Pregabalin vs Gabapentin: Compare Differences & Prices

When choosing between pregabalin and gabapentin for conditions such as nerve pain or certain types of seizures, understanding the potential side effects of each medication is an important part of decision-making. While both of these drugs work in similar ways and have a number of side effects in common, patients may find that their experiences with these medications differ in some key ways.

Both pregabalin and gabapentin commonly cause side effects like drowsiness and dizziness. These sensations can make you feel tired or less alert than usual, which is why it's important to avoid activities such as driving or operating heavy machinery until you know how the medication affects you. Swelling in the arms or legs, known as edema, can also occur with either medication, particularly with longer-term use.

Some side effects differentiate the two drugs:

• Weight gain is reported with both pregabalin and gabapentin, but pregabalin tends to cause a higher risk of weight gain not solely related to fluid retention. With gabapentin, any weight gain is more likely to be due to increased fluid buildup.

• Vision problems, dry mouth, and mild difficulties with memory or coordination have been noted in people taking either medication.

• Nausea and vomiting are more likely to occur with gabapentin compared to pregabalin. The difference is noticeable: studies have shown the risk of experiencing these digestive issues is almost three times higher with gabapentin than with pregabalin.

There are also some rare but serious side effects to consider. Both medications carry a risk—though low—of causing or worsening suicidal thoughts and behaviors. This risk can appear at any point during treatment. In addition, both drugs can occasionally cause severe allergic reactions, such as swelling of the face, mouth, or throat (also known as angioedema). Gabapentin has been linked, in rare cases, to a reaction called DRESS syndrome, which involves widespread rash, fever, and other organ involvement. If you notice new rashes, swelling, fever, or changes in mood or behavior, it is important to seek medical help right away.

Other key safety points include:

• Both drugs can cause withdrawal symptoms if stopped abruptly, such as nausea, agitation, sweating, and, in people using them for seizures, an increased risk of seizures returning.

• The risk of side effects like sedation and breathing problems increases if either drug is taken together with substances that slow down brain activity—such as opioid painkillers, anti-anxiety medications, certain antihistamines, or alcohol.

• There may be a slightly higher short-term risk of heart problems with gabapentin compared to pregabalin, especially in people with existing heart disease.

It’s important to note that while serious side effects are uncommon, the overall side effect profile may influence a person’s ability to stick with one medication over the other. Extended-release forms of either drug are also available and may slightly reduce the risk of some side effects, such as sleepiness or dizziness.

In summary, pregabalin and gabapentin share many common side effects, including sleepiness, swelling, and dizziness. Pregabalin is more likely to cause weight gain, while gabapentin tends to cause more nausea and vomiting. Both medications should be started and stopped under the close supervision of a healthcare provider, and any unusual or severe side effects should be promptly discussed with your doctor. Every individual responds differently, so an open conversation about side effects and ongoing monitoring is essential in finding the best treatment for your needs.

When deciding between Pregabalin and Gabapentin, understanding which conditions each medication is approved to treat—and how they’re commonly used—can help patients and caregivers make more informed choices with their healthcare provider.

Both pregabalin and gabapentin belong to a group of drugs known as gabapentinoids. They are mainly used to treat nerve pain and certain types of seizures. In the United States, gabapentin is specifically approved (by the Food and Drug Administration) for:

• Partial-onset seizures in adults and children three years of age and older

• Nerve pain that occurs after shingles, also called postherpetic neuralgia

Pregabalin is approved for similar uses, but it has a broader range of official approvals. In addition to partial-onset seizures (for adults and children as young as one month old) and postherpetic neuralgia, pregabalin is also approved to treat:

• Nerve pain associated with diabetes, known as diabetic neuropathy

• Nerve pain resulting from spinal cord injuries

• Fibromyalgia, a condition that causes widespread pain and tenderness, often along with fatigue and sleep problems

Because pregabalin is approved for more conditions by regulatory agencies, it’s sometimes chosen when a patient has one of these specifically listed issues. Gabapentin, on the other hand, is often considered for nerve pain after shingles or as an additional medication for certain seizures, particularly in older children and adults.

While those are the official approved uses, doctors often prescribe pregabalin and gabapentin to treat other problems, a practice called “off-label” use. Off-label means a drug is used for a condition that it’s not formally approved to treat, but for which there is some medical experience or evidence to suggest it can be helpful. Common off-label uses for both medications include:

• Various other types of nerve pain, such as that caused by back problems or neuropathy not related to diabetes or shingles

• Restless legs syndrome

• Anxiety, especially generalized anxiety disorder

• Insomnia (trouble sleeping)

• Symptoms related to menopause, such as hot flashes

• Headaches, particularly certain types of chronic or nerve-related headaches

• Alcohol use disorder, to help reduce withdrawal symptoms

It’s important to note that, although gabapentin is not officially approved for diabetic neuropathy or fibromyalgia, it is still used for these conditions in many situations. In fact, gabapentin is sometimes chosen as a first-line therapy for nerve pain linked to diabetes, despite its off-label status for this specific use.

The decision between pregabalin and gabapentin can depend on a patient’s specific condition, the severity and type of their symptoms, and personal factors like age or other health concerns. For instance, research suggests that pregabalin may provide faster pain relief in some cases, which could be significant for people dealing with severe or rapidly worsening symptoms. On the other hand, gabapentin might be recommended for some menopause-related symptoms, in part because there is less available research on using pregabalin for that purpose.

In summary, while gabapentin and pregabalin overlap in treating nerve pain and certain types of seizures, pregabalin has more approved uses and may be favored for some conditions such as fibromyalgia, diabetic neuropathy, and nerve pain after spinal cord injuries. Both medications are frequently prescribed for health problems outside their official approvals, based on clinical experience and a patient’s unique needs. If you are considering either of these medications, it’s best to discuss your full set of symptoms and medical history with your doctor, who can help decide which option is most appropriate for your individual situation.