Short & Long-Term Effects of Gabapentin

Gabapentin, widely known by its brand name Neurontin, is a medication prescribed for nerve pain, seizures, and off-label uses like anxiety and restless leg syndrome. 

 

This article outlines the timeline of gabapentin’s physical and mental effects, covering common side effects, the potential for dependence, and what research says about the long-term use of gabapentin.

What Is Gabapentin and How Does It Work?

Gabapentin is a medication that treats nerve pain and some types of seizures [1]. It is sold under the brand name Neurontin and is approved by the FDA for partial seizures and postherpetic neuralgia, which is pain that occurs after shingles. Gabapentin works by calming overactive nerves, reducing seizures, and easing nerve pain.

 

Doctors often prescribe gabapentin for other conditions that are not officially approved, such as diabetic neuropathy, restless legs syndrome, fibromyalgia, and alcohol withdrawal. It is commonly recommended for diabetic nerve pain and shingles pain. While generally considered well-tolerated, it is important to be aware of side effects from both short-term and long-term use. Since the kidneys eliminate the drug from the body, patients with kidney disease may need dose adjustments to avoid toxic levels [2]. 

Short-Term Side Effects of Gabapentin

The most common short-term side effects of gabapentin are drowsiness (sleepiness) and dizziness, especially when first starting the medication or increasing the dose [3]. These initial reactions can impair your ability to drive or operate machinery and are often most intense during the first few days.

 

Many patients also report the following initial side effects:

• Unsteadiness or ataxia: Trouble with coordination can make walking or fine motor tasks more difficult.

• Headache and vision changes: Headaches and blurred or double vision (diplopia) are also common.

• Cognitive fuzziness: Some people experience temporary memory lapses or confusion, sometimes described as amnesia or abnormal thinking.

• Gastrointestinal issues: Nausea, vomiting, constipation, and diarrhea can occur.

 

To manage these effects, doctors typically start with a low dose and increase it gradually. Even at lower doses, sensitive individuals may still notice side effects of gabapentin 300mg, such as sedation or “brain fog.” Side effects like drowsiness and dizziness often improve as your body adjusts to the medication [3]. Taking gabapentin at night can help with sleepiness. It’s also advised to wait several hours between taking gabapentin and antacids, as antacids can reduce its absorption.

 

Long-Term Physical Effects of Gabapentin

The gabapentin long-term side effects often include progressive weight gain, fluid retention (edema), and persistent fatigue [4]. These effects can develop or become more noticeable when the medication is taken for several months or years.

 

• Weight Gain and Edema: Chronic use often leads to a slow but steady increase in weight, which may be partly due to an increased appetite. Many users also notice swelling in their ankles or legs (peripheral edema) over time [1].

• Muscle Function: Muscle weakness, stiffness, or tremors may appear gradually. Gabapentin can cause tremors or mild shaking in the hands, which may persist until the drug is tapered off.

• Kidney Function: Since the kidneys are responsible for clearing gabapentin, long-term use requires monitoring of kidney function. If kidney function declines, the dose may need to be adjusted to prevent the drug from accumulating in the body [2].

• Gabapentin and Blood Pressure: Animal research suggests gabapentin can lower blood pressure. Studies in rats showed that gabapentin caused significant drops in arterial pressure and heart rate [5]. While it’s unclear if this directly translates to humans, it suggests a potential hypotensive effect, especially for those already on blood pressure medication.

• Effects in Women: Hormonal effects are not well-studied, but there are specific considerations for gabapentin side effects in women during pregnancy. Chronic use during pregnancy has been linked to a slight increase in risks for the infant, such as cardiac defects. Gabapentin also passes into breast milk, so breastfed infants should be monitored for drowsiness or poor weight gain.

Long-Term Psychological and Cognitive Effects

Long-term use of gabapentin can lead to ongoing difficulties with memory and concentration, though these effects are typically reversible. Some patients report a mental “cloudiness” or trouble focusing that persists even after years on the medication.

