Drug & supplement interaction

Lithium + Levothyroxine, Liothyronine

Levothyroxine, Liothyronine brand name: Armour Thyroid.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 13, 2026
The bottom line No known interaction

We found no known interaction between Lithium and Levothyroxine, Liothyronine in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first.

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Interaction report

Lithium and Levothyroxine, Liothyronine

We checked these two against our interaction database. Here is what we found.

No Known Interaction Found

We did not find a documented interaction between Levothyroxine, Liothyronine and Lithium in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.

If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.

Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.

Lithium safety at a glance

Lithium overall Use caution Lithium has a narrow safety margin and prescription forms require blood monitoring; supplement forms are not well studied.
Pregnancy Possibly Unsafe When lithium carbonate and lithium citrate are used orally. Lithium can cause fetal toxicity and increases the risk for cardiac and other abnormalities, includi... Read the full pregnancy detail
Breastfeeding Likely Unsafe When used orally. Lithium is secreted into breast milk and may cause adverse effects in the nursing infant. Prescription lithium may be used in circumstances wh... Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center) — the full detail is in the Special populations card below. Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Levothyroxine, Liothyronine and Lithium? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Levothyroxine, Liothyronine

Interactions in our licensed database are recorded against drug classes, not just single drug names. Levothyroxine, Liothyronine is filed under 3 classifications — including thyroid hormone, oral drugs. Lithium has documented interactions with 11 drug classes — the most serious being diuretic drugs (major), serotonergic drugs (major) and ace inhibitors (aceis) (moderate) — and none of Levothyroxine, Liothyronine’s classifications are among them.

Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.

Keep it in perspective

Lithium Does Interact With Other Medications

Lithium has 259 major, 256 moderate known drug interactions in our database — Levothyroxine, Liothyronine isn’t one of them. If you take anything else, check it against the full list below.

Major 259 Moderate 256 No known interaction 2,315 (incl. Levothyroxine, Liothyronine)
Taking anything else?

Check Another of Your Medications Against Lithium

Covers the 2,830 medications we’ve checked against Lithium. Pick one to open its full report.

What to actually watch for

What Lithium Itself Has Been Linked To

This is not an interaction — nothing below involves Levothyroxine, Liothyronine. It is the side-effect record for Lithium on its own, from the licensed Natural Medicines monograph. If something new turns up after you add Lithium, this list is the first place to look. 5 entries are worth acting on rather than waiting out — marked below.

  • A change in thyroid levels Worth acting on Additional detail

    “Orally, chronic use of lithium has been reported to cause various endocrine disorders. Case reports associate chronic lithium use with hypothyroidism, hyperthyroidism, goiter, hyperparathyroidism, and diabetes insipidus (9,15,104267,104269,104270,104271,111320). In one case report, a 68-year-old male with schizophrenia developed severe hypothyroidism resulting in myxedema coma after taking oral lithium carbonate.”

    Lithium · Natural Medicines adverse-effect record, reported in diabetes.

    6 sources cited
    1. 9. Martindale W. Martindale the Extra Pharmacopoeia. Pharmaceutical Press, 1999.
    2. 15. McEvoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.
    3. 104267. Rauf A, Gul S, Nasir M, Arif U, Oyenuga M. A Rare Case of Lithium-induced Partial Nephrogenic Diabetes Insipidus. Cureus. 2020;12(4):e7877. PubMed
    4. 104269. Hanna RM, Hasnain H, Sangalang MD, et al. Three Patients with Lithium-Associated Hyperparathyroidism: Literature Review Regarding Medical and Surgical Management. Case Rep Nephrol Dial. 2019;9(2):108-118. PubMed
    5. 104270. Rana P, Alba Aponte P, Babar G. An Adolescent Female with Bipolar Disorder Presenting with Lithium-Induced Hyperthyroidism. Case Rep Endocrinol. 2020;2020:1283464. PubMed
    6. 104271. Nwabufor PC, Omoniyi ON, Oyibo SO. A Case of Lithium-Associated Hypocalciuric Hypercalcemia. Cureus. 2020;12(9):e10606. PubMed
  • Muscle weakness Worth acting on Additional detail

    “Orally, lithium can cause vertigo, muscle weakness, lethargy, fatigue, and a dazed feeling. These adverse effects often improve with continued use. Fine tremor can occur and may persist with continued use. Chronic use of lithium can cause mild cognitive and memory impairment, particularly in the presence of dehydration or hyponatremia (9,15,97745).”

