Rivastigmine: Difference between revisions

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[[Category: Drugs]] [[Category: Acetylcholinesterase inhibiting drug]]
[[Category: Drugs]][[Category: Acetylcholinesterase inhibitor]]
'''Rivastigmine''' (中文: [[利凡斯的明]]) is a reversible acetylcholinesterase inhibitor. Rivastigmine is selective for the CNS and is used for the treatment of mild to moderate dementia associated with Parkinson’s disease.  
 
[[:Category: Antidementia Drug | '''Antidementia Drug''']]
 
'''Drug class: [[:Category: Acetylcholinesterase inhibitor | Acetylcholinesterase Inhibitor]]'''
 
'''Rivastigmine (EXELON)''' (中文: [[利凡斯的明]]) is a reversible acetylcholinesterase inhibitor. Rivastigmine is selective for the CNS and is used for the treatment of mild to moderate dementia associated with Parkinson’s disease.  
==Pronunciation==
==Pronunciation==
===Rivastigmine 1.5mg (EXELON 1.5mg)===
===Rivastigmine 1.5mg (EXELON 1.5mg)===
Line 10: Line 15:
===Rivastigmine 4.5mg (EXELON 4.5mg)===
===Rivastigmine 4.5mg (EXELON 4.5mg)===
[[File:Rivastigmine 4.5mg (EXELON 4.5mg).mp3]]
[[File:Rivastigmine 4.5mg (EXELON 4.5mg).mp3]]
==Common Strengths==
*Oral Capsules: 1.5 mg, 3 mg, 4.5 mg, 6 mg
*Transdermal Patches: 4.6 mg/24 hours, 9.5 mg/24 hours, 13.3/24 hour
==Drug Trade Names==
*Exelon
==Drug Usage==
For managing symptoms of dementia, improving cognitive function and daily living activities in affected individuals. It is not a cure but may help slow the progression of symptoms.


==Mechanism of Action==
==Mechanism of Action==
Acetylcholinesterase inhibiting drug.
Rivastigmine works by inhibiting acetylcholinesterase, the enzyme responsible for breaking down acetylcholine in the brain. This inhibition leads to increased level of acetylcholine, which is crucial for memory and cognitive function.


==Route of Administration==
Rivastigmine can be administered:
*Orally (capsules)
*Transdermally (patch)
==Dosage==
*Initial: 1.5 mg orally twice daily; may increase every two weeks up to a maximum of 6 mg twice daily.
*Transdermal: Start with a patch delivering 4.6 mg/24 hours, with potential increases based on tolerance.
'''Conversion of oral rivastigmine to patches are as follows
*Those taking ≤6 mg daily of oral rivastigmine may be switched to 4.6 mg/24 hours patch.
*Those taking more than 6 mg daily may be switched to 9.5 mg/24 hours patch.
*The first patch should be applied on the day following the last oral dose.
'''How quickly dose Rivastigmine patch work?
Rivastigmine may take as long as 12 weeks to begin working and individual response to this medication will vary.
==Side Effects==
{| class="wikitable"
{| class="wikitable"
!Generic Name
!style="text-align: left"| Frequency
藥名
!Adverse reactions
!HA Code 藥物代碼
|-
!Classification藥物分類
| rowspan="5" | '''Common Side Effects
| Nausea
|-
| Vomiting
|-
|-
|Rivastigmine Cap 1.5 mg
| Loss of appetite
|RIVA01
|P1S1S3
|-
|-
|Rivastigmine Cap 3 mg
| Diarrhea
|RIVA02
|P1S1S3
|-
|-
|Rivastigmine Cap 6 mg
| Dizziness
|RIVA04
|-
|P1S1S3
| rowspan="3" | '''Serious Side Effects
| Sever allergic reactions (e.g. difficulty greathing)
|-
| Seizures
|-
| Involuntary movement or tremors
|}
|}


==Dosage==
==Pharmacokinetics==
The drug can be administered orally or via a transdermal patch; the latter form reduces the prevalence of side effects, which typically include nausea and vomiting.
It is available in two primary formulations: capsules and transdermal patches. The pharmacokinetics of these two forms differ significantly
*The transdermal patch provides a continuous release of rivastigmine over 24 hours, leading to a smoother pharmacokinetic profile with lower peak plasma concentrations compared to oral capsules.
*The patches are designed to minimize fluctuations in drug levels, which can enhance tolerability and compliance among patients.


