← All Medications
Neuropathic Pain

Gabapentin & Pregabalin: Nerve Pain Medication Guide

Gabapentin and pregabalin are widely prescribed for nerve pain, epilepsy, and anxiety. Understanding their sedation risks, dependence potential, and correct use is essential.1

Written and clinically reviewed by Suman Konda, PharmD, Clinical Pharmacist · Editorial policy · Not medical advice

Last reviewed and updated: · How we check our content

Used for
Nerve pain, epilepsy, anxiety
Main risk
Sedation + dependence
Controlled drug
Pregabalin (UK): Class C
Never stop
Abruptly: seizure risk

What They Treat

ConditionGabapentinPregabalin
Neuropathic pain (diabetic, post-herpetic)YesYes (more evidence)
Epilepsy (adjunct)YesYes
Generalised anxiety disorderOff-labelLicensed in UK/EU
FibromyalgiaOff-labelYes (licensed in some countries)
Restless legs syndromeOff-labelOff-label
Alcohol withdrawalSometimesOff-label
Addiction RiskPregabalin (and to a lesser extent gabapentin) has significant misuse and dependence potential. Both are now controlled in the UK. Do not increase your dose without medical guidance. Stopping abruptly can cause seizures, anxiety, and withdrawal syndrome.

Common Side Effects

  • Dizziness (very common, especially when starting)
  • Sedation and cognitive slowing ('gabapentin fog')
  • Weight gain
  • Blurred vision
  • Coordination problems / falls risk in elderly
  • Peripheral oedema (ankle swelling)
Driving WarningDo not drive when first starting gabapentin or pregabalin, or after any dose increase. The sedation and dizziness can be severe enough to impair driving. This is a legal requirement in many countries.

Dosing Schedule (Gabapentin)

WeekDoseTiming
Week 1300 mgNight only
Week 2300 mgTwice daily
Week 3+300 mgThree times daily
Titrate if neededUp to 3600 mg/dayIn divided doses (max 1200 mg/dose)
Is gabapentin the same as pregabalin?
They have the same mechanism of action but pregabalin has more predictable absorption, faster onset, and is more potent. Pregabalin is considered more effective for anxiety and more prone to misuse.
Why are they controlled drugs now?
After evidence of widespread misuse (especially pregabalin for recreational 'high' when combined with opioids), pregabalin became a Class C controlled drug in the UK in 2019. Gabapentin followed. This means restricted prescribing rules apply.
How do I stop gabapentin/pregabalin safely?
Taper by no more than 25% per week. Stopping abruptly can cause withdrawal: insomnia, anxiety, sweating, tremor, and in severe cases, seizures. Tell your doctor if you want to stop.
Numbness & TinglingNerve symptom causes

Dependence, tolerance, and how to stop safely

Both gabapentin and pregabalin carry a risk of physical dependence, particularly at higher doses and with prolonged use. The UK Medicines and Healthcare products Regulatory Agency (MHRA) reclassified both drugs as Class C controlled substances in 2019 because of misuse potential and a rising number of deaths – particularly in combination with opioids, benzodiazepines, or alcohol, all of which amplify CNS depression.

Tolerance can develop over weeks to months: the dose that initially controlled pain may need to be increased to maintain the same effect. This is distinct from addiction (compulsive use despite harm) but is medically significant because abrupt stopping can cause a withdrawal syndrome resembling benzodiazepine withdrawal: anxiety, insomnia, sweating, tremor, palpitations, and rarely seizures.

The recommended approach to stopping is a slow taper – typically reducing by no more than 10–25% of the current dose per week, or even more slowly in patients who have been on high doses for years. There is no universally agreed protocol; always discuss tapering with your prescriber rather than stopping abruptly.

Drug interactions to watch

The most dangerous interaction is with other central nervous system depressants:

  • Opioids: The combination dramatically increases the risk of fatal respiratory depression. Coroners in the UK and USA have consistently identified this combination in overdose deaths. If you are prescribed both, keep doses as low as effective, and ensure family members know where any naloxone (opioid reversal agent) is kept.
  • Benzodiazepines: Combined sedation risk; avoid alcohol on this combination.
  • Alcohol: Potentiates sedation; driving risk significantly increased.
  • Morphine (for gabapentin specifically): Morphine increases gabapentin blood levels by about 44% – a dose reduction of gabapentin may be needed when morphine is added.

What blood tests are needed on gabapentinoids?

Gabapentin and pregabalin are excreted unchanged by the kidneys. In chronic kidney disease (CKD), doses must be reduced proportionally to eGFR – otherwise drug accumulates and sedation/toxicity worsen. A baseline creatinine and eGFR should be checked before starting and monitored annually (or more often if CKD is present or progressing). There are no liver function tests required as these drugs are not hepatically metabolised.

References

Sources cited on this page. PubMed links open the original abstract.

  1. Wiffen PJ, Derry S, Bell RF, et al. Gabapentin for chronic neuropathic pain in adults. Cochrane Database Syst Rev. 2017;6:CD007938. PMID 28597471 · doi:10.1002/14651858.CD007938.pub4

Related reading

Medical Disclaimer: This page is for general education only and does not replace professional medical advice. Always consult a qualified healthcare provider.
Content written and reviewed by Suman Konda, PharmD, Clinical Pharmacist · Telangana State Pharmacy Council · Sources linked to PubMed · Not medical advice – see our disclaimer