Doctor Won't Prescribe Gabapentin And Lyrica Together
In our latest Q+A, the pharmacist answers a question regarding a doctor refusing to prescribe gabapentin and Lyrica together.
I have been taking Lyrica 75mg with gabapentin 400mg, three times a day, for three months. Since my GBS diagnosis four years ago, I have been experiencing some pain relief. My doctor believes there is a significant risk of side effects when taking these medications together, and is refusing to prescribe them again. Since I have stopped taking Lyrica, my hands have become numb and it is difficult for me to type. Can you please advise me on what to do?
Last updated Jan 22, 2023
- Gabapentin and Lyrica are similar medications and work by binding to specific sites in the brain and spinal cord.
- Lyrica is believed to be more potent than gabapentin and has a longer duration of action.
- Both Lyrica and gabapentin have a potential for abuse and misuse. Lyrica is a federally scheduled controlled substance (Schedule V) while gabapentin is a controlled substance in some states.
- Despite the fact that some studies have shown that the combination of Lyrica and gabapentin can be effective, there is limited evidence overall and the use of both medications together may increase the risk of side effects, such as sedation, dizziness, and confusion. In many cases, their combined use would be considered a therapeutic duplication.
Thanks so much for reaching out to us! We answered a question very similar to this not too long ago, and in it, we described why it's very uncommon that gabapentin and Lyrica (pregabalin) would be used together.
In a nutshell, Lyrica (pregabalin) and gabapentin are very similar drugs (both are classified as gabapentinoids), and essentially work the same way.
Although the precise mechanism by which both drugs work isn't completely known, they are thought to work at least partially by binding to a specific site on the alpha-2-delta subunit of voltage-gated calcium channels in the brain and spinal cord. This has multiple effects, including altering the release of glutamate, which causes a reduction in the sensation of pain.
Two big differences between Lyrica and gabapentin, however, are their potencies and duration of action:
- Lyrica (pregabalin) is more rapidly absorbed than gabapentin and tends to work faster. It is also more potent. Animal studies have reported that it is likely 3-10 times as potent as gabapentin.
- Lyrica (pregabalin) can often be dosed less frequently due to its longer duration of action.
Now, I won't go too in-depth here regarding the differences between these drugs because that's not what you asked about. I'll focus on their combined use and why your doctor is hesitant to prescribe both together.
Concerns Combining Gabapentin And Lyrica
As mentioned, Lyrica and gabapentin are both gabapentinoids and work in a similar manner. In most cases, taking both together would be considered a duplication of therapy, similar to how taking two different antihistamines, like Claritin and Zyrtec, would be considered a duplication of therapy.
The primary concern here is although some very small studies have shown that the combination of Lyrica and gabapentin can be effective in treating neuropathic pain, the use of both medications together may increase the risk of side effects, such as:
- Shortness of breath
- Dry mouth
- Speech problems
- Difficulty concentrating
Adding concern to this is the fact that Lyrica is a federally assigned controlled substance (Schedule V) and gabapentin is a Schedule V controlled substance in some states (e.g., Alabama, Kentucky, Michigan, Virginia. West Virginia, etc...). I can certainly understand your doctor being hesitant to prescribe two drugs with the potential of abuse and misuse where there is no clear evidence that their combined use is safe and effective.
I did mention that there are some studies that show some preliminary evidence of benefit with combined use. One such study stated the following:
Despite their [gabapentin and pregabalin] similarities, they have been used in combination in both clinical and research situations, and have been noted to have a synergistic effect in pain control without concern for clinically significant pharmacokinetic interactions. This combined approach can be made use of to reduce the dose of an individual agent, its side effects, and to enhance therapeutic response compared to a single agent.
To reiterate, I can understand why your doctor wouldn't want to prescribe both gabapentin and Lyrica. While there is some evidence for combined use, there is little data available to properly evaluate the safety and efficacy of the regimen. Throw in the fact that you're talking about controlled substances, it makes it more reasonable not to potentially over-prescribe.
I don't know your medical or medication history, so the following are just some general thoughts for you. I would think the safer, and more evidence-based approach would be to try either gabapentin or Lyrica and dose-titrate up until you (hopefully) achieve a clinical response.
You mentioned you tried gabapentin at 400mg and Lyrica at 75mg. Both drugs can be dosed far higher (pregabalin has been studied up to 600mg per day and gabapentin up to 3,600mg per day), so that may be an option for you.
Thanks so much again for reaching out.
I am sorry to hear of the problems you are having treating your pain. I hope you are able to have a discussion with your doctor to come up with a treatment plan that brings you closer to some kind of relief.
- Is there a role for combined use of gabapentin and pregabalin in pain control? Too good to be true?, PubMed
- A comparison of the pharmacokinetics and pharmacodynamics of pregabalin and gabapentin, PubMed
- Effect of Gabapentin vs Pregabalin on Pain Intensity in Adults With Chronic Sciatica, PubMed
- Pregabalin: new drug. Very similar to gabapentin, PubMed
- Dr. Brian Staiger, PharmD
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