Gabapentin is not universally classified as a high-risk medication, but it carries serious risks for specific groups of people. The FDA issued a safety warning about life-threatening breathing problems in patients who combine gabapentin with opioids or have lung conditions, and the American Geriatrics Society flags it as potentially inappropriate for older adults. Several U.S. states have reclassified it as a controlled substance due to growing concerns about misuse and overdose deaths.
Why Gabapentin’s Risk Profile Has Changed
For years, gabapentin was considered a relatively safe alternative to opioids for nerve pain and seizures. It was originally designed as a synthetic version of GABA, a calming brain chemical, but researchers later discovered it doesn’t actually affect GABA receptors at all. Instead, it works by reducing the number of calcium channels on nerve cells, which dampens the overactive signaling responsible for seizures and certain types of pain.
That indirect mechanism made gabapentin seem gentler than drugs that directly suppress the central nervous system. But as prescriptions skyrocketed, particularly for off-label uses like anxiety and general pain, real-world data revealed risks that clinical trials hadn’t fully captured. The combination of widespread prescribing, misuse potential, and dangerous interactions with opioids has pushed gabapentin into a much more cautious category.
The FDA’s Breathing Warning
The FDA’s most significant safety alert came in 2019, warning that gabapentin can cause serious breathing difficulties, including respiratory depression, in certain patients. The people most at risk include those who take opioid pain medications or other drugs that slow the central nervous system, people with chronic lung conditions like COPD, and older adults.
A large population-based study published in PLOS Medicine put hard numbers on the opioid interaction: people prescribed both gabapentin and opioids had a 49% higher risk of dying from an opioid overdose compared to those on opioids alone. At moderate and high doses of gabapentin, that risk climbed to roughly 60%. These aren’t rare edge cases. Gabapentin is frequently prescribed alongside opioids, which is exactly the combination that proved most dangerous.
Risks for Older Adults
The 2023 Beers Criteria, the standard reference for medications that may be inappropriate in people 65 and older, includes gabapentin in multiple warning categories. For older adults with reduced kidney function (creatinine clearance below 60), the recommendation is to reduce the dose because the drug accumulates in the body and amplifies side effects like drowsiness, confusion, and unsteadiness.
The bigger concern is falls. Gabapentin is listed among drugs that can cause impaired coordination, dizziness, and fainting in older adults, particularly those with a history of falls or fractures. When gabapentin is combined with two or more other drugs that affect the central nervous system (antidepressants, benzodiazepines, opioids, sleep aids, or muscle relaxants), the fall and fracture risk increases substantially. The Beers Criteria recommends avoiding combinations of three or more of these drug types in older patients.
Kidney Function Matters
Gabapentin is eliminated almost entirely through the kidneys, so any decline in kidney function means the drug stays in your system longer and builds to higher levels. The FDA-approved label lays out a clear dose reduction schedule: someone with normal kidney function might take up to 3,600 mg daily split into three doses, while someone with moderately reduced kidney function should take no more than 1,400 mg split into two doses. For severe kidney impairment, the maximum drops to 700 mg taken once daily, and people on dialysis need even lower amounts with a supplemental dose after each session.
When doses aren’t adjusted properly, the drug accumulates and can cause excessive sedation, difficulty breathing, and toxicity. This is especially relevant for older adults, whose kidney function naturally declines with age, sometimes without any obvious symptoms.
Misuse and Controlled Substance Status
Gabapentin misuse is more common than many people realize. In the general population, about 1% of people report having misused gabapentin. But among people with opioid use disorders, that number jumps to 15 to 22%. Among people who have gabapentin prescriptions and also struggle with substance use, 40 to 65% report taking more than prescribed or using it in ways not intended.
This pattern has prompted a patchwork of state-level regulation. As of the end of 2024, seven U.S. states classify gabapentin as a Schedule V controlled substance: Alabama, Kentucky, North Dakota, Tennessee, Utah, Virginia, and West Virginia. Kentucky was the first to act in 2017. An additional 17 states require gabapentin prescriptions to be reported to their prescription drug monitoring programs without formally scheduling the drug. Michigan briefly scheduled gabapentin in 2019 but reversed the decision in 2024. Federally, gabapentin remains unscheduled.
Withdrawal Can Be Severe
Stopping gabapentin abruptly after regular use can trigger withdrawal symptoms, even in people taking it as prescribed. The risk increases with higher doses and longer use. Symptoms can include anxiety, insomnia, nausea, sweating, and in some cases seizures, which is particularly dangerous for people who take gabapentin to control epilepsy.
Most people can taper off gabapentin over a few weeks without major problems. But for those who develop significant physical dependence, the process can take much longer. Published case reports describe tapers lasting many months, with dose reductions as small as 5 mg at a time near the end. The key point is that gabapentin should never be stopped cold turkey, and anyone who has been taking it regularly should work out a gradual reduction plan.
Who Faces the Highest Risk
Gabapentin is safe enough for many people when used at appropriate doses for the right conditions. The risk profile shifts dramatically based on a few key factors:
- People taking opioids: The 49% increase in overdose death risk makes this the single most dangerous combination.
- Older adults: Reduced kidney function, higher fall risk, and the likelihood of taking multiple central nervous system drugs all compound the danger.
- People with lung disease: Conditions like COPD already compromise breathing, and gabapentin can suppress respiratory drive further.
- People with a history of substance use disorders: Misuse rates are dramatically higher in this group, and gabapentin can enhance the effects of opioids and other sedating drugs.
- People with kidney impairment: Without proper dose adjustments, the drug builds up to toxic levels.
For a healthy adult taking gabapentin alone at a standard dose for nerve pain or epilepsy, the medication is generally well tolerated. But the growing recognition that gabapentin is not risk-free, especially in combination with other medications, is why regulators and prescribers treat it with increasing caution.