molar mass 211.324 g/mol[[Script error: No such module "String".]]
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Pramipexole (Mirapex, Mirapexin, Sifrol) is a non-ergoline dopamine agonist indicated for treating early-stage Parkinson's disease (PD) and restless legs syndrome (RLS).[1] It is also sometimes used off-label as a treatment for cluster headache and to counteract the problems with sexual dysfunction experienced by some users of the selective serotonin reuptake inhibitor (SSRI) antidepressants.[2] Pramipexole has shown robust effects on pilot studies in a placebo-controlled proof of concept study in bipolar disorder.[3] It is also being investigated for the treatment of clinical depression and fibromyalgia.[4][5][6]

Pharmacology

Pramipexole acts as a partial/full agonist at the following receptors:[7][8]

Pramipexole also possesses low/insignificant affinity (500-10,000 nM) for the 5-HT1A, 5-HT1B, 5-HT1D, and α2-adrenergic receptors.[7][9] It has negligible affinity (>10,000 nM) for the D1, D5, 5-HT2, α1-adrenergic, β-adrenergic, H1, and mACh receptors.[7][9] All sites assayed were done using human tissues.[7][8]

Parkinson's disease is a neurodegenerative disease affecting the substantia nigra, a component of the basal ganglia. The substantia nigra has a high quantity of dopaminergic neurons, which are nerve cells that release the neurotransmitter known as dopamine. When dopamine is released, it may activate dopamine receptors in the striatum, which is another component of the basal ganglia. When neurons of the substantia nigra deteriorate in Parkinson's disease, the striatum no longer properly receives dopamine signals. As a result, the basal ganglia can no longer regulate body movement effectively and motor function becomes impaired. By acting as an agonist for the D2, D3, and D4 dopamine receptors, pramipexole may directly stimulate the underfunctioning dopamine receptors in the striatum, thereby restoring the dopamine signals needed for proper functioning of the basal ganglia.

Side effects

Common side effects of pramipexole may include:[10][11]

Several unusual adverse effects of pramipexole (and related D3-preferring dopamine agonist medications such as ropinirole) may include compulsive gambling, hypersexuality, and overeating,[12] even in patients without any prior history of these behaviours.[13] Other compulsive behaviors, such as excessive shopping and even cross-dressing, have been reported.[14] These side effects are thought to be linked to the D3 activity of pramipexole, as D3 receptors are heavily expressed in brain regions involved in mood, behavior, and reward.[15]

Chemistry

Pramiprexole can be synthesized from a cyclohexanone derivative by the following route:[16] 600px

See also

References

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External links

Dopaminergics
Anticholinergics
Others
Urologicals, including antispasmodics (G04B)
Acidifiers
Urinary antispasmodics
(primarily antimuscarinics)
For erectile dysfunction
Others
Other urologicals
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  1. ↑ National Prescribing Service (2009). "Pramipexole for Parkinson's Disease". Medicines Update. Available at http://www.nps.org.au/consumers/publications/medicine_update/issues/Pramipexole_for_Parkinsons_disease
  2. ↑ DeBattista C, Solvason HB, Breen JA, Schatzberg AF. (2000). "Pramipexole augmentation of a selective serotonin reuptake inhibitor in the treatment of depression". J Clin Psychopharmacol. 20 (2): 274–275. doi:10.1097/00004714-200004000-00029. PMID 10770475. 
  3. ↑ Biol Psychiatry. 2004 Jul 1;56(1):54-60. Pramipexole for bipolar II depression: a placebo-controlled proof of concept study.Zarate CA Jr, Payne JL, Singh J, Quiroz JA, Luckenbaugh DA, Denicoff KD, Charney DS, Manji HK.PMID: 15219473
  4. ↑ Lattanzi L, Dell'Osso L, Cassano P, Pini S, Rucci P, Houck PR, Gemignani A, Battistini G, Bassi A, Abelli M, Cassano GB. (2002). "Pramipexole in treatment-resistant depression: a 16-week naturalistic study". Bipolar Disord. 4 (5): 307–314. doi:10.1034/j.1399-5618.2002.01171.x. PMID 12479663. 
  5. ↑ Cassano P, Lattanzi L, Soldani F, Navari S, Battistini G, Gemignani A, Cassano GB. (2004). "Pramipexole in treatment-resistant depression: an extended follow-up". Depress Anxiety. 20 (3): 131–138. doi:10.1002/da.20038. PMID 15549689. 
  6. ↑ Holman AJ, Myers RR. (2005). "A randomized, double-blind, placebo-controlled trial of pramipexole, a dopamine agonist, in patients with fibromyalgia receiving concomitant medications". Arthritis Rheum. 52 (8): 2495–2505. doi:10.1002/art.21191. PMID 16052595. 
  7. ↑ 7.0 7.1 7.2 7.3 Lua error in package.lua at line 80: module 'Module:Citation/CS1/Suggestions' not found.
  8. ↑ 8.0 8.1 Lua error in package.lua at line 80: module 'Module:Citation/CS1/Suggestions' not found.
  9. ↑ 9.0 9.1 Lua error in package.lua at line 80: module 'Module:Citation/CS1/Suggestions' not found.
  10. ↑ "MedlinePlus Drug Information: Pramipexole (Systemic)". United States National Library of Medicine. Retrieved 2006-09-27. 
  11. ↑ "FDA Prescribing Information: Mirapex (pramipexole dihydrochloride)" (PDF). Food and Drug Administration (United States). Retrieved 2008-12-31. 
  12. ↑ Wolters ECh, van der Werf YD, van den Heuvel OA. Parkinson's disease-related disorders in the impulsive-compulsive spectrum. Journal of Neurology. 2008 Sep;255 Suppl 5:48-56. PMID 18787882
  13. ↑ Bostwick JM, Hecksel KA, Stevens SR, Bower JH, Ahlskog JE. Frequency of new-onset pathologic compulsive gambling or hypersexuality after drug treatment of idiopathic Parkinson disease. Mayo Clinic Proceedings. 2009 Apr;84(4):310-6. PMID 19339647
  14. ↑ USA Today, Not Your Ordinary Side Effects, May 23, 2006
  15. ↑ Lua error in package.lua at line 80: module 'Module:Citation/CS1/Suggestions' not found.
  16. ↑ Schneider, Claus S.; Mierau, Joachim (1987). "Dopamine autoreceptor agonists: resolution and pharmacological activity of 2,6-diaminotetrahydrobenzothiazole and an aminothiazole analog of apomorphine". Journal of Medicinal Chemistry. 30 (3): 494. doi:10.1021/jm00386a009. PMID 3820220. 
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