Ropinirole

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Ropinirole
Ropinirole Structural Formulae.svg Ropinirole ball-and-stick model.png
Systematic (IUPAC) name
4-[2-(Dipropylamino)ethyl]-1,3-dihydro-2H-indol-2-one
Clinical data
Trade names Requip
AHFS/Drugs.com monograph
MedlinePlus a698013
Pregnancy
category
  • C
Legal status
  • ℞ (Prescription only)
Routes of
administration
Oral
Pharmacokinetic data
Bioavailability 50%[1]
Metabolism Hepatic (CYP1A2)[1]
Biological half-life 5-6 hours[1]
Identifiers
CAS Number 91374-21-9 YesY
ATC code N04BC04 (WHO)
PubChem CID: 5095
IUPHAR/BPS 7295
DrugBank DB00268 YesY
ChemSpider 4916 YesY
UNII 030PYR8953 YesY
KEGG D08489 YesY
ChEBI CHEBI:8888 YesY
ChEMBL CHEMBL589 YesY
Chemical data
Formula C16H24N2O
Molecular mass 260.375 g/mol
  • O=C2Nc1cccc(c1C2)CCN(CCC)CCC
  • InChI=1S/C16H24N2O/c1-3-9-18(10-4-2)11-8-13-6-5-7-15-14(13)12-16(19)17-15/h5-7H,3-4,8-12H2,1-2H3,(H,17,19) YesY
  • Key:UHSKFQJFRQCDBE-UHFFFAOYSA-N YesY
  (verify)

Ropinirole (INN; trade names Requip, Repreve, Ronirol, Adartrel) is a dopamine agonist of the non-ergoline class of medications. It is manufactured by GlaxoSmithKline (GSK), Cipla, Dr. Reddy's Laboratories and Sun Pharmaceutical. It is used in the treatment of Parkinson's disease and restless legs syndrome (RLS). Ropinirole is one of three medications approved by the FDA to treat RLS, the other two being pramipexole (Mirapex) and gabapentin enacarbil (Horizant). The discovery of the drug's utility in RLS has been used as an example of successful drug repurposing.[2]

Ropinirole's patent expired in May 2008, and the drug is now available in generic form.[3]

Medical uses

Ropinirole is prescribed for mainly Parkinson's disease, RLS and extrapyramidal symptoms. It can also reduce the side effects caused by selective serotonin reuptake inhibitors, including Parkinsonism syndrome as well as sexual dysfunction and erectile dysfunction caused by either SSRIs[4] or antipsychotics.

Dosage

Ropinirole in the Requip form is available in various preparations, ranging from a 0.25 mg tablet to a 5 mg tablet. The primary reason is dose titration. This implies that the person taking Requip has to closely interact and communicate with the primary care physician with regard to how much should actually be taken by the patient.

For Parkinson's disease, the maximum recommended dose is 24 mg per day, taken in three separate doses spread throughout the day. The maximum dose recommendations of ropinirole for subjects with end stage renal disease (ESRD) should be reduced by 25% compared with those recommended for subjects with normal renal function. A 25% dose reduction represents a more straightforward dosage regimen in terms of available tablet strength, compared with a 30% dose reduction.[5]

For RLS, the maximum recommended dose is 4 mg per day, taken 1 to 3 hours before bedtime. A 52-week open label study had a mean dosage of 1.90 mg, once daily 1 to 3 hours before bedtime.[6]

Pharmacology

Ropinirole acts as a D2, D3, and D4 dopamine receptor agonist with highest affinity for D2. It is weakly active at the 5-HT2, and α2 receptors and is said to have virtually no affinity for the 5-HT1, GABA, mAChRs, α1, and β-adrenoreceptors.[7]

Ropinirole is metabolized primarily by cytochrome P450 CYP1A2 to form two metabolites; SK&F-104557 and SK&F-89124, both of which are renally excreted,[5] and at doses higher than clinical, is also metabolized by CYP3A4. At doses greater than 24 mg, CYP2D6 may be inhibited, although this has only been tested in vitro.[1]

Side effects

Ropinirole can cause nausea, dizziness, hallucinations, orthostatic hypotension, and sudden sleep attacks during the daytime. Unusual side effects specific to D3 agonists such as ropinirole and pramipexole can include hypersexuality, punding and compulsive gambling, even in patients without a history of these behaviours.[8]

Lawsuits

In November 2012, GlaxoSmithKline was ordered by a Rennes appeals court to pay Frenchman Didier Jambart 197,000 euros ($255,824); Jambart had taken ropinirole from 2003 to 2010 and exhibited risky hypersexual behavior and gambled excessively until stopping the Parkinson's treatment.[9]

See also

References

  1. 1.0 1.1 1.2 1.3 Lua error in package.lua at line 80: module 'strict' not found.
  2. Lua error in package.lua at line 80: module 'strict' not found. Note: The opinion that ropinirole's use in RLS was a successful example of drug repurposes was reported as being that of Josef Scheiber, a post-doctoral fellow at the Novartis Institutes for BioMedical Research.
  3. New pharmaceutical products: Ceftriaxon-Rocephin, Granisetron-Kytril, Ipratropium-Albuterol
  4. Clinical trial number NCT00334048 at ClinicalTrials.gov - "Treating Sexual Dysfunction From SSRI Medication: a Study Comparing Requip CR to Placebo"
  5. 5.0 5.1 An open-label, parallel-group, repeat-dose study to investigate the effects of end-stage renal disease and haemodialysis on the pharmacokinetics of ropinirole | Authors: Debra J. Tompson, Deborah Hewens, Nancy Earl, David Oliveira, Jorg Taubel, Suzanne Swan, Luigi Giorgi | 13th International Congress of Parkinson’s Disease and Movement Disorders, Paris, France, June 7–11, 2009
  6. Lua error in package.lua at line 80: module 'strict' not found.
  7. Lua error in package.lua at line 80: module 'strict' not found.
  8. Lua error in package.lua at line 80: module 'strict' not found.
  9. Lua error in package.lua at line 80: module 'strict' not found.

External links