medicine: rivastigmine

rivastigmine description

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Rivastigmine (sold under the trade name Exelon) is a parasympathomimetic or cholinergic agent for the treatment of mild to moderate dementia of the Alzheimer’s type and dementia due to Parkinson's disease. The drug can be administered orally or via a transdermal patch; the latter form reduces the prevalence of side effects, which typicaly include nausea and vomiting. The drug is eliminated through the urine, and appears to have relatively few drug-drug interactions.

History

Rivastigmine was developed by Novartis, and has been available in capsule and liquid formulations since 1997. In 2006, it became the first product approved globally for the treatment of mild to moderate dementia associated with Parkinson's Disease; and in 2007 the rivastigmine transdermal patch became the first patch treatment for dementia.

Administration

Rivastigmine tartrate is a white to off-white fine crystalline powder that is both lipophilic (soluble in fats) and hydrophilic (soluble in water). Like other cholinesterase inhibitors, it requires doses to be increased gradually over several weeks; this is usually referred to as the titration phase. Oral doses of rivastigmine should be titrated with a 3 mg per day increment every 2 to 4 weeks.

Rivastigmine is classified as Pregnancy category B, with insufficient data on risks associated with breastfeeding. In cases of overdose, atropine is used to reverse bradycardia. Dialysis is ineffective due to the drug's half-life.

Pharmacodynamics

Rivastigmine is a cholinesterase inhibitor that inhibits both butyrylcholinesterase and acetylcholinesterase (unlike donepezil, which selectively inhibits acetylcholinesterase). It is thought that rivastigmine works by inhibiting these cholinesterase enzymes, which would otherwise break down the brain chemical acetylcholine.

Indication

The U.S. Food and Drug Administration has approved rivastigmine capsules and the rivastigmine patch for the treatment of mild to moderate dementia of the Alzheimer’s type and for mild to moderate dementia related to Parkinson's disease. It has been used in more than 6 million patients world-wide.

Rivastigmine has demonstrated significant treatment effects on the cognitive (thinking and memory), functional (activities of daily living) and behavioural problems that are commonly associated with Alzheimer’s and Parkinson's disease dementias.

Efficacy

In patients with either type of dementia, rivastigmine has been shown to provide meaningful symptomatic effects that may allow patients to remain independent and ‘be themselves’ for longer. In particular, rivastigmine appears to show marked treatment effects in patients showing a more aggressive course of disease, such as those with a younger age of onset, a poor nutritional status, or those experiencing symptoms such as delusions or hallucinations. For example, the presence of hallucinations appears to be a predictor of especially strong responses to rivastigmine, both in Alzheimer’s and Parkinson's disease patients. It has been proposed that these effects might reflect the additional inhibition of butyrylcholinesterase, which is implicated in symptom progression and might provide added benefits over acetylcholinesterase-selective drugs in some patients. Multi-infarct dementia—may be slight improvement in executive functions and behaviour. There are no firm evidences supporting usage in schizophrenia patients.

Its efficacy is similar to donepezil and tacrine. Doses below 6 mg/d may be ineffective. The effects of this kind of drugs in different kinds of dementia (including Alzheimer's dementia) are modest, and it is still unclear which AcCh(ButCh) esterase inhibitor is better in Parkinson's dementia, though rivastigmine is well-studied.

Side effects

Side effects may include nausea and vomiting.

It has been postulated that the strong potency of rivastigmine, provided by its dual inhibitory mechanism, leads to more nausea and vomiting during the titration phase of oral rivastigmine treatment. This enforces the importance of taking oral forms of these drugs as prescribed with food. However, rates of nausea and vomiting are markedly reduced with the once-daily rivastigmine patch (which can be applied at any time of the day, with or without food).

In a large clinical trial of the rivastigmine patch in 1,195 patients with Alzheimer’s disease, the target dose of 9.5 mg/24 hour patch provided similar clinical effects (e.g. memory and thinking, activities of daily living, concentration) as the highest doses of rivastigmine capsules, but with three times fewer reports of nausea and vomiting. .