 

• Gabapentin and Memory Loss: Clinical data list amnesia (memory lapses) and abnormal thinking as possible side effects. However, a study found no increased risk of dementia with long-term gabapentin use for chronic pain [6]. The good news is that research suggests memory does come back after stopping gabapentin, as these cognitive issues are usually not permanent.

• Mood Changes: Some individuals may experience irritability, anxiety, or depression with long-term use. Gabapentin has been associated with depression and emotional lability, and all anti-seizure drugs carry an FDA warning about the risk of mood changes and suicidal thoughts.

• Recreational Misuse and the “Gabapentin High”: Gabapentin does not typically produce euphoria like opioids do, but when taken in very high, unprescribed doses, it can cause feelings of relaxation or pleasure, known as a “Gabapentin High.” It can also dangerously amplify the effects of opioids and alcohol. Chronic misuse has been linked to hallucinations and other atypical psychological effects, which become more pronounced in abuse scenarios. This potential for misuse is one reason why some consider gabapentin bad, despite its therapeutic benefits.

Risk of Dependence and Withdrawal

To answer the question, is gabapentin addictive? – No, it is not classified as a federally controlled substance and is generally considered to have a low potential for addiction [1]. It is often prescribed as a safer alternative to opioids for chronic pain. However, being “non-addictive” does not mean it is without risk.

 

Physical dependence can develop with chronic use, meaning the body adapts to the presence of the drug. This is different from addiction, which involves compulsive drug-seeking behavior. If gabapentin is stopped suddenly after long-term use, withdrawal symptoms can occur. These may include rebound anxiety, insomnia, irritability, and, in severe cases, withdrawal seizures [1].

 

Because of increasing reports of misuse, particularly among individuals with a history of substance use disorders, several states have reclassified gabapentin as a Schedule V controlled substance [1]. To avoid withdrawal, it is crucial to taper off the medication slowly under a doctor’s supervision.

Is Gabapentin Safe for Long-Term Use?

Yes, the long-term use of gabapentin is generally considered safe when managed properly by a healthcare provider. Doctors often prescribe gabapentin for years if its benefits in controlling conditions like chronic pain or epilepsy outweigh the risks.

 

Research supports the safety of extended gabapentin use. A two-year clinical trial found that gabapentin was safe and well-tolerated as an add-on therapy for epilepsy, with no unexpected safety concerns [7]. The effectiveness in controlling seizures was maintained throughout the study. While some side effects may persist, they do not tend to worsen over time, and some, like dizziness, often diminish [3].

 

Regular check-ups are essential to monitor for potential issues, including:

• Changes in kidney function.

• New or worsening mental health symptoms.

• Interactions with other medications, especially other sedatives.

Drug Interactions to Be Aware of

Taking gabapentin with other medications can increase the risk of side effects, and some interactions can be dangerous. It’s important to tell your doctor about all medicines, supplements, and over-the-counter drugs you are using.

 

• Opioids and CNS Depressants: The most serious risk comes from mixing gabapentin with central nervous system (CNS) depressants. These include opioid pain medications like oxycodone and morphine, benzodiazepines such as Xanax and Valium, and alcohol. Combining gabapentin with these can cause extreme drowsiness, slow or stopped breathing, coma, and even death. In 2019, the FDA warned about this serious risk, especially for patients with breathing issues [8].

• Antacids: Over-the-counter antacids that contain aluminum and magnesium can lower how well gabapentin works. It’s best to take gabapentin at least two hours after taking these antacids to avoid this problem.

• Other Medications: Other drugs that cause drowsiness might increase the sleepy effects of gabapentin, leading to too much sleepiness and impaired coordination. This includes some antidepressants, antihistamines, and muscle relaxants.

How to Safely Stop Taking Gabapentin

Do not stop taking gabapentin suddenly. Gradually decrease your dose under your doctor’s guidance, a process called tapering. This plan depends on your current dose, how long you’ve been taking it, and your health.

 

Withdrawal symptoms can include:

• Anxiety and agitation

• Insomnia

• Nausea

• Pain

• Sweating

• Confusion

 

Tapering can take a few weeks to several months [9]. Your doctor will create a plan to reduce discomfort and ensure safety. Follow it closely and inform your doctor of any troubling symptoms.

