Gabapentin Side Effects: What to Know Before Starting

8 min read

Last updated November 10, 2026

The most common gabapentin side effects are drowsiness, dizziness, tiredness and unsteady walking. Many people also notice blurred vision, swelling in the feet or weight gain.

Gabapentin can rarely cause serious breathing problems, especially with opioids or other sedating medicines. It may also affect mood, and stopping suddenly can cause withdrawal.

This guide explains what to expect before you start, how to handle common effects and which signs need urgent care.

Health note. This article shares general information, not medical advice. Take gabapentin exactly as prescribed and talk to your doctor or pharmacist before making any change.

Key Takeaways

Gabapentin treats certain seizures and nerve pain after shingles.
Drowsiness and dizziness are the most common side effects.
Avoid driving until you know how gabapentin affects you.
Combining it with opioids or alcohol raises breathing risks.
Never stop suddenly, since withdrawal and seizures can occur.

Jump to a section

What gabapentin treats
Common side effects
Managing side effects
Breathing problem warning
Mood changes
Stopping gabapentin
Alcohol and medicine interactions
When to get help
Frequently asked questions

What Gabapentin Treats

Gabapentin belongs to a group of medicines called anticonvulsants. MedlinePlus says doctors use it to treat seizures in people with epilepsy, along with other medicines.

Seizures in epilepsy, together with other medicines
Nerve pain after shingles, called postherpetic neuralgia
Restless legs syndrome, using an extended-release form

The NIH neurology institute lists gabapentin enacarbil as a treatment for moderate to severe restless legs syndrome.

Doctors sometimes prescribe gabapentin off-label for diabetic nerve pain and hot flashes, according to MedlinePlus. Many people take a generic version, which our generic vs brand-name guide explains.

Common Gabapentin Side Effects

MedlinePlus lists these common side effects. Tell your doctor if they are severe or do not go away.

Side effect	What you may notice
Drowsiness and tiredness	Feeling sleepy or low on energy
Dizziness	Feeling light-headed, especially when standing
Unsteadiness	Clumsy walking or poor balance
Vision changes	Blurred or double vision
Memory problems	Trouble focusing or remembering
Stomach upset	Nausea, vomiting or constipation
Swelling	Puffy hands, feet or ankles
Weight gain	Slow gain over weeks or months
Headache and anxiety	Mild head pain or feeling on edge

Many people find drowsiness and dizziness ease after the first few weeks. Your doctor may raise the dose slowly to help your body adjust.

1 in 500People in studies of anticonvulsants who had suicidal thoughts or behavior, per MedlinePlus.

Managing Common Side Effects

Avoid driving or using machinery until you know how gabapentin affects you, as MedlinePlus advises.
Stand up slowly from sitting or lying down to reduce dizziness.
Clear clutter and use night lights to prevent falls.
Ask your doctor whether taking a dose at bedtime could help with daytime sleepiness.
Raise swollen feet and tell your doctor about new swelling.
Eat balanced meals and stay active to manage weight.

Keep a short diary of side effects and when they happen. It helps your doctor decide whether to adjust your treatment.

Quick tip. If you take antacids like Maalox or Mylanta, MedlinePlus says to take them at least 2 hours before gabapentin.

If you take gabapentin, which side effect is most common for you?

Drowsiness
Dizziness
None that I notice
Not sure

The Breathing Problem Warning

In December 2019, the FDA warned about serious breathing problems with gabapentin and similar medicines. The risk is higher in certain groups.

Higher Risk Groups

People who also take opioid pain medicines
People taking other sedating medicines, such as benzodiazepines, some antihistamines, anti-anxiety medicines or antidepressants
People with lung disease, such as chronic obstructive pulmonary disease (COPD)
Older adults

Warning Signs

Confusion or disorientation
Unusual dizziness or light-headedness
Extreme sleepiness
Slow, shallow or difficult breathing
Bluish lips, fingers or toes
Being hard to wake

Call 911 if someone has trouble breathing or you cannot wake them. MedlinePlus gives the same advice.

Mood Changes and Suicidal Thoughts

Medicines in this group can affect mental health. MedlinePlus notes that about 1 in 500 people in studies developed suicidal thoughts, sometimes within a week of starting.

Contact a doctor promptly if you or a loved one notices any of these.

New or worse depression or anxiety
Panic attacks or agitation
New irritability or anger
Unusual changes in behavior
Thoughts of self-harm

Share this list with a family member, since others may notice changes before you do. If you have thoughts of harming yourself, call or text 988 in the United States right away.

Stopping Gabapentin Safely

Do not stop gabapentin on your own. MedlinePlus warns that stopping suddenly can cause withdrawal symptoms like anxiety, trouble sleeping, nausea, pain and sweating.

