Lithium (Lithium Carbonate or Lithium Citrate) – Patient Information for Australia

Lithium is a well-established medicine used to help manage certain mental health conditions, most notably bipolar disorder. Because it has a narrow therapeutic range (the amount needed for benefit is close to the amount that can cause harm), safe use requires careful dosing, regular blood tests, and attention to fluid balance and interacting medicines.

This guide is written for patients and carers in Australia. It explains how lithium works, how it behaves in the body, how and when it is usually taken, key interaction risks (including with food, alcohol and other medicines), practical tips, and when to seek medical help.

Basic product information

Important: The right dose depends on your personal situation, blood test results, kidney function, age, hydration status, and other medicines.

How lithium works (mechanism of action)

Lithium’s exact mechanism is complex and not fully explained, but several actions contribute to its mood-stabilising effects:

• Modulates brain signalling by affecting neurotransmitter activity.
• Influences intracellular processes (including second messenger pathways), which can affect mood regulation.
• Supports stability of nerve cell function over time, helping reduce relapse risk.
• May have anti-aggressive and anti-impulsive effects in some patients.

Lithium is not an immediate “calming” medication like a sedative. Many benefits develop over days to weeks, and ongoing maintenance helps reduce future episodes.

Pharmacokinetics (how the body handles lithium)

Understanding pharmacokinetics helps explain why lithium monitoring is essential.

• Absorption: Lithium is absorbed after oral dosing. Food and gastrointestinal factors may influence absorption slightly, but consistent timing is usually recommended.
• Distribution: Lithium distributes through body water and can affect the brain and other organs. Because it behaves like an ion, hydration status matters.
• Metabolism: Lithium is not metabolised by the liver.
• Elimination: Lithium is primarily eliminated by the kidneys. Reduced kidney function, dehydration, or changes in salt/water intake can increase lithium levels.
• Half-life: Lithium’s half-life is typically around ~18 to 24 hours in adults (may be longer in older adults or with reduced kidney function).

Because lithium is cleared by the kidneys, blood levels can rise quickly if kidney function changes or if you become dehydrated.

Typical uses in Australia

Lithium is mainly used to treat and prevent episodes of mood disorders, particularly:

• Bipolar disorder (maintenance): Helps prevent relapse of mania and depression.
• Acute mania: In some cases, lithium may be used as part of acute management plans, often alongside other medicines depending on severity and clinician judgement.

Your treatment plan may vary—some people use lithium as long-term maintenance; others may use it during particular phases of illness.

When to take lithium (timing guidance)

Consistency is key. Many regimens are designed to keep lithium levels stable and reduce peaks and troughs.

• Take at the same times each day.
• Follow the exact dosing schedule on your medicine label. Doses may be divided or taken once daily depending on the formulation and your monitoring results.
• Blood tests timing: Lithium levels are often checked as a “trough” sample (just before the next dose). Your healthcare provider or laboratory will advise the specific timing for the blood test.

Missed dose: If you miss a dose, do not double up unless your prescriber or pharmacist advises you to. Contact your healthcare team for guidance, especially if you are close to the next dose.

Food interactions and diet considerations

Lithium is affected by fluid and salt balance. While lithium is not “food dependent” in the way some medicines are, changes in diet and hydration can influence blood levels.

• Hydration: Aim for consistent fluid intake. Dehydration increases lithium levels.
• Salt intake: Sudden large changes in salt (sodium) intake can affect lithium levels. Avoid major dietary changes without clinician input.
• Sickness and fasting: Vomiting, diarrhoea, overheating, or fasting can cause dehydration—these situations increase the risk of high lithium levels.
• Regular meals: Taking lithium with meals may improve tolerability if it upsets your stomach, but follow your label and clinician advice.

If you plan to start a low-salt diet, high fluid intake regime, or supplements that affect electrolytes, discuss it with your healthcare provider first.

Alcohol interactions

Alcohol is not always a direct “lithium interaction,” but it can increase risk through dehydration, reduced hydration awareness, and potential changes to sleep patterns and judgement.

• Limit alcohol: In particular, avoid binge drinking.
• Avoid alcohol during illness: Vomiting, diarrhoea, fever, or poor intake increases risk.
• Be cautious with sedating drinks or mixing: Some people may also take other medicines that affect alertness; alcohol can add to these effects.

If you are unsure, ask your pharmacist or doctor about a personalised approach.

Medicine interactions (very important)

Lithium levels can rise or fall when interacting medicines are started, stopped, or dose-adjusted. Some interactions can be dangerous. Always check with a pharmacist before combining lithium with new medicines, including over-the-counter products and supplements.