    Lithium · Natural Medicines adverse-effect record, reported in bipolar disorder.

    6 sources cited
    1. 9. Martindale W. Martindale the Extra Pharmacopoeia. Pharmaceutical Press, 1999.
    2. 15. McEvoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.
    3. 97745. Foulser P, Abbasi Y, Mathilakath A, Nilforooshan R. Do not treat the numbers: lithium toxicity. BMJ Case Rep. 2017;2017. pii: bcr-2017-220079. PubMed
    4. 105344. Benjelloun R, Motaib I, Otheman Y. Lithium-associated hypercalcemia presenting with neuropsychiatric manifestations in a patient with bipolar disorder. Case Rep Psychiatry. 2020;2020:6630838. PubMed
    5. 111316. Yang Q, Cheng X, Su Z, Sun L, Li M. Electroconvulsive therapy combined with lithium developed reversible pure anomic aphasia: a case report. BMC Psychiatry 2022;22(1):663. PubMed
    6. 111318. Ono R, Nishiguchi S, Kitagawa I. Lithium intoxication-associated mild encephalitis/encephalopathy with a reversible splenial lesion: A case report. Bipolar Disord 2022;24(5):551-552. PubMed
  • Memory problems / Dehydration / Low sodium / Hallucinations / Confusion Worth acting on Additional detail

    Recorded for Lithium in the same Natural Medicines adverse-effect record shown under Muscle weakness above.

  • Trouble swallowing Worth acting on Additional detail

    “Orally, chronic use of lithium has been reported to cause an irreversible reduction in taste and smell in a patient with bipolar disorder who took 400-1000 mg/day for 4 months. Chronic use of lithium 1200 mg/day has also been reported to cause dysphagia in a 17-year-old patient with bipolar disorder;”

    Lithium · Natural Medicines adverse-effect record, reported in bipolar disorder.

    2 sources cited
    1. 111313. Nombora O, Samico A, Venâncio Â. Lithium-Induced Dysgeusia and Hyposmia: A Case Report and a Literature Review. Clin Neuropharmacol 2023;46(1):31-33. PubMed
    2. 111328. Aydin D, Tural Hesapcioglu S, Ceylan MF. Oropharyngeal Dysphagia as a Clinical Presentation of Lithium Intoxication: A Case Report. J Am Acad Child Adolesc Psychiatry 2021;60(12):1443-1445. PubMed
  • A slow heartbeat / Blood clots Worth acting on Additional detail

    “Orally, lithium has been reported to cause bradyarrhythmia. A case of symptomatic bradycardia due to sinoatrial node dysfunction is reported in a patient with bipolar disorder who took lithium orotate 20 mg daily for 5 years, despite a serum lithium level in the therapeutic range. Deep vein thrombosis is also reported in 2 patients with bipolar disorder who experienced toxic serum levels of lithium.”

    Lithium · Natural Medicines adverse-effect record, reported in bipolar disorder.

    2 sources cited
    1. 111327. Sarangi A, Javed S, Paul T, Amor W. Lithium-Induced Sinoatrial Node Dysfunction. Cureus 2021;13(7):e16778. PubMed
    2. 111329. Sogawa R, Tobita S, Monji A, et al. Deep Vein Thrombosis after Lithium Toxicity: A Report of Two Cases and Literature Review. Case Rep Psychiatry 2021;2021:9934037. PubMed

Showing the 10 most notable of 24 recorded effects — ranked by how unusual each one is across medicines generally, with serious effects weighted up.

Everything above comes from the Natural Medicines adverse-effect record for Lithium — expand a row for the licensed statement it rests on. We haven’t matched Levothyroxine, Liothyronine to its FDA label in our system yet, so we can’t compare its own side-effect list here — the leaflet that comes with your prescription is the authoritative list for Levothyroxine, Liothyronine.

Special populations

Lithium in Pregnancy & Breastfeeding

Pregnancy Possibly Unsafe

When lithium carbonate and lithium citrate are used orally. Lithium can cause fetal toxicity and increases the risk for cardiac and other abnormalities, including neural tube and urethral defects. However, it does not seem to increase the risk for preterm birth or low birth rate. Some research suggests lithium might increase the risk for spontaneous abortion. Based on a meta-analysis of 2 population studies, taking lithium during pregnancy may increase the risk for spontaneous abortion when compared with the general population, but not when compared with patients with affective disorders not taking lithium during pregnancy. This suggests that it may be the presence of affective disorder itself, or the possible associated use of other teratogenic drugs or substances during pregnancy, which may increase the risk for spontaneous abortion. When the potential benefits to the mother and child outweigh the possible risk to the fetus, prescription lithium may be used with close monitoring by a healthcare professional. The safety of lithium supplements during pregnancy is unknown.

