Medications That May Deplete INOSITOL
See which medications carry a reported association, how strong the evidence is, and what to discuss with your pharmacist.
Inositol is a sugar alcohol made naturally in the body and found in many foods, and it is sold as a supplement (often myo-inositol) mainly for PCOS, mood, and metabolic concerns. The strongest evidence is for PCOS-related symptoms, while support for other uses is more limited. It is generally well tolerated, but talk with your pharmacist or doctor before starting it, especially if you are pregnant or have a health condition.
Commonly used for: Polycystic ovary syndrome (PCOS), Anxiety and panic, Depression and mood, Insulin and blood sugar support, Fertility support, Metabolic syndrome.
HelloPharmacist pharmacist-reviewed education. The medication records below are licensed clinical data, shown as published.
Deep dive: Inositol — uses, safety & drug interactions
Medications associated with INOSITOL depletion
Each record is shown as published in our licensed clinical database. Open a medication for its full nutrient report.
Carbamazepine
Insignificant DepletionBrand names include Tegretol, Tegretol XR, Equetro
Carbamazepine reduces inositol levels in the brain, probably by inhibiting an enzyme involved in inositol synthesis. Levels of inositol in the systemic circulation are determined primarily by dietary intake, and are unlikely to be affected significantly by carbamazepine. The effect of carbamazepine on brain inositol levels might contribute to its therapeutic effect in bipolar disorder. The effect of inositol supplements on the efficacy of carbamazepine is unknown.
Inositol is a naturally occurring compound that plays a role in how brain cells send signals to each other. Carbamazepine appears to interfere with an enzyme the brain uses to produce inositol locally, which can nudge levels down in the brain itself. Here is the reassuring part: your body gets most of its inositol from food, and that dietary supply is not meaningfully affected by the medication. For the vast majority of people taking carbamazepine, this is not something that requires action, but feel free to bring it up with your pharmacist or doctor if you have questions.
References (3)
- Williams RS, Cheng L, Mudge AW, Harwood AJ. A common mechanism of action for three mood-stabilizing drugs. Nature 2002;417:292-5. PubMed
- Harwood AJ. Lithium and bipolar mood disorder: the inositol-depletion hypothesis revisited. Mol Psychiatry 2005;10:117-26. PubMed
- Shaltiel G, Shamir A, Shapiro J, et al. Valproate decreases inositol biosynthesis. Biol Psychiatry 2004;56:868-74. PubMed
Lithium Carbonate (prescription drug)
Insignificant DepletionBrand names include Eskalith, Lithium Carbonate
Lithium reduces inositol levels in the brain by inhibiting the inositol monophosphatase enzyme, which is involved in synthesis of inositol. Levels of inositol in the systemic circulation are determined primarily by dietary intake, and do not seem to be significantly affected by lithium. The effect of lithium on brain inositol levels might contribute to its therapeutic effect in bipolar disorder. Animal research suggests that inositol supplementation may reduce the therapeutic effects of lithium, whereas dietary inositol restriction may augment the effects of lithium. It has also been suggested that reduction of tissue inositol levels might contribute to adverse effects of lithium; a small study reported benefit with inositol supplements in lithium-induced psoriasis.
Inositol is a naturally occurring compound that plays a role in cell signaling throughout the body, including in the brain. Lithium appears to block an enzyme the brain uses to recycle inositol, which can modestly lower inositol levels in brain tissue. Interestingly, some researchers think this effect may actually be part of how lithium helps with bipolar disorder. The good news is that inositol levels in the bloodstream are mainly controlled by what you eat and do not seem to be meaningfully affected, so for most people taking lithium, this is not something that requires attention. If you have questions or notice any unusual symptoms, it is always fine to bring them up with your pharmacist or doctor.
References (6)
- Shaldubina A, Stahl Z, Furszpan M, et al. Inositol deficiency diet and lithium effects. Bipolar Disord 2006;8:152-9. PubMed
- Agranoff BW, Fisher SK. Inositol, lithium, and the brain. Psychopharmacol Bull 2001;35:5-18. DOI
- Williams RS, Cheng L, Mudge AW, Harwood AJ. A common mechanism of action for three mood-stabilizing drugs. Nature 2002;417:292-5. PubMed
- Harwood AJ. Lithium and bipolar mood disorder: the inositol-depletion hypothesis revisited. Mol Psychiatry 2005;10:117-26. PubMed
- Allan SJ, Kavanagh GM, Herd RM, Savin JA. The effect of inositol supplements on the psoriasis of patients taking lithium: a randomized, placebo-controlled trial. Br J Dermatol 2004;150:966-9. PubMed
- Shaltiel G, Shamir A, Shapiro J, et al. Valproate decreases inositol biosynthesis. Biol Psychiatry 2004;56:868-74. PubMed
Full nutrient report for Lithium Carbonate (prescription drug) →
Sodium valproate
Insignificant DepletionBrand names include Epilim
Valproic acid reduces inositol levels in the brain by inhibiting the inositol phosphate synthase enzyme, which is involved in synthesis of inositol. Levels of inositol in the systemic circulation are determined primarily by dietary intake, and are unlikely to be affected significantly by valproic acid. The effect of valproic acid on brain inositol levels might contribute to its therapeutic effect in bipolar disorder. The effect of inositol supplements on the efficacy of valproic acid is unknown.