Medicines that commonly increase lithium levels (risk of toxicity)

• Non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen, naproxen, and diclofenac.
• ACE inhibitors (blood pressure medicines) such as enalapril, lisinopril.
• Angiotensin receptor blockers (ARBs) such as losartan, valsartan.
• Diuretics (“water tablets”), especially thiazides and some loop diuretics.
• Some antidepressants and other psychiatric medicines—interaction risk varies and should be reviewed by your clinician.

Medicines and situations that may affect kidney function or hydration

• Dehydrating conditions: persistent diarrhoea, vomiting, fever, heavy sweating, heat exposure.
• Nephrotoxic medicines: some antibiotics, antifungals, and other drug classes can affect kidneys.

Supplements: Herbal products and “detox” supplements may affect kidney function or fluid balance in unpredictable ways. Tell your pharmacist what you take.

Indications (what lithium is used for)

In Australia, lithium is used for mood stabilisation in conditions such as:

• Bipolar disorder, including prevention of relapse and treatment of manic episodes in appropriate circumstances.
• Long-term maintenance to reduce recurrence of mania and depression for suitable patients.

Your doctor may tailor the plan based on symptoms, past response, comorbidities (such as kidney disease), age, and tolerance.

Dosing: how much lithium is used

Dosing must be individualised. Because lithium has a narrow safety margin, the “dose” is guided by:

• your lithium blood level,
• kidney function (creatinine/eGFR and other factors),
• age and body water,
• current symptoms, and
• other medicines and hydration status.

Typical adult regimens vary and may be once daily or divided doses depending on the formulation and monitoring plan.

Do not adjust your dose without clinician guidance. Even small changes in dose or timing can alter lithium levels.

What the “target level” means

Target ranges are set by clinicians based on the reason for treatment (maintenance vs acute symptoms) and your risk factors. Regular blood monitoring ensures levels stay within the safe effective range for you.

Monitoring schedule (commonly used approach)

• Before starting: Kidney function tests, thyroid function tests, and baseline lithium level if relevant.
• After starting or changing dose: Lithium levels are usually checked frequently (for example, after steady-state is reached) and then periodically.
• Ongoing: Periodic lithium level checks plus kidney and thyroid tests (frequency varies by risk and stability).

If you become ill, start or stop interacting medicines, or change fluid intake substantially, your clinician may recheck your lithium level sooner.

Safety profile and side effects

Lithium can be very effective, but it requires ongoing safety monitoring. Side effects vary between individuals and may change over time.

Common side effects

• Thirst and increased urination
• Mild tremor (shakiness), particularly in the hands
• Stomach upset, nausea, diarrhoea (often improved with dose adjustments)
• Weight changes (some people gain or lose weight)
• Fatigue or feeling “slowed down” (varies by dose)
• Muscle weakness or coordination changes in higher levels

Serious risks

• Lithium toxicity: Risk increases with dehydration, kidney impairment, or interacting medicines.
• Kidney effects: Long-term use can affect kidney concentrating ability in some people.
• Thyroid effects: Lithium can contribute to hypothyroidism or thyroid dysfunction.
• Neurological symptoms: Confusion, severe unsteadiness, seizures (urgent emergency symptoms in toxicity).

Warning signs—seek urgent medical help

Contact emergency services or go to an emergency department if you have symptoms suggestive of lithium toxicity, such as:

• Severe vomiting or diarrhoea
• Marked worsening tremor, uncontrollable shaking
• Severe drowsiness, confusion, or fainting
• New trouble walking, severe unsteadiness
• Slurred speech or unusual clumsiness
• Seizures

If you feel unwell and suspect your hydration is affected, it’s safer to contact your healthcare team promptly for advice about checking levels.

Practical use tips (to stay safe and consistent)

• Stay hydrated consistently: Especially during hot weather, exercise, or illness.
• Know your “sick day” plan: If you have vomiting/diarrhoea/fever or cannot drink normally, contact your clinician for guidance about lithium and blood testing.
• Avoid dehydration: Be careful with heavy sweating, sauna/heat exposure, and excessive caffeine.
• Keep your medication routine: Use a daily reminder system to reduce missed or double doses.
• Keep a list of medicines: Include prescriptions, over-the-counter pain relief, and supplements—share it with each healthcare provider.
• Before pain relief, ask first: Many people use NSAIDs for pain, but these can interact with lithium. Ask your pharmacist what is safer for you.
• Track symptoms: Changes in thirst, tremor, coordination, or stomach upset may signal the need for level checks.
• Don’t change salt intake suddenly: Maintain a consistent diet and discuss planned changes.

