Can You Abuse Lithium and What Happens If You Do?

Lithium is not a drug people abuse for a high, because it does not produce one. In healthy volunteers, lithium tends to flatten mood or cause mild dysphoria rather than euphoria, which makes it essentially useless as a recreational substance. But “abuse” in the broader sense of taking too much, whether deliberately or accidentally, is a real and dangerous phenomenon. Lithium has one of the narrowest margins between a therapeutic dose and a toxic one of any psychiatric medication, and crossing that line can damage the kidneys, thyroid, and brain, sometimes permanently.

Why Lithium Has No Recreational Appeal

The reason lithium never shows up on lists of commonly abused drugs is straightforward: it makes most people feel worse, not better. A study of healthy volunteers given lithium carbonate found that subjects scored lower on mood scales while taking it, and this was attributed to lithium-induced dysphoric mood. Interestingly, the responses varied wildly between individuals, with some volunteers even experiencing the opposite effect, but the general trend was toward feeling duller rather than elevated.¹ Another study of healthy subjects found no initial sedative-like effect from lithium at all, suggesting the drug does not produce the kind of drowsy relaxation that sedative-seekers look for either.²

Researchers who studied lithium’s effects on impulsivity and emotional processing in healthy volunteers went so far as to exclude subjective mood measures from their analysis, noting that they anticipated lithium would have negligible effects on self-reported mood in people without mood disorders.³ In short, lithium works by stabilizing mood in people whose moods are pathologically unstable. For everyone else, it just feels like a damp blanket. There is no rush, no euphoria, and no reinforcement loop that would make someone want to take more.

How Lithium Poisoning Actually Happens

Even though lithium is not abused recreationally, lithium poisoning is far from rare. The scenarios fall into three recognized patterns. Acute poisoning happens when someone who is not already taking lithium ingests a large amount at once, often in a suicide attempt. Acute-on-chronic poisoning occurs when someone already on a stable lithium regimen takes an extra-large dose, again usually deliberately. And chronic poisoning, the most common type, happens when lithium gradually accumulates in the body because intake exceeds the kidneys’ ability to clear it.⁴

Chronic poisoning is especially insidious because it often happens without anyone meaning for it to. A patient’s kidney function quietly declines, or they become dehydrated during a bout of gastroenteritis, or a new medication interferes with lithium clearance, and their blood levels creep up over days or weeks. A retrospective analysis of 136 patients with high lithium levels found that about two-thirds of cases were chronic, meaning the lithium dose itself was stable but something else in the patient’s body had changed.⁵ Deliberate intoxications, when they do occur, tend to cluster in the first three years of lithium treatment and in patients who have previously attempted suicide.⁶

The distinction between these patterns matters medically. In acute poisoning, the blood level may spike high but the lithium has not yet had time to saturate the brain and other tissues. In chronic poisoning, even a modestly elevated blood level can cause severe symptoms because lithium has been accumulating inside cells for weeks. One study measuring lithium concentrations in both blood plasma and red blood cells confirmed this: chronic-on-chronic cases showed preferential accumulation of lithium inside red blood cells, indicating the ion had been building up intracellularly over time.⁷

What Lithium Toxicity Feels Like

Lithium is absorbed completely from the gut, is not broken down by the body at all, and over 95% of it leaves through the kidneys unchanged.⁸ This makes the kidneys the single bottleneck for getting rid of excess lithium, and it explains why anything that slows kidney function can tip a person from therapeutic levels into toxicity.

Mild toxicity brings symptoms that are easy to mistake for a bad day: weakness, worsening hand tremor, mild unsteadiness when walking, trouble concentrating, and diarrhea. As levels climb, the picture gets unmistakable: vomiting, a coarse whole-body tremor, slurred speech, confusion, and deepening drowsiness.⁹ At the severe end, people may develop seizures, coma, and cardiovascular instability. The progression can unfold over hours in an acute ingestion or creep in over days in chronic toxicity, which is part of what makes the chronic version so dangerous. Patients and families may not realize anything is wrong until the person is already confused and unsteady.

Medications and Conditions That Tip the Balance

One of the most common ways lithium levels drift upward has nothing to do with the patient taking extra pills. Over 40% of patients in one retrospective study were taking at least one medication that is relatively contraindicated alongside lithium.⁵ The biggest culprits are drugs that alter how the kidneys handle sodium and water.

