What are the Precautions When Taking Gabapentin (Neurontin®)?

Gabapentin (brand name: Neurontin) is a generic prescription drug that is FDA-approved as an add-on treatment with other medications for partial seizures in those with epilepsy. It can also be used to treat nerve pain from postherpetic neuralgia (a complication of shingles). Gabapentin is frequently prescribed off-label for many other conditions, such as diabetic peripheral neuropathy, fibromyalgia, and alcohol dependence.

Gabapentin is an anticonvulsive medication that originally saw use as a muscle relaxer and anti-spasmodic medication, but later it was discovered it had the potential of the medication as anticonvulsive medication and as an adjunct to more potent anticonvulsants. It is also useful in certain types of neural pain control. This activity outlines the indications, mechanism of action, dosing, significant adverse effects, contraindications, monitoring, and toxicity of gabapentin and increases practitioners’ knowledge about how to approach this medication and all health professionals in how to monitor it to drive better patient outcomes.

Gabapentin is typically prescribed as a generic, but the drug is also available under the brand names Neurontin and Gralise. Some patients may be prescribed drugs very similar to gabapentin—such as Horizant (gabapentin enacarbil) or Lyrica (pregabalin)—instead of gabapentin.

Gabapentin is taken as a tablet, capsule, or oral liquid. Dosing will depend on the condition being treated, age of the person being treated, and kidney function. The usual dose for epilepsy starts at 300 mg on the first day. The dose can then be increased until an effective dose is reached, which is usually 300 to 600mg taken three times per day.

Forms and Strengths

Generic: Gabapentin

- Form: oral capsule
- Strengths: 100 mg, 300 mg, 400 mg

Brand: Neurontin

- Form: oral capsule
- Strengths: 100 mg, 300 mg, 400 mg

Dosage for postherpetic neuralgia

Adult dosage (ages 18–64 years)

Typical starting dosage: Day 1, 300 mg; day 2, 600 mg (300 mg two times per day, spaced evenly throughout the day); day 3, 900 mg (300 mg, three times per day, spaced evenly throughout the day). Your doctor may further increase your dosage after day 3.
Maximum dosage: 1,800 mg per day (600 mg, three times per day, spaced evenly throughout the day)

Child dosage (ages 0–17 years)

Dosage for people younger than 18 years has not been established.

Senior dosage (ages 65 years and older)

Your kidney function may decrease with age. Your body may get rid of this drug more slowly. Your doctor may start you on a lower dose so that too much of this drug does not build up in your body. Too much of the drug in your body can be dangerous. Your doctor may change your dose based on how well your kidneys are working.

This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using Gabapentin (buy neurontin® online), tell your doctor or pharmacist your medical history, especially of: kidney disease, mental/mood problems (such as depression, thoughts of suicide), use/abuse of drugs/alcohol.

This drug may make you dizzy or drowsy or cause blurred vision. Do not drive, use machinery, or do any activity that requires alertness or clear vision until you are sure you can perform such activities safely. Limit alcoholic beverages.

Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).

Older adults may be more sensitive to the side effects of this drug, especially swelling of the hands/ankles/feet, dizziness, or loss of coordination. Dizziness and loss of coordination can increase the risk of falling.

Children may be more sensitive to the side effects of this drug, especially mental/mood/behavior changes (such as hostility, problems concentrating, restlessness).

During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.

Gabapentin passes into breast milk. Consult your doctor before breast-feeding.

Gabapentin OVERDOSE

A lethal dose of gabapentin was not identified in mice and rats receiving single oral doses as high as 8000 mg/kg. Signs of acute toxicity in animals included ataxia, labored breathing, ptosis, sedation, hypoactivity, or excitation.

Acute oral overdoses of NEURONTIN up to 49 grams have been reported. In these cases, double vision, slurred speech, drowsiness, lethargy, and diarrhea were observed. All patients recovered with supportive care. Coma, resolving with dialysis, has been reported in patients with chronic renal failure who were treated with NEURONTIN.

Gabapentin can be removed by hemodialysis. Although hemodialysis has not been performed in the few overdose cases reported, it may be indicated by the patient’s clinical state or in patients with significant renal impairment.

