Question 1

What is Gabapentin enacarbil?

Accepted Answer

Gabapentin enacarbil is a medication classified as a gabapentinoid. It is a prodrug, which means it is a compound that the body converts into the active medication gabapentin after it is absorbed into the system.

This medication is designed to provide a more consistent and predictable delivery of gabapentin into the bloodstream. It works by interacting with specific pathways in the nervous system to influence how nerves transmit signals.

Question 2

What is Gabapentin enacarbil used for?

Accepted Answer

Gabapentin enacarbil is used to treat postherpetic neuralgia and restless legs syndrome .

Question 3

How does Gabapentin enacarbil work?

Accepted Answer

Conversion into Gabapentin

Gabapentin enacarbil is known as a prodrug. This means that when you take the medication, it is not yet active. Once it enters the body, enzymes in the digestive tract convert it into gabapentin, which is the active medicine that treats symptoms. This specific formulation is designed to be absorbed more efficiently by the body than standard gabapentin.

How It Affects the Nervous System

The exact way gabapentin works to treat restless legs syndrome or nerve pain after shingles is not completely understood. However, researchers believe it interacts with the central nervous system in the following ways:

Calcium Channel Binding: The medication binds to specific sites on voltage-gated calcium channels in the brain and spinal cord. This action is thought to help regulate the release of neurotransmitters, which are chemicals that nerves use to communicate.

Reducing Nerve Signals: By affecting these channels, the drug may decrease the transmission of pain signals and calm overactive nerves.

Although gabapentin is structurally similar to a natural brain chemical called gamma-aminobutyric acid (GABA), it does not bind to GABA receptors or change the way GABA is used in the brain. Instead, it focuses on stabilizing electrical activity in the nerves to provide relief.

Question 4

What are the brand names for Gabapentin enacarbil?

Accepted Answer

Gabapentin enacarbil is sold under the brand name Horizant .

Question 5

What are the active ingredients in Gabapentin enacarbil?

Accepted Answer

The active ingredient in Gabapentin enacarbil is gabapentin .

Question 6

What are the side effects of Gabapentin enacarbil?

Accepted Answer

Common side effects of Gabapentin enacarbil may include:

dizziness

drowsiness

headache

and others

Always consult with a healthcare professional about potential side effects.

Question 7

What drug class is Gabapentin enacarbil?

Accepted Answer

Gabapentin enacarbil belongs to the gabapentinoid drug class.

Question 8

What is the dosage of Gabapentin enacarbil and how do I take it?

Accepted Answer

How to Take

This medication is an extended-release tablet taken by mouth. It should always be taken with food. Swallow the tablets whole; do not crush, chew, or break them, as doing so can release the entire dose into your system at once and increase the risk of side effects.

General Dosing Patterns

The timing and frequency of your doses depend on the condition being treated:

Restless Legs Syndrome: The medication is typically taken once daily in the evening.

Postherpetic Neuralgia: The medication is usually taken twice daily.

Missed Dose

If you miss a dose, skip the missed dose and take your next dose at the regularly scheduled time. Do not take two doses at once to make up for a missed one.

Storage and Handling

Keep the tablets in their original container. Do not transfer them to a different bottle, such as a pill organizer, as the original packaging helps protect the medication from moisture.

Question 9

Is Gabapentin enacarbil safe during pregnancy and breastfeeding?

Accepted Answer

Pregnancy

There is limited research on the use of gabapentin enacarbil in pregnant women. In animal studies, high doses of the medication were associated with developmental issues, such as skeletal abnormalities and lower birth weights. Because human data is insufficient, healthcare providers typically only prescribe this medication during pregnancy if the potential benefit to the parent justifies the potential risk to the developing fetus.

If you become pregnant while taking this medication, you are encouraged to talk to your doctor about enrolling in the North American Antiepileptic Drug (NAAED) Pregnancy Registry. This registry collects information to help researchers understand how certain medications affect pregnancy outcomes.

Breastfeeding

Gabapentin, the active form of gabapentin enacarbil, is known to pass into human breast milk. There is currently no clear information on how the drug affects breastfed infants or milk production. If you are breastfeeding or planning to breastfeed, discuss the potential risks and benefits with your healthcare provider to determine the best course of action for you and your baby.

Question 10

What forms and strengths does Gabapentin enacarbil come in?

Accepted Answer

Available Forms

Gabapentin enacarbil is provided as an oral medication in the following form:

Extended-release tablet: This formulation is designed to release the medication slowly into the body after it is swallowed.

These tablets are intended to be swallowed whole. They should not be crushed, chewed, or broken, as doing so can interfere with the extended-release mechanism of the medication.

Question 11

What is the FDA approval status of Gabapentin enacarbil?

Accepted Answer

FDA Approval and Indications

Gabapentin enacarbil is approved by the U.S. Food and Drug Administration (FDA) for the treatment of two specific conditions in adults:

Moderate-to-severe primary Restless Legs Syndrome (RLS).

Postherpetic neuralgia (PHN), which is the chronic nerve pain that can follow a shingles infection.

Safety Communications

The FDA has issued safety alerts regarding the risk of serious breathing difficulties associated with gabapentinoids, the class of drugs that includes gabapentin enacarbil. These respiratory issues are most likely to occur in patients with pre-existing respiratory risk factors, such as chronic obstructive pulmonary disease (COPD) or reduced lung function. The risk is also significantly increased when the medication is used in combination with other central nervous system (CNS) depressants, particularly opioid pain medications.

Healthcare providers are encouraged to monitor patients for signs of respiratory depression and to use the lowest effective dose, especially in elderly patients or those with underlying lung disease.

Regulatory Classification

At the federal level in the United States, gabapentin enacarbil is not classified as a controlled substance. However, because it is a prodrug that is converted into gabapentin within the body, it may be subject to specific monitoring requirements in certain states. Some state jurisdictions have implemented additional oversight or reclassified gabapentin-containing products due to concerns regarding misuse and safety.

Question 12

What should I know about Gabapentin enacarbil and withdrawal?

Accepted Answer

Risks of Abrupt Discontinuation

You should not stop taking gabapentin enacarbil without first consulting your healthcare provider. Stopping the medication abruptly can lead to withdrawal symptoms or cause the symptoms of your condition to return. If you are taking this medication for Restless Legs Syndrome (RLS), stopping it suddenly may cause your RLS symptoms to become more severe than they were before treatment.

Potential Withdrawal Symptoms

While specific withdrawal data for the enacarbil formulation is limited, medications in the gabapentinoid class are generally associated with certain symptoms when stopped quickly. These may include:

Anxiety

Insomnia or difficulty sleeping

Nausea

Pain

Sweating

Seizure Risk

For patients using gabapentin products for seizure disorders, stopping the medication suddenly can increase the frequency of seizures. In some cases, this can lead to status epilepticus, a serious condition where seizures do not stop. Even if you are taking gabapentin enacarbil for a different condition, such as nerve pain, a gradual taper is usually recommended to ensure safety.

Tapering the Dose

To minimize the risk of withdrawal, healthcare providers typically recommend gradually reducing the dose over a period of at least one week. Your doctor will provide a specific schedule to slowly lower your dosage before you stop the medication entirely. Always follow these instructions carefully and report any new or worsening symptoms during the tapering process.

Gabapentin enacarbil

Medication Quick Facts

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What It's Used For

How It Works

Brand Names

Side Effects

Warnings & Precautions

Dosage & How to Take

Pregnancy & Breastfeeding

Forms & Strengths

FDA / Regulatory Status

Withdrawal Information

FAQ

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