Pharmacokinetics

When given orally, rivastigmine is well absorbed with a bioavailability of about 40% in the 3 mg dose. Pharmacokinetics are linear up to 3 mg BID but non-linear at higher doses. Elimination is through the urine. Peak plasma concentrations are seen in about one hour, with peak CSF concentrations at 1.4–3.8 hours. When given by once-daily transdermal patch, the pharmacokinetic profile of rivastigmine is much smoother, compared with capsules, with lower peak plasma concentrations and reduced fluctuations. The 9.5 mg/24 h rivastigmine patch provides comparable exposure to 12 mg/day capsules (the highest recommended oral dose).

The compound does cross the blood-brain barrier. Plasma protein binding is 40%. The major route of metabolism for rivastigmine is by its target enzymes via cholinesterase-mediated hydrolysis. Elimination bypasses the hepatic system so hepatic cytochrome P450 (CYP) isoenzymes are not involved. It has been suggested that this means there is a low potential for drug-drug interactions (which could lead to adverse effects) between rivastigmine and the many common drugs that use the cytochrome P450 metabolic pathway.

See also

Dimebon
memantine
Proteopedia 1gqr

Notes

^ Winblad B, Grossberg G, Frolich L, Farlow M, Zechner S, Nagel J, Lane R. “IDEAL: a 6-month, double-blind, placebo-controlled study of the first skin patch for Alzheimer disease”. Neurology 2007 Jul 24;69(4 Suppl 1):S14–22. PMID 17646619
^ Inglis F. “The tolerability and safety of cholinesterase inhibitors in the treatment of dementia”. Int J Clin Pract. 2002;(127):45–63. PMID 12139367
^ Novartis Pharmaceuticals Corporation “Exelon Product Insert” June 2006. [1]
^ “FDA Approves the First Treatment for Dementia of Parkinson’s Disease” U.S. FDA News Release [2]
^ Camps P. Munoz-Torrero D. “Cholinergic drugs in pharmacotherapy of Alzheimer's disease”. Mini Rev Med Chem. 2002 Feb;2(1):11–25. PMID 12369954
^ Corey-Bloom J, Anand R, Veach J. “A randomized trial evaluating the efficacy and safety of ENA 713 (rivastigmine tartrate), a new acetylcholinesterase inhibitor, in patients with mild to moderately severe Alzheimer’s disease”. Int J Geriatr Psychopharmacol. 1998;1:55–65.
^ Rösler M, Anand R, Cicin-Sain A, et al. “Efficacy and safety of rivastigmine in patients with Alzheimer’s disease: international randomised controlled trial”. Br Med J. 1999;318:633–640. PMID 10066203
^ Finkel SI. “Effects of rivastigmine on behavioral and psychological symptoms of dementia in Alzheimer's disease”. Clin Ther. 2004;26:980–990. PMID 15336465
^ Rosler M, Retz W, Retz-Junginger P, Dennler HJ. ”Effects of two-year treatment with the cholinesterase inhibitor rivastigmine on behavioural symptoms in Alzheimer's disease”. Behav Neurol. 1998;11(4):211–216. PMID 11568422
^ Emre M, Aarsland D, Albanese A, et al. “Rivastigmine for dementia associated with Parkinson’s disease”. N Engl J Med. 2004;351:2509–2518. PMID 15590953
^ Gauthier S, Vellas B, Farlow M, Burn D. “An aggressive course of disease in dementia”. Alzheimer's & Dementia 2006;2:210–17.
^ Touchon J, Bergman H, Bullock R, Rapatz G, Nagel J, Lane R. Response to rivastigmine or donepezil in patients with Alzheimer’s disease and symptoms suggestive of concomitant Lewy body pathology. Curr Med Res Opin 2006;22:49–59. PMID 16393430