If overexposure occurs, call your poison control center at 1-800-222-1222.

Gabapentin may interact with other medications

Gabapentin oral capsule can interact with several other medications. Different interactions can cause different effects. For instance, some can interfere with how well a drug works, while others can cause increased side effects.

Below is a list of medications that can interact with gabapentin. This list does not contain all drugs that may interact with gabapentin.

Before taking gabapentin, be sure to tell your doctor and pharmacist about all prescription, over-the-counter, and other drugs you take. Also tell them about any vitamins, herbs, and supplements you use. Sharing this information can help you avoid potential interactions.

If you have questions about drug interactions that may affect you, ask your doctor or pharmacist.

Pain drugs

When used with gabapentin, certain pain drugs can increase its side effects, such as tiredness. Examples of these drugs include:

morphine

Stomach acid drugs

When used with gabapentin, certain drugs used to treat stomach acid problems can reduce the amount of gabapentin in your body. This can make it less effective. Taking gabapentin 2 hours after taking these drugs can help prevent this problem. Examples of these drugs include:

aluminum hydroxide
magnesium hydroxide

Important considerations for taking gabapentin

Keep these considerations in mind if your doctor prescribes gabapentin oral capsule for you.

General

Gabapentin oral capsules can be taken with or without food. Taking them with food can help to reduce upset stomach.

Storage

Store gabapentin at room temperature between 68°F and 77°F (20°C and 25°C).
Don’t store this medication in moist or damp areas, such as bathrooms.

Refills

A prescription for this medication is refillable. You should not need a new prescription for this medication to be refilled. Your doctor will write the number of refills authorized on your prescription.

Travel

When traveling with your medication:

Always carry your medication with you, such as in your carry-on bag.
Don’t worry about airport X-ray machines. They can’t hurt your medication.
You may need to show airport staff the pharmacy label for your medication. Be sure to carry with you the prescription-labeled box that your medication came in.
Do not put this medication in your car’s glove compartment or leave it in the car. Be sure to avoid doing this when the weather is very hot or very cold.

Clinical monitoring

Your doctor will monitor your kidney function.

Insurance

Many insurance companies require a prior authorization for gabapentin. This means your doctor will need to get approval from your insurance company before your insurance company will pay for the prescription.

Are there any alternatives?

There are other drugs available to treat your condition. Some may be better suited for you than others. Talk to your doctor about other drug options that may work for you.

Disclaimer: Healthline has made every effort to make certain that all information is factually correct, comprehensive, and up-to-date. However, this article should not be used as a substitute for the knowledge and expertise of a licensed healthcare professional. You should always consult your doctor or other healthcare professional before taking any medication. The drug information contained herein is subject to change and is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. The absence of warnings or other information for a given drug does not indicate that the drug or drug combination is safe, effective, or appropriate for all patients or all specific uses.

Gabapentin for Fibromyalgia

What Is Gabapentin?

Gabapentin is somewhat commonly prescribed as a fibromyalgia treatment, however, it is not approved by the U.S. Food and Drug Administration (FDA) for this condition.

It’s often prescribed off-label. However, the drug is chemically related to Lyrica (pregabalin), which is approved for fibromyalgia. In fact, Lyrica is sometimes referred to as the “son of Neurontin.”

Gabapentin is classified as an anti-seizure drug. It’s used to treat epilepsy, neuropathy (pain from damaged nerves), restless legs syndrome, and hot flashes. Fibromyalgia pain is similar to neuropathy, but whether this condition involves nerve damage still isn’t clear.

How Gabapentin Works

Gabapentin is believed to work by altering the release of glutamate and other neurotransmitters in your brain.1 Neurotransmitters send messages from one brain cell to another. Glutamate is helpful for certain things, like learning new information. That’s because it gets your brain cells stirred up and active.

Though, if you have too much glutamate, your brain cells can become overstimulated. That can make all kinds of things go wrong.

Glutamate also helps transmit pain signals in your brain and nerves. Too much glutamate may play a role in hyperalgesia, which essentially turns up the volume of pain.

