Gabapentin and Pregabalin are both antiepileptic medications used to treat nerve pain and seizures, but they have some differences. Gabapentin is available as a lower-cost generic and is typically taken three times a day, while pregabalin is also available as a generic but is usually taken two or three times a day. Gabapentin is approved for nerve pain from shingles and as an add-on for partial seizures, whereas pregabalin is approved for nerve pain from diabetes, shingles, spinal cord injury, fibromyalgia, and partial-onset seizures. Pregabalin is a Schedule V controlled substance due to its potential for addiction, while gabapentin is controlled in some states but not federally. Both medications can cause dizziness and drowsiness, but pregabalin also commonly causes swelling and weight gain. Gabapentin can lead to serious skin reactions and suicidal thoughts, while pregabalin can cause angioedema and has a risk of muscle breakdown. Both medications require careful monitoring and should not be stopped suddenly to avoid withdrawal symptoms.
What is Gabapentin?
Gabapentin, also known by its brand name Neurontin, is used to treat nerve pain from shingles in adults. This medication can also help treat partial (focal) seizures in adults and children. Gabapentin (Neurontin) comes as pills and a liquid that you take by mouth. The dosage depends on things like what you're treating, how old you are, and how well the medication is working. In general, you take it 3 times a day. Common side effects include making you feel dizzy and sleepy.
What is Pregabalin?
Pregabalin helps treat nerve pain and fibromyalgia in adults. It can also be taken with other medications to help treat certain seizures in people 1 month and older. Pregabalin comes as a capsule and oral solution in both brand-name and generic versions. The dosage depends on what condition you're treating, but it's usually taken by mouth 2 or 3 times a day. Common side effects include feeling dizzy and drowsy. This medication is a controlled substance and has interactions, like with alcohol and benzodiazepines.
What are the main differences between Gabapentin and Pregabalin?
Pregabalin is a brand name for pregabalin. Gabapentin is a generic drug, and brand names include Neurontin and Gralise. Gabapentin enacarbil (brand name Horizant) is a prodrug of gabapentin and is not the same as gabapentin itself and is not interchangeable with Gralise (a once-daily gabapentin formulation). Although Pregabalin, gabapentin, and gabapentin enacarbil all belong to the same class of medicine (gabapentinoids) and work similarly, they are not the same drug and are not interchangeable without a doctor's guidance.
What are the side effects of Gabapentin vs Pregabalin and safety differences?
Gabapentin vs Pregabalin share many side effects because they work on similar nerve pathways. Common effects include drowsiness or sleepiness, dizziness, weight gain, peripheral edema (swelling), blurred vision, dry mouth, and constipation. The frequency and severity can differ by person and dose. Some reports find pregabalin more likely to cause weight gain and swelling. At the same time, gabapentin’s side effects can be dose-related. Rare but serious reactions include allergic responses and a small risk of new or worsening suicidal thoughts; any sudden mood change, severe rash, or breathing trouble requires immediate medical attention. Patients should weigh the benefits against the side effects when discussing options with a healthcare provider.
Approved uses
Both Pregabalin and gabapentin are used as anti-epileptic medications and to treat neuropathic pain.
- Pregabalin is FDA-approved for neuropathic pain associated with diabetic peripheral neuropathy, postherpetic neuralgia, spinal cord injury, and fibromyalgia.
- Gabapentin (Neurontin) is approved for postherpetic neuralgia (shingles pain) and partial seizures, and is widely used off-label for a range of other conditions.
- Gabapentin enacarbil (Horizant) is separately approved for restless legs syndrome (RLS) and postherpetic neuralgia.
Absorption speed
Pregabalin is absorbed more predictably and works faster than gabapentin. Pregabalin reaches peak concentration in the blood within approximately 1 hour of being taken, whereas gabapentin takes 3 to 4 hours to reach peak concentration. Pregabalin also has more linear, predictable pharmacokinetics, meaning its effects are more consistent across doses compared to gabapentin.
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