Lithium tablets are taken by mouth for the long-term treatment and prevention of mood episodes in bipolar disorder. As a mood stabiliser, lithium helps reduce the recurrence of mania and depression by altering signalling within the central nervous system.
Its benefit depends on an individually agreed schedule and regular blood-level monitoring. [1]
Lithium is an established psychiatric medication and one of the principal mood stabilisers used in bipolar disorder.
The tablet form of Lithium is intended for oral use as part of a monitored treatment plan.
Lithium dosage is individualised. A prescriber usually starts with a planned dose, arranges a blood test after steady exposure has been reached, and adjusts only when the result and the person’s symptoms support a change.
Lithium plasma levels are usually measured around 12 hours after the previous dose. A blood sample taken too early or too late may be difficult to interpret, even when the person has taken every tablet correctly.
For Lithium tablets, how much to use and how often depends on the purpose of use and is agreed with a doctor or pharmacist. Changes are normally made step by step, followed by a timed blood test.
| Plasma lithium level | Typical interpretation | Clinical response |
|---|---|---|
| 0.4–1.0 mmol/L | Common maintenance range, individualised | Continue or adjust according to symptoms and tolerability |
| 0.8–1.0 mmol/L | Often used where stronger relapse prevention is needed | Closer monitoring for adverse effects may be needed |
| 1.5 mmol/L or above | Possible toxicity | Requires urgent clinical assessment |
The target concentration can differ between acute treatment, maintenance, older age, reduced kidney function, and prior response. A single result never replaces clinical judgement.
Lithium used in psychiatric care is supplied as a lithium salt rather than as elemental metal. The salt allows lithium ions to dissolve, be absorbed through the digestive system, circulate in the bloodstream, and enter cells.
Lithium carbonate is the most widely used oral psychiatric formulation. Lithium citrate is another clinically used salt in some settings. The tablet form of Lithium is intended for oral use as part of a monitored treatment plan.
| Lithium compound | Formula or form | Pharmacological relevance |
|---|---|---|
| Lithium carbonate | Li₂CO₃ | Common oral salt used for bipolar disorder maintenance |
| Lithium citrate | Oral lithium salt | Alternative formulation, often used where a liquid preparation is needed |
| Lithium hydroxide | LiOH | A chemical lithium compound, not a standard oral treatment for bipolar disorder |
Lithium carbonate is valued in psychiatry because its pharmacokinetics are well characterised. Blood concentrations can be measured, allowing prescribers to adjust treatment according to response, kidney function, age, adverse effects, and interacting medicines.
Modified-release lithium carbonate preparations release the medicine more slowly than immediate-release products. A person should not switch between immediate-release and long-release formulations without a prescriber-led plan, because the timing of peak blood concentrations may change.
The clinical effect comes from the lithium ion. Different lithium salts contain different proportions of elemental lithium, so milligram amounts from one salt cannot be casually substituted for another.
This detail causes a common error when people move between products or formulations. The relevant question is not whether two tablets carry the same number of milligrams, but whether they provide an equivalent lithium exposure and have the same release profile.
Lithium has several effects inside nerve cells. It influences intracellular signalling pathways, affects second messengers such as inositol-related systems, and modifies the activity of neurotransmitter networks involved in mood regulation.
Its mechanism is broader than simply increasing or decreasing one brain chemical. This helps explain why lithium is useful for cyclical mood illness but requires careful monitoring rather than self-adjustment.
Dopamine is involved in motivation, reward, activity, and the heightened drive seen during mania. Lithium can moderate dopamine-related signalling, while also influencing glutamate and serotonin pathways.
Lithium is used most often for maintenance treatment after an acute episode has settled, aiming to lower the chance of future manic, hypomanic, depressive, or mixed episodes.
Prophylaxis means prevention. Lithium is prescribed to prevent repeated mood episodes in bipolar I disorder and, in selected cases, bipolar II disorder.
It may be used:
Lithium is not a quick solution for a difficult day. It is a maintenance medicine with a narrow therapeutic range, meaning the helpful and harmful blood concentrations are relatively close together.
Several avoidable habits can destabilise lithium treatment:
A missed dose should not be doubled. If it is close to the time of the next planned dose, the missed dose is usually skipped and the normal schedule resumed.
Lithium is not for you if you have severe kidney impairment, untreated low sodium levels, significant dehydration, or a known allergy to a lithium-containing medicine. It may also be unsuitable where regular blood testing cannot be maintained.
Extra assessment is needed for people with thyroid disease, heart rhythm disorders, psoriasis, diabetes insipidus, or a history of recurrent dehydration. Pregnancy planning requires specialist review because lithium crosses the placenta and treatment decisions need to balance fetal risks against the serious risks of bipolar relapse.
Medicines that can raise lithium levels include:
Do not start an over-the-counter anti-inflammatory painkiller for several days without checking its compatibility with lithium. Paracetamol is often considered instead for simple pain relief, though the appropriate choice still depends on the individual medical situation.
During vomiting, diarrhoea, fever, or marked dehydration, seek same-day advice from the team managing your lithium before taking the next dose. These illnesses can raise lithium concentrations quickly.