To counter the effects of glutamate, you have another neurotransmitter called gamma-aminobutyric acid (GABA).2 It calms your cells and quiets your brain. When GABA and glutamate exist in balance with each other, things go well. (It’s likely out of balance in fibromyalgia, though.)

Some diseases and conditions—including fibromyalgia—may interrupt this balance and let glutamate run amok. Gabapentin is believed to reduce your brain’s release of glutamate so the cells can calm down and your brain can function better.

Gabapentin for Fibromyalgia

Research suggests that people with fibromyalgia have too much glutamate in certain parts of their brain, so gabapentin has long been prescribed for it. But is it effective? Research is mixed.

Two reviews of the evidence disagree. One released in 2016 found that gabapentin is an effective fibromyalgia treatment,3 while another, published in 2017,4 reported only low-quality evidence.

A 2014 review of gabapentin for fibromyalgia and neuropathy found that about 35% of study participants saw their pain drop by at least 50% while on the drug.5 It’s important to note, though, that 21% saw similar drops when taking a placebo.

In studies comparing gabapentin with Lyrica (pregabalin) , including one published in The Journal of the American Medical Association, pregabalin appeared to perform better.

An extended-release form of gabapentin showed promise in one small trial published in Pain Practice.3 Researchers say it improved pain, sleep, and quality of life. This was a preliminary trial, though, so more work needs to be done before we’ll know for sure whether it’s safe and effective long term.

New research supported by the National Institutes of Health’s National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) shows that the anticonvulsant medication gabapentin, which is used for certain types of seizures, can be an effective treatment for the pain and other symptoms associated with the common, often hard-to-treat chronic pain disorder, fibromyalgia.

In the NIAMS-sponsored, randomized, double-blind clinical trial of 150 women (90 percent) and men with the condition, Lesley M. Arnold, M.D., director of the Women’s Health Research Program at the University of Cincinnati College of Medicine, and her colleagues found that those taking gabapentin at dosages of 1,200 to 2,400 mg daily for 12 weeks displayed significantly less pain than those taking placebo. Patients taking gabapentin also reported significantly better sleep and less fatigue. For the majority of participants, the drug was well tolerated. The most common side effects included dizziness and sedation, which were mild to moderate in severity in most cases.

NIAMS Director Stephen I. Katz. M.D., Ph.D., remarked that “While gabapentin does not have Food and Drug Administration approval for fibromyalgia¹, I believe this study offers additional insight to physicians considering the drug for their fibromyalgia patients. Fibromyalgia is a debilitating condition for which current treatments are only modestly effective, so a study such as this is potentially good news for people with this common, painful condition.”

Fibromyalgia is a chronic disorder characterized by chronic, widespread muscle pain and tenderness, and is frequently accompanied by fatigue, insomnia, depression, and anxiety. It affects three million to six million Americans, mostly women, and can be disabling.

The precise cause of fibromyalgia in not known, but research suggests it is related to a problem with the central nervous system’s processing of pain. As with some other chronic pain conditions, people with fibromyalgia often develop a heightened response to stimuli, experiencing pain that would not cause problems in other people. Yet, unlike many other pain syndromes, there is no physical evidence of inflammation or central nervous system damage.

Although Gabapentin has little, if any, effect on acute pain, it has shown a robust effect on pain caused by a heightened response to stimuli related to inflammation or nerve injury in animal models of chronic pain syndromes. Researchers have suspected that it might have the same effect in people with Fibromyalgia. The new research, published in the April 2007 edition of Arthritis & Rheumatism, indicates the suspicions were correct.

Although the researchers cannot say with certainty how Gabapentin helps reduce pain, Dr. Arnold says one possible explanation involves the binding of gabapentin to a specific subunit of voltage-gated calcium channels on neurons. “This binding reduces calcium flow into the nerve cell, which reduces the release of some signaling molecules involved in pain processing,” she says.

How gabapentin improves sleep and other symptoms is less clear, and there are probably different mechanisms involved in fibromyalgia symptoms. “Gabapentin improved sleep, which is an added benefit to patients with fibromyalgia who often report unrefreshing or disrupted sleep,” Dr. Arnold says.