Common anti-inflammatory painkillers like ibuprofen and naproxen reduce blood flow to the kidney’s filtration units, which in turn slows lithium excretion.¹⁰ Blood pressure medications in the ACE inhibitor and angiotensin receptor blocker classes can have a similar effect, as can thiazide diuretics, which increase sodium reabsorption and drag lithium along with it.¹¹ What makes these interactions treacherous is that the offending medications are extremely common. A person who has been stable on lithium for years can develop high blood pressure, start a new medication, and slide into toxicity within a week or two.

Dehydration from any cause, whether illness, hot weather, heavy exercise, or simply not drinking enough, has the same effect by concentrating lithium in less fluid and reducing kidney flow. Low-sodium diets can also raise lithium levels because the kidneys reabsorb lithium more aggressively when sodium is scarce. The practical takeaway for anyone on lithium: any change in fluid intake, salt intake, or kidney-related medication is a potential trigger and warrants checking blood levels sooner rather than later.

What Chronic Use Does to the Kidneys and Thyroid

Beyond acute toxicity episodes, lithium carries long-term risks to several organs. The kidneys bear the heaviest burden. A large retrospective cohort study found that having lithium in the blood was associated with roughly double the risk of developing stage 3 chronic kidney disease compared to people not on lithium, even after adjusting for age, sex, and diabetes.¹² A more recent cohort study of over 6,600 patients with bipolar disorder confirmed the association, though it noted that the absolute number of severe kidney outcomes was low, with chronic kidney disease developing in about 0.6% of lithium users in that sample.¹³

The most common kidney side effect is a condition where the kidneys lose their ability to concentrate urine, leading to excessive thirst and frequent urination. This is the most frequently seen renal side effect of lithium therapy, and in some cases it persists even after the drug is stopped, especially in people who used lithium for many years.¹⁴

The thyroid is the other major target. The same Lancet cohort study found that lithium users had more than twice the risk of developing hypothyroidism.¹² A long-term follow-up study added nuance: women over 60 were more affected than younger women, and people with a family history of thyroid problems developed hypothyroidism much faster, on average within about four years of starting lithium versus nearly nine years for those without a family history.¹⁵ Lithium also nudges calcium levels upward over time, which can affect the parathyroid glands.¹³

Irreversible Brain Damage From Severe Toxicity

The most feared outcome of lithium poisoning is a condition sometimes called SILENT, an acronym standing for the syndrome of irreversible lithium-effectuated neurotoxicity. It describes lasting neurological damage that persists long after lithium has been cleared from the body. The cerebellum, the brain region responsible for coordination and balance, is especially vulnerable. People who survive severe lithium toxicity may be left with permanent unsteadiness, tremor, slurred speech, and cognitive impairment.¹⁶

The mechanism is not fully understood, but researchers have proposed that lithium may disrupt calcium regulation inside cerebellar cells and cause demyelination, the stripping away of insulation from nerve fibers, across multiple brain regions.¹⁷ Dehydration and the kidney-related fluid imbalances that often accompany severe toxicity may compound the damage. Older age, reduced kidney function, and long duration of lithium use all raise the risk. SILENT is rare, but it is a genuine possibility any time lithium levels climb high enough to cause confusion or decreased consciousness, which is why prompt treatment of lithium poisoning matters so much.

How Severe Poisoning Is Treated

For mild toxicity, the first step is usually to stop lithium, restore hydration with intravenous fluids, and wait for the kidneys to clear the drug. But when levels are dangerously high or the patient is already showing serious symptoms, waiting is not safe. A systematic review by an international expert workgroup laid out clear recommendations: extracorporeal treatment, essentially using a dialysis machine to filter lithium from the blood, is recommended when kidney function is impaired and the lithium level exceeds a certain threshold, or whenever the patient has a decreased level of consciousness, seizures, or life-threatening heart rhythm problems regardless of the blood level. Hemodialysis is the preferred technique, and it should continue until the patient improves clinically or lithium drops to safe levels.¹⁸

One complication of dialysis for lithium is the rebound effect. Because lithium distributes slowly into tissues, dialysis can rapidly clear it from the blood while a reservoir remains inside cells. After dialysis stops, lithium leaks back out of tissues into the blood, and levels can spike again. This is why repeated or prolonged dialysis sessions are sometimes necessary, and why the workgroup recommended a minimum of six hours of treatment when lithium levels cannot be checked quickly.¹⁸

