What happens when you take levetiracetam with vitamin b6?
Levetiracetam, sold most commonly as Keppra, is one of the most-prescribed anticonvulsants because it works well, has few drug interactions, and does not need blood level monitoring. Its biggest practical drawback is behavioral: a significant minority of patients develop irritability, agitation, anxiety, depression, or outright aggression. Online patient communities have nicknamed this phenomenon "Keppra rage," and it is a leading reason people discontinue the drug.
Over the past 15 years, neurologists and pediatricians have noticed that adding pyridoxine (vitamin B6) sometimes calms these behavioral side effects without sacrificing seizure control. The first signal came from pediatric epilepsy clinics. Researchers reported that adding pyridoxine to children on levetiracetam improved irritability in roughly 40-50% of cases. Later case series in adult patients, including a study in U.S. veterans with epilepsy, found a similar pattern: about 45% of veterans showed improved irritability after pyridoxine was added.
The mechanism is not fully nailed down. The leading hypothesis is that pyridoxal-5-phosphate, the active form of B6, is a required cofactor for the synthesis of GABA, serotonin, and dopamine. Levetiracetam may subtly shift the balance of these neurotransmitters, and supplying extra B6 may help restore equilibrium. This is plausible biochemistry, but it remains a working hypothesis rather than a proven mechanism.
Why is this important?
The randomized trial data are honestly mixed. A double-blind placebo-controlled trial did not find a statistically significant benefit of pyridoxine over placebo for levetiracetam-related behavior. Open-label and retrospective data, meanwhile, consistently report roughly 40-50% response rates. The truth is probably somewhere in the middle: a subset of patients genuinely benefit, but the effect is not universal and there is real placebo response in this kind of subjective outcome.
For an individual patient, that is not a bad risk-benefit. Pyridoxine at modest doses is cheap, widely available, and well-tolerated. The downside risk of a short trial is minimal compared to the alternative of switching from a well-controlled antiepileptic regimen.
That said, pyridoxine is not entirely benign. Chronic high-dose pyridoxine (typically above 200 mg/day for extended periods, though some sources flag risk even at 100 mg/day) can cause a peripheral sensory neuropathy, with symptoms including numbness, tingling, and balance problems. This neuropathy is partially reversible if caught early but can be permanent in severe cases. So the strategy is short-term, dose-conscious, and supervised.
It is also worth saying: if levetiracetam-related behavioral changes are severe, particularly involving suicidal thoughts, self-harm, or unmanageable aggression, the right move is to involve the prescriber promptly rather than to self-treat with a supplement.
What should you do?
If you are doing well on levetiracetam, you do not need pyridoxine. There is no evidence that prophylactic B6 prevents behavioral side effects in patients who never develop them.
If you have noticed new irritability, mood changes, or agitation since starting or escalating levetiracetam, raise it with your prescriber and ask whether a trial of pyridoxine is appropriate. Typical doses in published reports range from 50-100 mg/day in adults, often as a single morning dose, with effects expected within days to a few weeks. In children, dosing is weight-based and should always be set by a pediatric neurologist.
Take pyridoxine with food and do not exceed 100 mg/day long-term without medical supervision. If you develop numbness or tingling in your hands or feet, stop the supplement and tell your doctor.
Do not use pyridoxine as a reason to push through severe behavioral side effects. Sometimes the right answer is a dose reduction or a switch to a different anticonvulsant such as lamotrigine, brivaracetam, or lacosamide.
Which specific products are affected?
On the medication side, this applies to all forms of levetiracetam, including:
- Keppra (immediate-release tablets and oral solution)
- Keppra XR (extended-release)
- Generic levetiracetam tablets and solutions
- Spritam (orally disintegrating tablets)
- Elepsia XR (extended-release)
On the supplement side, the relevant form is pyridoxine hydrochloride (vitamin B6). It is sold as standalone tablets in doses of 25, 50, and 100 mg, and is also included in B-complex supplements and multivitamins. Note that some "high-potency" B-complexes already contain 50-100 mg of B6, which is well above the daily dietary requirement of about 1.3-1.7 mg.
The related supplement pyridoxal-5-phosphate (P5P) is the activated form and is marketed as a more bioavailable option. There is no head-to-head evidence that P5P works better than plain pyridoxine for this specific use, but it is a reasonable alternative if regular B6 causes stomach upset.
The bottom line
Adding vitamin B6 to levetiracetam is one of the few "supplement plus drug" combinations with a credible behavioral target: reducing the irritability and mood changes that make people stop taking an otherwise excellent anticonvulsant. The evidence is suggestive rather than airtight, but the strategy is cheap, low-risk in the short term, and worth discussing with your prescriber if levetiracetam is working for your seizures but wrecking your mood. Stay under 100 mg/day, do it under medical guidance, and watch for any signs of sensory neuropathy.