What is important is that people with fibromyalgia now have a potential new treatment option for a condition with few effective treatments. “Studies like this give clinicians evidence-based information to guide their treatment of patients,” says Dr. Arnold.

The mission of the National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), a part of the Department of Health and Human Services’ National Institutes of Health, is to support research into the causes, treatment and prevention of arthritis and musculoskeletal and skin diseases; the training of basic and clinical scientists to carry out this research; and the dissemination of information on research progress in these diseases. For more information about NIAMS, call the information clearinghouse at (301) 495-4484 or (877) 22-NIAMS (free call) or visit the NIAMS website at http://www.niams.nih.gov.

Gabapentin Side Effects

Like all drugs, gabapentin comes with a risk of side effects.5 Some are potentially dangerous, while others are not. If you have any of the following side effects while taking gabapentin, call your healthcare provider immediately:

- - Severe weakness or tiredness
  - Upper stomach pain
  - Chest pain
  - New or worsening cough along with fever
  - Difficulty breathing
  - Severe tingling or numbness
  - Rapid, back-and-forth eye movements
  - Pain or difficulty with urination, or no urination
  - Fever
  - Sore throat
  - Swelling in the face or tongue
  - Burning eyes
  - Rash

Side effects that aren’t cause for immediate concern include:

- Fatigue
- Dizziness
- Headache
- Falling asleep
- Weight gain

Children taking gabapentin may experience a different set of side effects. Contact your healthcare provider immediately for the following:

- Changes in behavior
- Memory problems
- Inability to concentrate
- Restlessness, hostility, or aggression

Gabapentin may interact negatively with other drugs. Be sure your healthcare provider and pharmacist know everything you’re taking.

Is Gabapentin Right for You?

With evidence being weak and mixed, gabapentin has one clear advantage over Lyrica—it’s generic, and therefore much less expensive. Price, however, is far less important than efficacy.

We all react differently to medications. Some people who fail on other drugs, including Lyrica, may find relief from gabapentin. Talk to your healthcare provider about the benefits and drawbacks gabapentin may have for your overall treatment regimen.

Which is better for fibromyalgia gabapentin or amitriptyline?

It depends on your symptoms. Research shows that amitriptyline and pregabalin (a drug similar to gabapentin) are equally effective at relieving pain, fatigue, insomnia, and brain fog. Amitriptyline is better at relieving muscular pain while pregabalin is better at easing neuropathic pain.6 Gabapentin also treats neuropathy.

Gabapentin Dosage for Adults

Gabapentin is a prescription drug. It comes as an oral capsule, an immediate-release oral tablet, an extended-release oral tablet, and an oral solution.

Gabapentin oral capsule is available as the brand-name drug Neurontin. It’s also available as a generic drug. Generic drugs usually cost less than the brand-name version. In some cases, the brand-name drug and the generic version may be available in different forms and strengths.

Why Gabapentin is Used

Gabapentin oral capsule is used to treat the following conditions:

- Seizures: Gabapentin is used to treat partial (focal) seizures. It’s taken together with other seizure medications in adults and in children 3 years of age and older who have epilepsy.
- Postherpetic neuralgia: This is pain from nerve damage caused by shingles, a painful rash that affects adults. Shingles appears after infection with the varicella zoster virus. This virus occurs in people who have had chicken pox.

Gabapentin may be used as part of a combination therapy. This means you may need to take it with other drugs.

Gabapentin Dosage for Adults

For adults, the gabapentin dosage can vary widely depending on the condition being treated. Upon starting treatment with gabapentin, the starting dose may be 100 to 300 mg per day and steadily increase until an effective dose is reached. The maximum dosage will depend on the condition being treated.

- Standard gabapentin dosage for adults: 300-600 mg taken three times per day.
- Maximum gabapentin dosage for adults: 1200 mg taken three times per day for a maximum daily dose of 3600 mg.