Alternative options (if lithium isn’t suitable)

If lithium is not tolerated, not effective, or not safe due to kidney/thyroid issues or interactions, clinicians may consider other options depending on your diagnosis and history.

Common alternatives for mood stabilisation

• Valproate (sodium valproate)
• Carbamazepine
• Lamotrigine (often used particularly for bipolar depression prevention)
• Atypical antipsychotics for acute episodes or maintenance in selected patients

Your clinician will consider benefits, side effects, monitoring requirements, and interaction profiles. Never switch or stop lithium abruptly without medical advice.

Market and legal context for Australia

Medicines containing lithium are regulated in Australia to support safe and appropriate use. Because lithium has a narrow therapeutic range and potential toxicity risks, extra safeguards—such as prescribing and monitoring requirements set by clinical guidelines—may apply.

Availability depends on:

• the specific formulation (e.g., lithium carbonate vs lithium citrate),
• manufacturer supply and product listing, and
• your location and pharmacy arrangements.

In Australia, always rely on Australian product information and follow guidance from your treating healthcare professionals. If you have concerns about safety or monitoring, discuss them promptly.

Recent guidance and monitoring expectations

Guidance around lithium use continues to emphasise:

• Regular therapeutic drug monitoring (blood lithium levels),
• Ongoing kidney and thyroid monitoring,
• Education on toxicity symptoms, and
• Early review after dose changes or intercurrent illness (vomiting/diarrhoea/dehydration) or when interacting medicines are started.

Clinicians may update monitoring frequency based on individual risk factors—particularly age, kidney function, and whether other interacting medicines are used.

Delivery, availability and ordering (online pharmacy information)

Availability of lithium products can vary. When ordering online, your pharmacy may require:

• verification of your details and product suitability,
• confirmation of your medicine strength and form, and
• information for safety checks (such as other medicines you use).

Delivery times: Delivery timelines depend on pharmacy processing time and the courier service for your area. Many products are dispatched quickly when in stock; however, occasional delays can occur due to supplier availability.

Packaging and storage: Store lithium products as directed on the label. Keep medicines away from moisture and heat, and store out of reach of children.

Cold chain: Lithium products typically do not require refrigeration unless specified by the specific brand—always check the product label.

FAQ: Frequently asked questions about lithium

1) How quickly does lithium start working?

Some symptom changes may occur within days, but full benefits often take weeks. Maintenance benefits build over time. Your clinician will set expectations based on the goal of treatment.

2) Why do I need blood tests?

Lithium levels must stay within a safe and effective range. Because lithium is cleared by the kidneys and interacts with other medicines and hydration status, blood monitoring helps prevent toxicity and guides dose adjustments.

3) What should I do if I get sick with vomiting or diarrhoea?

Dehydration can increase lithium levels. Contact your healthcare team promptly for advice. They may recommend temporarily holding lithium and checking blood levels, but only follow guidance provided for your specific plan.

4) Can I take ibuprofen or other painkillers with lithium?

NSAIDs such as ibuprofen can increase lithium levels and raise toxicity risk. Ask your pharmacist what alternative pain relief is safest for you before taking NSAIDs.

5) Does lithium interact with blood pressure medicines or diuretics?

Yes. Several blood pressure medicines (including ACE inhibitors and ARBs) and diuretics can increase lithium levels by affecting kidney handling. Let your clinician/pharmacist know before starting or changing these medicines.

6) What are the early signs of lithium toxicity?

Early signs can include worsening nausea, diarrhoea, tremor, unsteadiness, unusual drowsiness, or confusion. Severe symptoms require urgent medical assessment.

7) Can I drink alcohol while taking lithium?

Small amounts may be possible for some people, but alcohol can increase dehydration and add to side effects such as sedation. Limit alcohol, and avoid drinking if you are unwell or have reduced fluid intake.

8) Will I need thyroid or kidney tests?

Yes. Lithium can affect thyroid function and, in some people, kidney function. Regular monitoring is a key part of safe long-term use.

9) Can diet affect lithium levels?

Yes. Sudden changes in salt intake and changes in hydration can affect lithium concentrations. Try to maintain consistent fluid intake and avoid abrupt dietary changes unless your clinician advises otherwise.

10) What if I miss a dose?

Generally, don’t double up. Contact your pharmacist or healthcare provider for advice, particularly if you think your schedule may affect monitoring timing.

Need further assistance?

If you have questions about lithium safety, side effects, interactions, or monitoring, speak with your pharmacist or treating clinician. They can help you understand what matters most for your individual situation.