Inositol is a naturally occurring compound your cells use for signaling, and it plays a role in how the brain regulates mood. Sodium valproate appears to interfere with an enzyme the brain uses to produce inositol locally, which can modestly lower inositol levels in brain tissue. Importantly, the inositol circulating in your bloodstream comes mainly from food and is not meaningfully affected. This is rated as an insignificant depletion, so most people taking valproate do not need to worry about supplementing it, though if you have questions your pharmacist or doctor is the right person to ask.
References (3)
- Williams RS, Cheng L, Mudge AW, Harwood AJ. A common mechanism of action for three mood-stabilizing drugs. Nature 2002;417:292-5. PubMed
- Harwood AJ. Lithium and bipolar mood disorder: the inositol-depletion hypothesis revisited. Mol Psychiatry 2005;10:117-26. PubMed
- Shaltiel G, Shamir A, Shapiro J, et al. Valproate decreases inositol biosynthesis. Biol Psychiatry 2004;56:868-74. PubMed
Valproic Acid
Insignificant DepletionBrand names include Depakene, Depacon, Valproate
Valproic acid reduces inositol levels in the brain by inhibiting the inositol phosphate synthase enzyme, which is involved in synthesis of inositol. Levels of inositol in the systemic circulation are determined primarily by dietary intake, and are unlikely to be affected significantly by valproic acid. The effect of valproic acid on brain inositol levels might contribute to its therapeutic effect in bipolar disorder. The effect of inositol supplements on the efficacy of valproic acid is unknown.
Inositol is a naturally occurring compound your cells use for signaling, and it plays a role in how the brain regulates mood. Valproic acid appears to slow down an enzyme the brain uses to make its own inositol, which can modestly reduce inositol levels inside brain tissue. Interestingly, some researchers think this brain effect may actually be part of how the medication helps with bipolar disorder. Because your body gets most of its inositol from food and blood levels are generally not affected much, this is considered an insignificant depletion for most people, so no action is typically needed. That said, if you have any questions about inositol or supplements, your pharmacist or doctor is a good place to start.
References (3)
- Williams RS, Cheng L, Mudge AW, Harwood AJ. A common mechanism of action for three mood-stabilizing drugs. Nature 2002;417:292-5. PubMed
- Harwood AJ. Lithium and bipolar mood disorder: the inositol-depletion hypothesis revisited. Mol Psychiatry 2005;10:117-26. PubMed
- Shaltiel G, Shamir A, Shapiro J, et al. Valproate decreases inositol biosynthesis. Biol Psychiatry 2004;56:868-74. PubMed
This tool is educational and is not a substitute for professional medical advice. An association is not a diagnosis and does not mean a deficiency will occur. Always talk to your pharmacist or healthcare provider before starting, stopping, or changing any medication or supplement.
Disclaimer: This checker finds which nutrients might be depleted by prescription or over-the-counter medications. Each nutrient depletion issue is rated based on clinical significance. Use your own professional judgment prior to making clinical decisions.© 2026 Therapeutic Research Center Licensed records refresh weekly · last updated July 3, 2026.
What drug-induced nutrient depletion means
Some medications can, over time, lower the levels of certain vitamins, minerals, or other nutrients — through reduced absorption, increased loss, or changes in how the body uses them.
Association is not deficiency
An entry here means a depletion has been reported or studied — not that it happens to everyone, or that you are deficient. Dose, duration, diet, and your own health all matter.
Evidence varies by pair
Some drug–nutrient links (like metformin and vitamin B12) are well studied; others rest on limited or preliminary research. Each entry shows the evidence rating from our licensed clinical database.
When to ask about labs
If you take an associated medication long-term, ask your healthcare provider whether monitoring is appropriate for you. Not everyone needs testing — your provider can weigh your dose, duration, and symptoms.
Don't self-supplement blindly
Supplements are not risk-free: some can interact with medications, and some (like potassium or magnesium) can be risky with kidney disease. Talk to your pharmacist before adding anything.
Never stop a medication over this
These medications are prescribed for good reasons, and the benefit usually far outweighs a manageable nutrient consideration. Any change belongs in a conversation with your prescriber.
Food first, usually
For many nutrients, a varied diet covers the gap. Each entry lists common food sources; a supplement is a decision to make with your pharmacist or provider, not a default.
INOSITOL & medications: FAQs
Which medications can lower INOSITOL?
I take one of these medications — am I deficient in INOSITOL?
Should I start a INOSITOL supplement?
Where does this information come from?
Other commonly implicated nutrients
Wondering about your INOSITOL levels?
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Sources & How We Checked
Medication associations with INOSITOL are evidence-graded and sourced from the Natural Medicines database, and are displayed as published with their citations.
- Natural Medicines (Therapeutic Research Center) — Evidence-graded clinical reference for drug-induced nutrient depletions, supplements, and interactions — the basis for this page.
- MedlinePlus, U.S. National Library of Medicine — NIH consumer drug information, used for medication overviews across the site.
Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.