Gabapentin Dosage Chart for Adult

Indication	Age	Standard dosage	Maximum dosage
Partial seizures
	12 years and older	300-600 mg three times per day	3600 mg per day
	5-11 years	25-35 mg/kg (11.4-15.9 mg/lb) per day divided into three daily doses	50 mg/kg (22.7 mg/lb) per day
	3-4 years	40 mg/kg (18.2 mg/lb) per day divided into three daily doses	50 mg/kg (22.7 mg/lb) per day
Postherpetic neuralgia	18 years and older	300 mg on day 1, 300 mg twice daily on day 2, then 300 mg three times daily on day 3; dosage may be further increased after day 3 to 600 mg three times per day	1800 mg per day
Diabetic peripheral neuropathy	18 years and older	300-1200 mg three times per day (off-label)	3600 mg per day
Fibromyalgia	18 years and older	600 mg twice daily and 1200 mg at bedtime (off-label)	2400 mg per day
Alcohol dependence	18 years and older	300-600 mg three times per day (off-label)	1800 mg per day

Gabapentin Dosage Chart, Gabapentin Dosage for Adults and Gabapentin Dosage for Children

Gabapentin is a generic prescription drug that is FDA-approved as an add-on treatment with other medications for partial seizures in those with epilepsy.

It can also be used to treat nerve pain from postherpetic neuralgia (a complication of shingles). Gabapentin is frequently prescribed off-label for many other conditions, such as diabetic peripheral neuropathy, fibromyalgia, and alcohol dependence.

Gabapentin dosage forms and strengths

Gabapentin is taken by mouth as a tablet, capsule, or oral solution.

- Tablets: 600 or 800 mg per tablet
- Capsules: 100, 300, or 400 mg per capsule
- Liquid: 250 mg per 5 milliliters (ml) oral liquid

Gabapentin dosage for adults

Standard gabapentin dosage for adults: 300-600 mg taken three times per day.
Maximum gabapentin dosage for adults: 1200 mg taken three times per day for a maximum daily dose of 3600 mg.

Gabapentin dosage for children

Gabapentin is FDA approved as a secondary treatment for partial seizures in children 3 years or older with epilepsy. The use of gabapentin in children for any other medical condition is not FDA-approved. Dosing will be determined by both the child’s age and weight.

by both the child’s age and weight.

Gabapentin dosage by age for children older than 3 years
Age (yr)	Recommended dosage
3-4 yrs	40 mg per kg (18.2 mg/lb) of body weight divided into three dosesMaximum: 50 mg per kg (22.7 mg/lb) of body weight daily
5-11 yrs	20-35 mg per kg (9.1-15.9 mg/lb) of body weight divided into three dosesMaximum: 50 mg per kg (22.7 mg/lb) of body weight daily
12 yrs or older	300-600 mg taken three times per dayMaximum: 3600 mg per day

Gabapentin dosage chart
Indication	Age	Standard dosage	Maximum dosage
Partial seizures
	12 years and older	300-600 mg three times per day	3600 mg per day
	5-11 years	25-35 mg/kg (11.4-15.9 mg/lb) per day divided into three daily doses	50 mg/kg (22.7 mg/lb) per day
	3-4 years	40 mg/kg (18.2 mg/lb) per day divided into three daily doses	50 mg/kg (22.7 mg/lb) per day
Postherpetic neuralgia	18 years and older	300 mg on day 1, 300 mg twice daily on day 2, then 300 mg three times daily on day 3; dosage may be further increased after day 3 to 600 mg three times per day	1800 mg per day
Diabetic peripheral neuropathy	18 years and older	300-1200 mg three times per day (off-label)	3600 mg per day
Fibromyalgia	18 years and older	600 mg twice daily and 1200 mg at bedtime (off-label)	2400 mg per day
Alcohol dependence	18 years and older	300-600 mg three times per day (off-label)	1800 mg per day

Gabapentin dosage for partial seizures

Gabapentin is FDA approved as adjunctive therapy for partial seizures in adults and children 3 years of age or older.