By Oral: initially 1.5 mg twice daily, increased in steps of 1.5 mg twice daily at intervals of at least 2 weeks according to response and tolerance. Usual range 3-6 mg twice daily. Maximum 6 mg twice daily. If treatment interrupted for more than several days, treatment should be retitrated from 1.5 mg twice daily.
Summary of Key Differences
{| class="wikitable"
!style="text-align: left"| Feature
!Capsules
!Transdermal Patch
|-
| Absorptions Peak Time
| ~1 hour
| Continuous over 24 hours
|-
| Elimination half-life
| ~1 hour
| ~1 hour
|-
| Dosing Flexibility
| Requires titration
| Steady release
|}


Transdermal patches delivering 4.6, 9.5, or 13.3 mg of rivastigmine over 24 hours are also available for once-daily application.  
In conclusion, both formulations of rivastigmine serve important roles in managing dementia symptoms but differ significantly in their pharmacokinetic profiles. The transdermal patch offers advantages in terms of steady drug delivery and reduced side effects compared to oral administration.


Transdermal application: initially apply 4.6 mg/24 hours patch to clean, dry, non-hairy, non-irritated skin on back, upper arm, or chest, removing after 24 hours. It should not be applied to the abdomen or thigh due to decreased bioavailability. Re-application to the same site should be avoided for 14 days. Only one patch should be applied at a time.
==Drug Precautions==
'''Pregnancy


If well tolerated, increase to 9.5 mg/24 hours patch daily.
The safety of rivastigmine during pregnancy has not been established.


After a further 6 months if well tolerated and cognitive deterioration or functional decline are shown, the dose can be increased to 13.3 mg/24 hours patch daily.
'''Breastfeeding


However, for patients with a body weight below 50 kg, a maintenance dose of 4.6 mg/24 hours daily may be sufficient.
Rivastigmine should generally not be used by nursing mothers unless the benefits outweigh potential risks.


Conversion of oral rivastigmine to patches are as follows:
'''Children and Elderly
*Those taking ≤ 6 mg daily of oral rivastigmine may be switched to 4.6 mg/24 hours patch.
*Children: Safety and efficacy in children have not been established
*Those taking more than 6 mg daily may be switched to 9.5 mg/24 hours patch.
*Elderly: Generally well-tolerated; however, lower starting doses may be considered due to increased sensitivity to side effects.


The first patch should be applied on the day following the last oral dose.
'''Hepatic Impairment


Clinical benefit should be assessed on a regular basis.  
Titrate according to individual tolerability in mild to moderate impairment; use with caution in severe impairment.


===How quickly dose Rivastigmine patch work?===
'''Renal Impairment
Rivastigmine may take as long as 12 weeks to begin working and individual response to this medication will vary.


==Side Effects==
Titrate according to individual tolerability.
Significant gastrointestinal side effects include
*Nausea and vomiting
*Loss of appetite
*Weight loss
*Diarrhea


Serious side effects may include:
'''Drug Monitoring Items
*Abnormal heart rhythms
*Difficulty emptying urine from the bladder
*seizures


==Pharmacokinetics==
Monitoring should include:
*Cognitive function assessments (e.g. MoCA)
*Monitoring for gastrointestinal side effects (nausea, vomiting)
*Regular evaluation of heart rate and blood pressure due to potential bradycardia
*Regular monitoring of weight is important, as patients may experience weight loss while on rivastigmine


{| class = "wikitable"
'''Drug Interactions
!style="text-align: left"| Oral bioavailability
|Donepezil hydrochloride is rapidly and well absorbed from the gastrointestinal tract. Plasma protein binding is about 40%.
|-
!style="text-align: left"| Onset of action
|Peak plasma levels in about one hour after ingestion. Absorption from transdermal patches is slow and peak plasma concentrations are reached in 10 to 16 hours after applying the first patch; with subsequent patches, peak concentrations are reached in about 8 hours.
|-
!style="text-align: left"| Metabolism
|Primarily metabolized through hydrolysis. Minimal metabolism occurs via the cytochrome P450. 
|-
!style="text-align: left"| Elimination half-life
|1.5 hours after oral doses and about 3 hours after patch removal.
|}


