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Lithium Toxicity

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In one line

·Lithium's safe window is narrow (0.6–1.2 mEq/L), and anything that drops your body's water or raises sodium—dehydration, diuretics, NSAIDs, kidney trouble—can push lithium into the danger zone fast.

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Normal physiology

·Lithium is a positively charged metal ion (like sodium or potassium) that your body treats almost like salt. Your kidneys filter it from your blood into urine and flush it out. A healthy kidney keeps lithium blood levels steady by balancing how much it reabsorbs (takes back) and how much it throws away.

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What goes wrong

·Lithium toxicity happens when lithium builds up in your blood faster than your kidneys can clear it. The three big triggers: (1) losing too much water (dehydration from heat, exercise, vomiting, diarrhea); (2) starting a medicine that makes your kidneys hold on to lithium (diuretics like hydrochlorothiazide or furosemide, pain pills like ibuprofen or naproxen, ACE inhibitors for blood pressure); (3) your kidneys getting weaker (from age, diabetes, or years of lithium itself). When lithium floods into brain cells, it jams the brakes on nerve signaling so hard that neurons misfire—causing shaking, confusion, muscle twitches, seizures, and coma. In the heart, too much lithium disrupts the electrical rhythm. In the kidneys, it can punch holes in the system that concentrates urine, leaving you peeing gallons of dilute urine (nephrogenic diabetes insipidus) and making dehydration even worse—a vicious circle.

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Hallmark signs

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Red flags · escalate now

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Workup

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Treatment

·Stop lithium immediately
·Start intravenous normal saline (0.9% NaCl) to restore volume and sodium
·Hemodialysis if lithium level ≥ 2.5 mEq/L OR severe symptoms (seizures, coma, confusion, arrhythmias) OR acute kidney injury
·Stop any medications that raise lithium levels: thiazide diuretics (hydrochlorothiazide), NSAIDs (ibuprofen, naproxen, indomethacin), ACE inhibitors (lisinopril, enalapril), and ARBs (losartan, valsartan)
·Monitor lithium level every 4 to 6 hours until it falls below 1.0 mEq/L and symptoms resolve
·Correct electrolyte imbalances (sodium, potassium, calcium) and support the kidneys with fluids and close urine output tracking
·Address the cause: dehydration, infection, medication changes, or missed doses. Provide education, stable housing, mental health support, and regular follow-up before restarting lithium at a lower dose.

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NCLEX trap

·Shaky hands on lithium mean toxicity is already happening. Stop the lithium immediately and check the blood level. Giving more lithium will poison the brain and kidneys even more.
·Lithium toxicity is an emergency. The person needs to go to the hospital right now for IV fluids, blood work, and a lithium level check. Home care is dangerous because toxicity can cause seizures or coma.
·Diuretics make dehydration worse and push lithium levels even higher. Give IV normal saline (salt water) instead. If the level is very high (above 4.0 mEq/L) or the person has seizures or kidney failure, use hemodialysis (a machine that cleans the blood) to remove lithium.
·Even mildly high lithium levels need hospital care, IV fluids, and close monitoring. Brain and kidney damage can happen fast once symptoms start, even if the level seems 'just a little high.'
·When tremor, confusion, and stumbling happen together on lithium, think lithium toxicity first. Check the level before you change any medicines. Toxicity can look like mental illness, but it's a poisoning emergency.
·Lithium toxicity hides in weak kidneys and thyroid disease. Check both every time because they change how the body handles lithium. Even young, healthy people can have hidden kidney or thyroid problems that make toxicity more likely.

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