Standard gabapentin dosage for adults: 300 to 600 mg taken three times per day by mouth.
Maximum gabapentin dosage for adults: 3600 mg daily in three divided doses.
Renally impaired patients (kidney disease)—dose amount and dose frequency adjustment:
1. Creatinine clearance of 30-59 ml/min: 200 to 700 mg twice per day
2. Creatinine clearance of 16-29 ml/min: 200 to 700 mg once per day
3. Creatinine clearance of 15 ml/min or less: 100 to 300 mg once per day decreased proportionately (1/15 per whole number value) for each decrease in creatinine clearance
4. Hemodialysis: dose is dependent on estimated creatinine clearance; a supplemental dose of 125 to 350 mg is given after dialysis

Gabapentin dosage for nerve pain due to shingles (postherpetic neuralgia)

Gabapentin is FDA approved to treat postherpetic neuralgia, that is, neuropathic pain due to shingles (herpes zoster).

Standard gabapentin dosage for adults: 300 to 600 mg taken three times per day by mouth.

Maximum gabapentin dosage for adults: 1800 mg daily in three divided doses.

Renally impaired patients (kidney disease): See dosage for renal impaired patients above

Gabapentin dosage for neuropathic pain

Gabapentin is most frequently prescribed off-label to treat nerve pain (neuralgia) due to nerve damage (neuropathy), compression, or irritation.

Standard gabapentin dosage for adults: 300 to 1200 mg taken three times per day by mouth.

Maximum gabapentin dosage for adults: 3600 mg daily in three divided doses.

Renally impaired patients (kidney disease): See dosage for renal impaired patients above

Gabapentin dosage for fibromyalgia

Gabapentin is used off-label to reduce fatigue, provide pain relief, and improve sleep in patients with fibromyalgia.

Standard gabapentin dosage for adults: 600 mg twice daily and 1200 mg at bedtime.

Maximum gabapentin dosage for adults: 2400 mg daily.

Renally impaired patients (kidney disease): See dosage for renal impaired patients above

Gabapentin dosage for alcohol dependence

Gabapentin is widely used off-label to reduce insomnia and cravings in people with alcohol use disorder, particularly those in the maintenance phase of alcohol abstinence.

Standard gabapentin dosage for adults: 300 to 600 mg taken three times per day by mouth.

Maximum gabapentin dosage for adults: 1800 mg daily in three divided doses.

Renally impaired patients (kidney disease): See dosage for renal impaired patients above

Gabapentin dosage for pets

You should not give gabapentin to animals unless a veterinarian has given the animal a prescription for gabapentin. Veterinarians frequently prescribe gabapentin to treat seizures or chronic nerve pain in pets and large animals. The recommended dose is 5-10 mg per kilogram of body weight (2.3-4.5 mg/lb) every 12 hours, but dosing will vary between veterinarians. Gabapentin dosages can vary from 3 to 11 mg per kilogram (1.4 to 5 mg per pound) as an analgesic to 10 to 30 mg mg per kilogram (4.5 to 13.6 per pound) as an anticonvulsant. As with people, the dose may start small and steadily increase until an effective dose is reached.

What Diseases Gabapentin can treat ?

Gabapentin was developed to treat epilepsy, but it is now used to treat various forms of chronic pain. It works by reducing the number of signals sent through the nerves. If the signals are reduced then the pain will be reduced. Research has shown that Gabapentin can help in treating various types of nerve pain.

Some Research Team performed searches to look for clinical trials where gabapentin was used to treat neuropathic pain or fibromyalgia. They found that 5633 participants had been involved in 37 studies of reasonable quality. They tested gabapentin against placebo for four weeks or more. Studies lasting only one or two weeks are unhelpful when pain can last for years.

Neuropathic pain is pain coming from damaged nerves. It differs from pain messages carried along healthy nerves from damaged tissue (a fall, cut, or arthritic knee). Neuropathic pain is treated by different medicines than pain from damagedtissue.

Medicines like paracetamol or ibuprofen are not effective in neuropathic pain, while medicines that are sometimes used to treat depression or epilepsy can be very effective in some people with neuropathic pain. Our understanding of fibromyalgia (a condition of persistent, widespread pain and tenderness, sleep problems, and fatigue) is poor, but fibromyalgia can respond to the same medicines as neuropathic pain.

Gabapentin and Fioricet are not recommended for a long term use. If you want to reduce your pain for a long time purpose, we suggest you to take some anti-aging products and natural Pain relief products.

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