Older Adults Face Outsized Risk

Lithium toxicity is not an equal-opportunity threat. Older adults are disproportionately vulnerable because of age-related kidney decline, higher rates of medications that interact with lithium, and more medical conditions that can destabilize fluid and electrolyte balance. A systematic review of case reports of lithium toxicity in older adults found a mean age of about 71, with three-quarters having medical comorbidities and nearly two-thirds taking multiple medications. The average lithium dose in these cases was well within the normal prescribing range, and yet the average toxic blood level was quite high, suggesting that small changes in kidney function or hydration can cause dramatic accumulation.¹⁹ Neurotoxicity was the most common presentation, followed by kidney and cardiovascular problems. For older adults on lithium, more frequent blood monitoring and conservative dosing are standard practice, though the evidence from case reports suggests that even careful monitoring does not always prevent toxicity when intercurrent illness strikes.

Over-the-Counter Lithium Supplements

Prescription lithium (typically lithium carbonate or lithium citrate) is a controlled medication requiring blood-level monitoring. But lithium orotate, a salt of lithium bound to orotic acid, is sold over the counter in many countries as a dietary supplement. The doses are dramatically lower: supplement labels typically recommend amounts that deliver roughly 5 to 20 milligrams of elemental lithium, compared to the hundreds of milligrams in prescription lithium. A toxicological evaluation noted that prescription lithium therapeutic doses contain 5.5 to 67 times more lithium than what is typically recommended in supplement form, and that decades of consumer use have produced few reported adverse events.²⁰

Animal research has suggested that lithium orotate may actually behave differently in the body than lithium carbonate. In a mouse study, lithium orotate blocked amphetamine-induced hyperactivity at a fraction of the dose needed for lithium carbonate, and it did so without the kidney-stress markers and thyroid changes seen with the conventional form. The researchers attributed this to different uptake pathways: lithium orotate appears to enter cells through an organic anion transporter rather than through the passive diffusion that governs lithium carbonate.²¹ These findings are intriguing, but they come from mice, not humans. The supplement industry has outpaced the clinical research, and no large human trials have established safe upper limits or confirmed therapeutic benefits for lithium orotate supplements.

The risk of misuse here is real but different from prescription lithium. Someone could theoretically take large quantities of an unmonitored supplement, especially if they are self-treating mood symptoms without medical guidance. Because supplements are not subject to blood-level monitoring, there would be no early warning that levels were climbing.

Lithium During Pregnancy

The question of lithium misuse takes on special weight during pregnancy. Lithium crosses the placenta, and first-trimester exposure has been associated with a higher risk of congenital heart defects in the baby, including a rare malformation called Ebstein’s anomaly. A large registry-based study confirmed this link but noted that the size of the risk was smaller than earlier estimates had suggested.²² A meta-analysis estimated that the odds of any congenital anomaly were roughly 80% higher with lithium exposure, and for cardiac anomalies specifically the odds were similarly elevated, though the absolute risk remained relatively low.²³

This creates a genuine dilemma. Stopping lithium during pregnancy increases the risk of mood episodes, which carry their own dangers for both mother and baby. Taking lithium carries a real but modest increase in birth defect risk. The decision is not about misuse in the traditional sense but about carefully weighing competing harms, ideally with close medical supervision and more frequent blood-level checks throughout pregnancy.

Trace Lithium in Drinking Water

In a curious footnote to the whole lithium story, naturally occurring lithium in public water supplies has become a topic of serious research. Lithium is a naturally occurring element, and its concentration in tap water varies widely by geography. A systematic review and meta-analysis of ecological studies found an inverse association between lithium levels in drinking water and suicide rates at the population level, supporting the hypothesis that even trace amounts of lithium may have mood-stabilizing effects.²⁴ The concentrations involved are orders of magnitude below anything that would cause toxicity, typically measured in micrograms per liter rather than the milligrams used therapeutically.

The relationship is not straightforward. One study found that higher lithium levels in drinking water were associated with higher rates of mood disorders in those same municipalities, but that the protective effect on suicide was concentrated in areas that had both high lithium levels and high rates of affective illness.²⁵ Another study confirmed the general inverse relationship between water lithium and suicide but acknowledged that ecological studies like these are inherently limited because they look at populations, not individuals.²⁶ Nobody is going to get lithium toxicity from their tap water. But the research is a reminder that lithium is not just a pharmaceutical product; it is an element woven into the environment, and its effects on mood may operate across a much wider range of exposures than we typically think about.