Lactation Likely Unsafe

When used orally. Lithium is secreted into breast milk and may cause adverse effects in the nursing infant. Prescription lithium may be used in circumstances when the potential maternal benefits outweigh the possible risk to the infant. The infant should be closely monitored for signs of lithium toxicity.

DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.© 2026 Therapeutic Research Center

From our Q&A

Questions About Lithium or Levothyroxine, Liothyronine

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Lithium or Levothyroxine, Liothyronine, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:

Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.

Everything else you take

See Every Supplement That Interacts With Levothyroxine, Liothyronine

This page covers Lithium only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Levothyroxine, Liothyronine page lists 50 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Tiratricol (major), Acetyl-l-carnitine (moderate), Alpha-lipoic Acid (moderate) and Ascophyllum Nodosum (moderate).

By severity: 2 major · 39 moderate · 9 minor.

From our pharmacist’s overview on the Levothyroxine, Liothyronine page

“For anyone taking levothyroxine or liothyronine (Armour Thyroid), this list earns real caution, not just a passing glance. Most of these 50 ingredients pull in one of two directions.”

Reviewed by 2 · Jul 18, 2026

Open the Levothyroxine, Liothyronine interaction page

One more smart check

Taking Lithium as Part of a Dietary Supplement Product? Check It for Interactions

We hold 330 real supplement products containing Lithium, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Lithium. Even though Lithium itself has no known interaction with Levothyroxine, Liothyronine, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:

How much people look this up

Where Lithium and Levothyroxine, Liothyronine Sit Against Everything Else

Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.

Supplement Lithium
Top 25%

#259 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Levothyroxine, Liothyronine
Top 5%

#62 of 2,830 medications looked up here in the last 7 days

29 days ago today

Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.

Where does our data come from?
  • Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Lithium reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Lithium and Levothyroxine, Liothyronine records this page draws on were last updated July 11, 2026.
  • What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
Data structure & sourcing designed and verified by .
Supplement

About Lithium

What is Lithium?

Lithium
  • Mood support
  • Bipolar disorder (prescription)
  • Healthy mental function
  • Irritability or stress
  • Sleep support

Lithium is a naturally occurring metal that, in prescription form (lithium carbonate or citrate), is an FDA-approved, well-proven treatment for bipolar disorder. Low-dose supplement forms like lithium orotate are sold for mood support, but there is very little reliable evidence that they work, and even small amounts of lithium can be risky for some people. Always talk to a pharmacist or doctor before taking any lithium product.

Mineral element (not a plant); various lithium salts · Capsules, tablets (lithium orotate, lithium aspartate in supplements; lithium carbonate and citrate as prescription drugs)

An interaction check asks whether these two react with each other — it does not ask whether Lithium is a good idea for someone in your situation. Here is what our Lithium record says about it on its own.

Lithium: dosing

There is no established, well-tested dose for low-dose lithium supplements, and product strengths vary widely between brands.

From our Lithium monograph — the full record covers uses, side effects and every documented interaction.

Read the full Lithium monograph & all interactions
Medication

About Levothyroxine, Liothyronine

Most-Reported Side Effects for Levothyroxine, Liothyronine

From FAERS, the FDA’s public side-effect reporting system (15 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Fatigue 4 reports
Asthenia 3 reports
Dizziness 3 reports
Arthralgia 2 reports
Disorientation 2 reports
Keep checking

Other Drugs & Lithium

Browse every other medication we’ve checked against Lithium — both the ones with a known interaction and the ones without. Select any drug for the full detail.

259Major
256Moderate
0Minor
2,314No known interaction
259 Major 256 Moderate 2,314 No interaction
Major

259 interactions

Showing 60 of 259 major interactions — see all 259 on the Lithium page.

Moderate

256 interactions

Showing 60 of 256 moderate interactions — see all 256 on the Lithium page.

No interaction 2,314 drugs checked — show the list

We also checked Lithium against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,314 medications checked with no known interaction — see the full Lithium list.