^ Burn D, Emre M, McKeith I, et al. “Effects of rivastigmine in patients with and without visual hallucinations in dementia associated with Parkinson's disease”. Mov Disord. 2006;21:1899–1907. PMID 16960863
^ Gauthier S, Vellas B, Farlow M, Burn D. “An aggressive course of disease in dementia”. Alzheimer's & Dementia 2006;2:210–17.
^ Touchon J, Bergman H, Bullock R, Rapatz G, Nagel J, Lane R. Response to rivastigmine or donepezil in patients with Alzheimer’s disease and symptoms suggestive of concomitant Lewy body pathology. Curr Med Res Opin 2006;22:49–59. PMID 16393430
^ Cummings J, Lefevre G, Small G, Appel-Dingemanse S. “Pharmacokinetic rationale for the rivastigmine patch”. Neurology. 2007 Jul 24;69(4 Suppl 1):S10–3. PMID 17646618
^ Jann MW, Shirley KL, Small GW. “Clinical pharmacokinetics and pharmacodynamics of cholinesterase inhibitors”. Clin Pharmacokinet. 2002;41(10):719–739. PMID 12162759
^ Jann MW. “Rivastigmine, a new-generation cholinesterase inhibitor for the treatment of Alzheimer's disease”. Pharmacotherapy. 2000 20(1):1–12. PMID 10641971.
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InhibitorsPlasmalemmalCHT InhibitorsHemicholinium-3 (Hemicholine)VesicularVAChT InhibitorsVesamicolEnzyme
InhibitorsAnabolismChAT Inhibitors1-(-Benzoylethyl)pyridinium • 2-(α-Naphthoyl)ethyltrimethylammonium • 3-Chloro-4-stillbazole • 4-(1-Naphthylvinyl)pyridine • Acetylseco Hemicholinium-3 • Acryloylcholine • AF64A • B115 • BETA • CM-54,903 • N,N-Dimethylaminoethylacrylate • N,N-DimethylaminoethylchloroacetateCatabolismAChE InhibitorsReversible: Carbamates: Aldicarb • Bendiocarb • Bufencarb • Carbaryl • Carbendazim • Carbetamide • Carbofuran • Chlorbufam • Chloropropham • Ethienocarb • Ethiofencarb • Fenobucarb • Fenoxycarb • Formetanate • Furadan • Ladostigil • Methiocarb • Methomyl • Miotine • Oxamyl • Phenmedipham • Pinmicarb • Pirimicarb • Propamocarb • Propham • Propoxur; Stigmines: Ganstigmine • neostigmine • Phenserine • Physostigmine • pyridostigmine • Rivastigmine; Others: Ambenonium • donepezil • edrophonium • galantamine • Huperzine A (Huperzia Serrata) • tacrine • Zanapezil
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Trade names

Trade names and prices of rivastigmine

Name Information Price* Quantity
       
Exelon 1.5mg 28 capsules (rivastigmine) $79 28 capsules
Exelon 3mg 28 capsules (rivastigmine) $79 28 capsules
Exelon 4.5mg 28 capsules (rivastigmine) $79 28 capsules
Exelon 6mg 28 capsules (rivastigmine) $79 28 capsules
Exelon Patch 4.6mg/24hours 30 patches (rivastigmine) $171 30 patches
Exelon Patch 9.5mg/24hours 30 patches (rivastigmine) $171 30 patches
Exelon solution 2mg/ml 120 ml (rivastigmine) $184 120 ml
Generic Rivastigmine 1.5mg 30 capsule (Rivastigmine) $41 30 capsule
Generic Rivastigmine 3mg 30 capsule $33 30 capsule
Generic Rivastigmine 4.5mg 60 capsule (Rivastigmine) $101 60 capsule
Generic Rivastigmine 6mg 60 capsule $94 60 capsule

*) Prices related to some of online drugstores. There are only approximate prices. For some of drugs is needed a prescription.

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