NutriStack
GABA and Lorazepam, a caution.
Supplemental GABA may have sedative effects that could add to lorazepam's CNS depression. Although the extent of oral GABA's blood-brain barrier penetration is uncertain, the potential for additive GABAergic effects warrants caution with this combination.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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What the row says.
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At a glance
- Pair type
- Caution
- Evidence (highest tier)
- Emerging
- Source citations
- 2 sources
- Stack Score effect
- −5 to your Stack Score (per scored caution row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Caution · Emerging evidence
Caution
What is happening. Supplemental GABA may have sedative effects that could add to lorazepam's CNS depression. Although the extent of oral GABA's blood-brain barrier penetration is uncertain, the potential for additive GABAergic effects warrants caution with this combination.
Mechanism. If supplemental GABA crosses the blood-brain barrier, it would directly activate GABA receptors, adding to lorazepam's enhancement of GABA-A receptor-mediated chloride conductance. Peripheral GABAergic effects may also contribute to overall sedation.
Recommendation. Exercise caution when combining GABA supplements with lorazepam. Monitor for excessive sedation, drowsiness, or impaired coordination.
Sources (2)
- Boonstra E et al. Neurotransmitters as food supplements: the effects of GABA on brain and behavior. Front Psychol. 2015;6:1520. PMID 26500584
- Guimarães AP, Seidel H, Pires LVM et al.. GABA Supplementation, Increased Heart-Rate Variability, Emotional Response, Sleep Efficiency and Reduced Depression in Sedentary Overweight Women Undergoing Physical Exercise: Placebo-Controlled, Randomized Clinical Trial. Journal of Dietary Supplements. 2024. PMID 38321713
Stack Score
How this pair moves the number.
Effect on the composite score
If both GABA and Lorazepam are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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