See the full Lithium interactions page
See every supplement checked against Levothyroxine, Liothyronine, ranked by severity
Evidence & sources

Lithium References

The 26 references that drive our Lithium monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

  1. Martindale W. Martindale the Extra Pharmacopoeia. Pharmaceutical Press, 1999.
  2. McEvoy GK, ed. AHFS Drug Information. Bethesda, MD: American Society of Health-System Pharmacists, 1998.
  3. Perlis RH, Sachs GS, Lafer B, et al. Effect of abrupt change from standard to low serum levels of lithium: a reanalysis of double-blind lithium maintenance data. Am J Psychiatry 2002;159:1155-9.. PubMed
  4. Pinelli JM, Symington AJ, Cunningham KA, Paes BA. Case report and review of the perinatal implications of maternal lithium use. Am J Obstet Gynecol 2002;187:245-9.. PubMed
  5. Sawagashira R, Sasagawa Y, Matsukura M, Takamaru Y. Case of myxedema coma induced by lithium carbonate in a patient with schizophrenia. Psychiatry Clin Neurosci. 2018;72(2):131. PubMed
  6. Foulser P, Abbasi Y, Mathilakath A, Nilforooshan R. Do not treat the numbers: lithium toxicity. BMJ Case Rep. 2017;2017. pii: bcr-2017-220079. PubMed
  7. https://www.accessdata.fda.gov/drugsatfda_docs/label/2011/017812s028,018421s027lbl.pdf. Accessed Nov. 21, 2018
  8. Fornaro M, Maritan E, Ferranti R, et al. Lithium Exposure During Pregnancy and the Postpartum Period: A Systematic Review and Meta-Analysis of Safety and Efficacy Outcomes. Am J Psychiatry. 2020;177(1):76-92. DOI
  9. Rauf A, Gul S, Nasir M, Arif U, Oyenuga M. A Rare Case of Lithium-induced Partial Nephrogenic Diabetes Insipidus. Cureus. 2020;12(4):e7877. PubMed
  10. Hanna RM, Hasnain H, Sangalang MD, et al. Three Patients with Lithium-Associated Hyperparathyroidism: Literature Review Regarding Medical and Surgical Management. Case Rep Nephrol Dial. 2019;9(2):108-118. PubMed
  11. Rana P, Alba Aponte P, Babar G. An Adolescent Female with Bipolar Disorder Presenting with Lithium-Induced Hyperthyroidism. Case Rep Endocrinol. 2020;2020:1283464. PubMed
  12. Nwabufor PC, Omoniyi ON, Oyibo SO. A Case of Lithium-Associated Hypocalciuric Hypercalcemia. Cureus. 2020;12(9):e10606. PubMed
  13. Landa E, Wagner S, Makkar A, Liu A, Jung D. An atypical presentation of serotonin syndrome. Cureus. 2021;13(2):e13377. PubMed
  14. Benjelloun R, Motaib I, Otheman Y. Lithium-associated hypercalcemia presenting with neuropsychiatric manifestations in a patient with bipolar disorder. Case Rep Psychiatry. 2020;2020:6630838. PubMed
  15. Nombora O, Samico A, Venâncio Â. Lithium-Induced Dysgeusia and Hyposmia: A Case Report and a Literature Review. Clin Neuropharmacol 2023;46(1):31-33. PubMed

Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

Pharmacist Counseling Corner

Taking Lithium and Levothyroxine, Liothyronine Together: Common Questions

Is it safe to take Lithium with Levothyroxine, Liothyronine?
We do not list a known interaction between Lithium and Levothyroxine, Liothyronine. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
How was the Lithium and Levothyroxine, Liothyronine combination checked?
Interactions in our licensed database are recorded against drug classes. Levothyroxine, Liothyronine is filed under 3 classifications, and Lithium has documented interactions with 11 drug classes — none of Levothyroxine, Liothyronine's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.
Does Lithium interact with any other medications?
Yes. Lithium has 515 documented drug interactions in our database — Levothyroxine, Liothyronine is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.
Does Levothyroxine, Liothyronine interact with any supplements?
Yes. Levothyroxine, Liothyronine has documented interactions with 50 supplements in our database — Lithium is not one of them. The Levothyroxine, Liothyronine interaction page linked on this page lists every one, ranked by severity.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Where next

Keep Exploring

Lithium monograph Uses, safety profile, and every drug interaction in one place Levothyroxine, Liothyronine supplement interactions Every supplement checked against Levothyroxine, Liothyronine, ranked by severity Supplement interaction checker Check any supplement or product against your medications Browse medications A–Z Every drug we’ve checked against herbs & supplements References The 26 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Levothyroxine, Liothyronine and Lithium?

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This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.