==Drug Management==
Rivastigmine has low potential for drug-drug interactions but should be used cautiously with:
===Monitoring===
*Beta-blockers: can affect heart rate and rhythm
*acetylcholinesterase inhibitor may increase gastric acid secretion, so patients should be monitored closely for GI bleeding, especially those receiving concurrent NSAID drugs.
*Other cholinergic agents
*check body weight regularly
*Medications affecting gastrointestinal motility (e.g. metoclopramide may increase extrapyramidal side effects.)
*monitor the cognitive, global functions, and ADL activities
*monitor the sleeping quality


===Caution===
'''Caution
*Cardiovascular conduction disorders such as sick-sinus syndrome
*Cardiovascular conduction disorders such as sick-sinus syndrome
*Susceptibility to peptic ulcers
*Susceptibility to peptic ulcers
Line 101: Line 140:
*Concomitant antipsychotic treatment – increased risk of neuroleptic malignant syndrome
*Concomitant antipsychotic treatment – increased risk of neuroleptic malignant syndrome


===Contraindications===
'''Contraindications
 
Patients with known hypersensitivity to rivastigmine.
Patients with known hypersensitivity to rivastigmine.
===Hepatic impairment===
Titrate according to individual tolerability in mild to moderate impairment; use with caution in severe impairment.
===Renal impairment===
Titrate according to individual tolerability
===Effects on ability to drive and use machinery===
Rivastigmine can cause fatigue, dizziness and muscles, mainly when initiating or increasing the dose. The treating doctor should routinely evaluate the ability of patients on donepezil to continue driving or operating complex machines.


==FAQ==
==FAQ==
=== How should I take Rivastigmine?===
'''How Should I Take the Tablet?
If you are taking the capsules, swallow them whole with a full glass of water, with your morning and evening meals. Do not open or crush the capsules.


If you are using the patch, apply it to a clean, dry and hairless skin area on your upper or lower back, upper arm, or chest. Do not put the patch over rashes, cuts, or irritated skin. Do not apply to the same area for 14 days.  
Take rivastigmine capsules twice daily with meals to reduce gastrointestinal side effects.


=== How often do I change Rivastigmine Patch?===
'''What Should I Avoid While Taking?
Change the patch every 24 hours around the same time.


===What should I avoid while taking?===
Avoid alcohol and medications that can cause sedation or affect alertness until you know how rivastigmine affects you.
Avoid abruptly discontinue the medication.  


=== What happen if I overdose?===
'''What Happens if I Miss a Dose?
Contact your primary care doctor.
If emergency situation, call 999


=== What happen if I miss a dose?===
Take the missed dose as soon as you remember unless it is almost time for your next dose. Do not double up on doses.
Take it as soon as you  
remember. If it is near the time  
of the next dose, skip the missed
dose. Take your next dose at the
regular time. Do not double the
dose to catch up.

Latest revision as of 23:39, 6 November 2024


Antidementia Drug

Drug class: Acetylcholinesterase Inhibitor

Rivastigmine (EXELON) (中文: 利凡斯的明) is a reversible acetylcholinesterase inhibitor. Rivastigmine is selective for the CNS and is used for the treatment of mild to moderate dementia associated with Parkinson’s disease.

Pronunciation[edit]

Rivastigmine 1.5mg (EXELON 1.5mg)[edit]

Rivastigmine 3mg (EXELON 3mg)[edit]

Rivastigmine 4.5mg (EXELON 4.5mg)[edit]

Common Strengths[edit]

  • Oral Capsules: 1.5 mg, 3 mg, 4.5 mg, 6 mg
  • Transdermal Patches: 4.6 mg/24 hours, 9.5 mg/24 hours, 13.3/24 hour

Drug Trade Names[edit]

  • Exelon

Drug Usage[edit]

For managing symptoms of dementia, improving cognitive function and daily living activities in affected individuals. It is not a cure but may help slow the progression of symptoms.