Considerations for Special Populations

Gabapentin can cause more side effects and risks for some people, so doctors must be careful with dosing and monitoring.

• Older people may be more affected by gabapentin, especially feeling dizzy, sleepy, or uncoordinated, which can lead to falls and injuries [10]. This is often because their kidneys don’t work as well, making it harder to clear the drug from their bodies. Doctors usually start older patients on a lower dose and increase it slowly.

• Gabapentin mainly leaves the body through the kidneys. People with chronic kidney disease (CKD) are at risk of the drug building up in their bodies, leading to toxic effects. Their dosage needs to be adjusted based on how well their kidneys are working, usually measured by creatinine clearance. If the dose is not lowered correctly, it can cause serious side effects like confusion, extreme sleepiness, and muscle twitching.

FAQs

How long can you stay on gabapentin?

There is no strict time limit for taking gabapentin; many people use it for years or even for life under medical supervision. As long as the medication remains effective and side effects are tolerable, a doctor may continue the prescription with regular monitoring to ensure its continued appropriateness.

 

Does gabapentin affect your memory long-term?

Gabapentin can cause temporary cognitive slowing or memory gaps, but it is not known to cause permanent memory loss. Research shows these side effects are usually reversible after the medication is reduced or stopped. A large study confirmed that long-term gabapentin use was not associated with an increased risk of dementia.

 

Is it safe to take gabapentin for years?

Yes, it is generally safe to take gabapentin long-term under a doctor’s supervision. Clinical studies have shown that doses up to 2400 mg/day are safe over extended periods, with serious adverse events being rare. Regular check-ups are necessary to weigh the benefits against potential side effects and monitor for any long-term risks.

 

What is the biggest side effect of gabapentin?

The number one side effect of gabapentin is sedation (drowsiness or sleepiness), along with dizziness and coordination issues. These central nervous system effects are dose-dependent and can interfere with daily activities. While other effects like weight gain or tremor can occur, tiredness and dizziness typically have the most significant impact on patients.

 

What are the most serious side effects of gabapentin?

While rare, the most serious side effects of gabapentin can include severe allergic reactions (like rash, hives, or swelling of the face, lips, or throat), trouble breathing, and an increased risk of suicidal thoughts or behavior. If you experience any of these, you should seek immediate medical attention.

 

What are the permanent side effects of gabapentin?

There is currently no strong evidence to suggest that gabapentin causes permanent side effects when used appropriately. The most commonly reported side effects, such as cognitive changes, mood disturbances, and physical symptoms like weight gain or edema, are generally considered reversible and tend to resolve after the medication is discontinued. Ongoing research continues to monitor its long-term impact, but studies have not shown evidence of serious cumulative toxicity.

Get Help for Addiction at Alliance Recovery

If you or a loved one is struggling with gabapentin misuse, dependence, or challenging side effects, specialized support is available. 

Alliance Recovery provides treatment to address both the physical and psychological aspects of gabapentin dependence. Our team can guide you toward recovery, help improve your quality of life, and ensure you manage your medication needs safely. 

 

Call Alliance Recovery at (844) 287-8506 today. 

Sources

[1] https://www.ncbi.nlm.nih.gov/books/NBK493228/

[2] https://www.mayoclinic.org/diseases-conditions/peripheral-neuropathy/in-depth/pain-medications/art-20045004

[3] https://www.mayoclinic.org/diseases-conditions/epilepsy/expert-answers/neurontin-side-effects/faq-20057893

[4] https://pubmed.ncbi.nlm.nih.gov/24771480/

[5] https://pubmed.ncbi.nlm.nih.gov/31879515/

[6] https://pubmed.ncbi.nlm.nih.gov/38729220/

[7] https://pubmed.ncbi.nlm.nih.gov/8088258/

[8] https://www.fda.gov/drug-safety-and-availability/fda-warns-about-serious-breathing-problems-seizure-and-nerve-pain-medicines-gabapentin-neurontin-gralise-horizant-and-pregabalin-lyrica

[9] https://www.aafp.org/pubs/afp/issues/2020/0801/p158.html

[10] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4040042/