For people with epilepsy, stopping abruptly may also bring on more seizures. Your doctor will lower the dose gradually, usually over at least a week.

Alcohol and Medicine Interactions

MedlinePlus warns that alcohol can add to the drowsiness gabapentin causes. Together they make falls, car crashes and breathing problems more likely.

Tell your doctor about every medicine, vitamin and supplement you take.
Ask before taking sleep aids or allergy medicines that cause drowsiness.
Be careful with opioids, which raise breathing risks.
Ask your pharmacist to check for interactions.

Thinking about a sleep supplement? Read our guide on whether melatonin is safe and ask your pharmacist first. Our guide on how to read a Drug Facts label helps you spot drowsy ingredients in store products.

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Your First Weeks on Gabapentin

The first few weeks are when side effects show up most. Plan ahead to make the start easier.

Start on a day when you do not need to drive.
Take your first doses at home, where you can rest.
Ask someone to check on you if you live alone.
Write down how you feel each day for the first two weeks.

Bring those notes to your follow-up visit. They help your doctor judge whether the medicine is working and safe for you.

Questions to Ask Your Doctor

How long until I notice pain or seizure relief?
Which side effects should make me call you?
Is it safe with my other medicines?
Can I drink any alcohol?
What should I do if I miss a dose?
How would we stop this medicine if needed?

Gabapentin Myths and Facts

Myth	Fact
It works like a regular painkiller	It treats nerve pain and seizures, not everyday aches
You can stop any time	Stopping suddenly can cause withdrawal and seizures
Drowsiness means it is not working	Drowsiness is a common side effect, especially early on
It is safe with any sleep aid	Other sedating medicines raise breathing risks

Living Well With Nerve Pain

Medicine is only one part of managing nerve pain. Gentle daily habits can help you feel more in control.

Stay active with short walks or stretching your doctor approves.
Use warm or cool packs if they ease your pain.
Ask about physical therapy or support groups.

Tell your care team how pain affects your sleep, work and mood. That helps them choose the right mix of treatments.

Gabapentin and Older Adults

Older adults are more likely to feel dizzy or unsteady, which raises fall risk. The FDA also lists older adults among those with higher breathing risk.

Family members can help by watching for confusion or extra sleepiness, especially after a dose change.

Safe Storage and Disposal

Keep gabapentin in its original container, away from heat, moisture and children. Our guide on how to store medicines at home covers the basics.

When you no longer need it, dispose of leftover pills safely. See how to dispose of old medicines.

When to Get Help

Call your doctor right away for a rash, itching, hoarseness, or new or worse mood changes.

Get emergency care for any of these.

Swelling of the face, lips, tongue or throat
Trouble breathing or swallowing
Bluish skin or lips
Extreme sleepiness or being hard to wake
A seizure

If someone may have taken too much, call Poison Help at 1-800-222-1222 in the United States. Call 911 if they are not breathing well or cannot be woken.

Your Gabapentin Checklist

Take it exactly as prescribed
Skip driving until you know how it affects you
Avoid alcohol unless your doctor approves
Tell your doctor about opioids and sleep aids
Watch for mood changes
Never stop suddenly

Try this today. Write a list of every medicine and supplement you take. Ask your pharmacist to check it against gabapentin.

Test Yourself

Which combination raises the risk of serious breathing problems with gabapentin?

Gabapentin and vitamin C
Gabapentin and opioids
Gabapentin and water

The FDA warned that combining gabapentin with opioids or other sedating medicines raises the risk of serious breathing problems.

Frequently Asked Questions

Do gabapentin side effects go away?

Drowsiness and dizziness often ease after a few weeks. Tell your doctor if they continue.

Can gabapentin cause weight gain?

Yes. MedlinePlus lists weight gain and swelling among the possible side effects.

Can I drink alcohol with gabapentin?

Alcohol adds to drowsiness and can be risky. Ask your doctor before drinking.

What happens if I stop gabapentin suddenly?

You may have withdrawal symptoms, and seizures may increase. Your doctor should lower the dose slowly.

Conclusion

Gabapentin often causes drowsiness and dizziness at first, and these usually improve. Watch for breathing problems, mood changes and swelling, and never stop the medicine suddenly.

Bring your questions and full medicine list to your next appointment so your doctor can keep treatment safe.

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Editor’s Note

This guide is accurate as of November 10, 2026. Medicine details come from MedlinePlus. The FDA breathing warning summary comes from the Indian Health Service, and restless legs details come from the NIH.

This is general information, not medical advice. Talk to a health professional about your own treatment.

Spot an error in this article? Please contact us at support@digieh.com or read our Corrections Policy.

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