Mechanism of Action[edit]

Rivastigmine works by inhibiting acetylcholinesterase, the enzyme responsible for breaking down acetylcholine in the brain. This inhibition leads to increased level of acetylcholine, which is crucial for memory and cognitive function.

Route of Administration[edit]

Rivastigmine can be administered:

  • Orally (capsules)
  • Transdermally (patch)

Dosage[edit]

  • Initial: 1.5 mg orally twice daily; may increase every two weeks up to a maximum of 6 mg twice daily.
  • Transdermal: Start with a patch delivering 4.6 mg/24 hours, with potential increases based on tolerance.

Conversion of oral rivastigmine to patches are as follows

  • Those taking ≤6 mg daily of oral rivastigmine may be switched to 4.6 mg/24 hours patch.
  • Those taking more than 6 mg daily may be switched to 9.5 mg/24 hours patch.
  • The first patch should be applied on the day following the last oral dose.

How quickly dose Rivastigmine patch work?

Rivastigmine may take as long as 12 weeks to begin working and individual response to this medication will vary.

Side Effects[edit]

Frequency Adverse reactions
Common Side Effects Nausea
Vomiting
Loss of appetite
Diarrhea
Dizziness
Serious Side Effects Sever allergic reactions (e.g. difficulty greathing)
Seizures
Involuntary movement or tremors

Pharmacokinetics[edit]

It is available in two primary formulations: capsules and transdermal patches. The pharmacokinetics of these two forms differ significantly

  • The transdermal patch provides a continuous release of rivastigmine over 24 hours, leading to a smoother pharmacokinetic profile with lower peak plasma concentrations compared to oral capsules.
  • The patches are designed to minimize fluctuations in drug levels, which can enhance tolerability and compliance among patients.

Summary of Key Differences

Feature Capsules Transdermal Patch
Absorptions Peak Time ~1 hour Continuous over 24 hours
Elimination half-life ~1 hour ~1 hour
Dosing Flexibility Requires titration Steady release

In conclusion, both formulations of rivastigmine serve important roles in managing dementia symptoms but differ significantly in their pharmacokinetic profiles. The transdermal patch offers advantages in terms of steady drug delivery and reduced side effects compared to oral administration.

Drug Precautions[edit]

Pregnancy

The safety of rivastigmine during pregnancy has not been established.

Breastfeeding

Rivastigmine should generally not be used by nursing mothers unless the benefits outweigh potential risks.

Children and Elderly

  • Children: Safety and efficacy in children have not been established
  • Elderly: Generally well-tolerated; however, lower starting doses may be considered due to increased sensitivity to side effects.

Hepatic Impairment

Titrate according to individual tolerability in mild to moderate impairment; use with caution in severe impairment.

Renal Impairment

Titrate according to individual tolerability.

Drug Monitoring Items

Monitoring should include:

  • Cognitive function assessments (e.g. MoCA)
  • Monitoring for gastrointestinal side effects (nausea, vomiting)
  • Regular evaluation of heart rate and blood pressure due to potential bradycardia
  • Regular monitoring of weight is important, as patients may experience weight loss while on rivastigmine

Drug Interactions

Rivastigmine has low potential for drug-drug interactions but should be used cautiously with:

  • Beta-blockers: can affect heart rate and rhythm
  • Other cholinergic agents
  • Medications affecting gastrointestinal motility (e.g. metoclopramide may increase extrapyramidal side effects.)

Caution

  • Cardiovascular conduction disorders such as sick-sinus syndrome
  • Susceptibility to peptic ulcers
  • Asthma, chronic obstructive pulmonary disease
  • People who have a predisposition to seizures
  • Concomitant antipsychotic treatment – increased risk of neuroleptic malignant syndrome

Contraindications

Patients with known hypersensitivity to rivastigmine.

FAQ[edit]

How Should I Take the Tablet?

Take rivastigmine capsules twice daily with meals to reduce gastrointestinal side effects.

What Should I Avoid While Taking?

Avoid alcohol and medications that can cause sedation or affect alertness until you know how rivastigmine affects you.

What Happens if I Miss a Dose?

Take the missed dose as soon as you remember unless it is almost time for your next dose. Do not double up on doses.

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