Fine hand tremor, increased thirst, passing urine more often, mild nausea, loose stools, and a feeling of slowed thinking can occur when lithium is started or increased. Some effects lessen after the body adjusts, while persistent symptoms can indicate that the level or schedule needs review.
Longer-term treatment can affect thyroid activity and kidney function. Weight gain, acne-like skin changes, and ankle swelling may also occur in some people.
Symptoms that may indicate lithium toxicity include worsening coarse tremor, unsteady walking, slurred speech, confusion, severe drowsiness, persistent vomiting, or severe diarrhoea. These symptoms require urgent medical assessment.
One practical detail matters: a fine tremor is different from a coarse, jerky tremor with poor coordination. The latter is more concerning, especially if it appears with sickness or confusion.
Lithium is often compared with anticonvulsant mood stabilisers and antipsychotics. The best option depends on the pattern of bipolar disorder, previous episodes, kidney and thyroid health, pregnancy plans, and how a person has responded to treatment before.
| Treatment approach | Main role | Key limitation |
|---|---|---|
| Lithium | Long-term relapse prevention and suicide-risk reduction | Requires blood monitoring and can affect kidneys or thyroid |
| Valproate-based mood stabilisation | Often used for acute mania and maintenance | Not suitable in pregnancy and requires liver-related monitoring |
| Antipsychotic-based treatment | Can control acute mania quickly and support maintenance | May cause metabolic effects, sedation, or movement-related adverse effects |
Lithium is often favoured when prevention of recurrent classic mania is the priority and the person can follow blood-monitoring requirements. Antipsychotics may be preferred when rapid control of severe mania is needed. Valproate-based treatment can be useful for some mood patterns, though reproductive safety restrictions are a major consideration.
In clinical practice, prescribers tend to judge lithium by patterns rather than one isolated day. Fewer sleepless nights, reduced impulsive behaviour, more regular routines, and fewer escalating mood symptoms can signal that the treatment plan is helping.
Doctors also look for early adverse effects that are easy to dismiss. New thirst, a changing tremor, persistent fatigue, constipation, or feeling unusually cold may point toward kidney, thyroid, or concentration-related issues that merit testing.
Lithium demands more follow-up than many psychiatric medicines. For people who respond well, that effort can be worthwhile because relapse prevention protects housing, employment, relationships, and physical safety.
Alcohol can worsen dehydration, disturb sleep, impair judgement, and make tremor or dizziness more noticeable. Heavy drinking may also make it harder to recognise early lithium toxicity. This routine also helps people notice symptoms that need medical advice. NHS guidance published in 2023 advises caution because alcohol can increase drowsiness and dehydration-related problems during lithium treatment. If alcohol use has triggered missed doses, vomiting, or poor fluid intake, the lithium care team should be contacted promptly.
A stable routine helps lithium treatment. Keep salt intake broadly consistent, drink fluids regularly, and replace fluids during prolonged exercise or hot weather rather than making sudden dietary changes. NICE guidance updated in 2023 supports physical health monitoring in bipolar disorder because weight, sleep, kidney function, and treatment adherence can all affect outcomes. Extreme fasting, crash diets, and severe dehydration can raise lithium levels.
Lithium and valproate-based medicines are both used as mood stabilisers, though their mechanisms and monitoring needs differ. Lithium requires plasma-level monitoring and has specific kidney and thyroid considerations, while valproate requires attention to liver health and carries major reproductive safety restrictions. The WHO mhGAP guideline published in 2023 recognises mood stabilisers as options in bipolar care, with selection based on episode pattern, medical history, and reproductive circumstances. Lithium may be favoured for classic episodic mania and long-term relapse prevention.
Severe kidney impairment can make lithium unsuitable because the kidneys remove lithium from the body. Reduced clearance can cause lithium to accumulate even when the prescribed schedule has not changed. The MHRA identifies reduced renal function as a major factor requiring close assessment during lithium treatment. A clinician may select a different mood-stabilising strategy where kidney function cannot support safe lithium use.
Non-steroidal anti-inflammatory drugs, including ibuprofen and naproxen, can reduce lithium clearance through the kidneys. The interaction may increase plasma lithium levels and raise the risk of toxicity, especially with regular use, dehydration, or pre-existing kidney impairment. FDA prescribing information for lithium carbonate, revised in 2022, lists NSAIDs among medicines that can increase lithium concentrations. A prescriber may arrange extra blood monitoring or choose another pain-relief approach when an anti-inflammatory medicine is needed.
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I took Lithium after repeated manic episodes. The first few weeks brought thirst and a slight tremor, which settled after my schedule was adjusted. I found the regular blood tests inconvenient, yet I had far fewer periods of racing thoughts over the following year.
I had been on Lithium for several months and my sleep became more predictable. I needed thyroid tests after feeling tired and cold, and my clinician treated the thyroid issue without stopping the mood plan. The monitoring took organisation, but it helped me take symptoms seriously.
I used Lithium alongside an antipsychotic after hospital treatment for mania. My hands shook more when I had a stomach bug and was barely drinking, so I contacted my care team that day. I disliked how much planning the medicine involved, although my mood became much steadier.
I took Lithium for nearly two years after several depressive and manic swings. I noticed that missing doses made me anxious about relapse, so I set a daily reminder. The frequent tests were frustrating at first, but my psychiatrist explained the results clearly and that made the routine easier.
