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Lithium

What Is Lithium?

Lithium is a mood-stabilising medication that contains the active ingredients lithium carbonate and lithium citrate. It is classified in the mental health therapeutic category and is supplied in 300 mg oral pills. In the United Kingdom, lithium is a prescription-only medicine (POM) regulated by the Medicines and Healthcare products Regulatory Agency (MHRA) and recommended for use by the National Institute for Health and Care Excellence (NICE) when treating specific mood disorders.

How Lithium Works in the Body

Lithium’s therapeutic effect stems from several biochemical actions that together help to stabilise mood:

• Modulation of neuronal signaling - Lithium interferes with the phosphoinositide signalling cascade, reducing over-activity of intracellular second messengers that are thought to contribute to mood swings.
• Inhibition of glycogen synthase kinase-3β (GSK-3β) - By dampening this enzyme, lithium influences neuroplasticity and circadian rhythm regulation.
• Alteration of neurotransmitter balance - Lithium modestly raises serotonin availability while decreasing excitatory glutamate release, helping to calm hyper-active neural pathways.

These mechanisms collectively help to prevent the extreme highs (mania) and lows (depression) characteristic of bipolar disorder. The drug reaches peak plasma concentrations within 1-2 hours after ingestion, and its therapeutic effects develop gradually over days to weeks as steady-state concentrations are achieved.

Conditions Treated by Lithium

Lithium is approved by the MHRA for the long-term management of bipolar affective disorder (both manic and depressive phases). It is also indicated for the prevention of mood episodes in patients with a history of recurrent bipolar episodes. Use is typically reserved for adults, although specialist paediatric psychiatrists may consider it for adolescents under strict monitoring.

Evidence-Based Off-Label Uses

Augmentation of Major Depressive Disorder

• Evidence: Controlled trials and meta-analyses have demonstrated that adding low-dose lithium to standard antidepressant therapy can accelerate response and reduce relapse rates in treatment-resistant major depressive disorder.
• Regulatory status: This use is off-label in the UK; it is not formally approved by the MHRA for depression alone.
• Disclaimer: Off-label use requires careful supervision by a qualified psychiatrist, with regular monitoring of lithium levels and renal function.

Who Should (Not) Use Lithium?

Absolute Contraindications

• Known hypersensitivity to lithium salts or any excipients in the tablet.
• Severe renal impairment (eGFR < 30 mL/min/1.73 m²).
• Significant cardiovascular disease such as uncontrolled arrhythmias or recent myocardial infarction.
• Current use of sodium-depleting diuretics (e.g., thiazides) that cannot be safely adjusted.
• Pregnancy - lithium crosses the placenta and is associated with a risk of cardiac malformations (especially in the first trimester).

Relative Contraindications

• Mild-to-moderate renal dysfunction (eGFR 30-60 mL/min/1.73 m²).
• Thyroid disease - lithium may exacerbate hypothyroidism; thyroid function should be checked before initiation.
• Elderly patients - age-related decline in renal clearance may necessitate lower maintenance doses.
• Concomitant use of non-steroidal anti-inflammatory drugs (NSAIDs) or ACE inhibitors, which can raise lithium concentrations.

Special Populations

• Pregnancy & lactation: Generally avoided; if continuation is essential, the lowest effective dose is used with close fetal monitoring.
• Elderly: Start at reduced doses, monitor renal and thyroid function more frequently.
• Patients with a history of bipolar disorder who are stable: Continue maintenance therapy to reduce relapse risk.

Safety Profile: Side Effects and Interactions

Common Side Effects

• Tremor - Fine, postural tremor that may lessen with dose adjustment.
• Thirst and polyuria - Result of lithium’s effect on renal concentrating ability; maintain adequate hydration.
• Weight gain - Modest increase in body weight over months of therapy.
• Gastrointestinal discomfort - Nausea, mild diarrhoea, or abdominal cramping, usually transient.

Serious Adverse Events

• Lithium toxicity - Presents with coarse tremor, confusion, ataxia, seizures, or cardiac arrhythmias; requires urgent medical assessment.
• Nephrogenic diabetes insipidus - Chronic renal concentrating defect leading to excessive urine output.
• Hypothyroidism - Can develop after months of therapy; routine thyroid-stimulating hormone (TSH) testing is advised.
• Neurotoxicity - Rare but may manifest as severe cerebellar dysfunction at high serum levels.

Major Drug Interactions

• Thiazide diuretics - Decrease renal lithium clearance → raise serum lithium; dose reduction or alternative diuretic recommended.
• NSAIDs - Similar effect on renal handling; monitor levels closely if co-prescribed.
• ACE inhibitors & ARBs - Can increase lithium concentrations; dosage adjustments may be necessary.
• Serotonergic agents - Combined use may raise the risk of serotonin syndrome; monitor for agitation, hyperreflexia, and hyperthermia.

Food and Lifestyle Interactions

• Sodium intake - Low dietary sodium can increase lithium reabsorption, raising blood levels. Encourage a consistent sodium diet.
• Alcohol - Excessive alcohol may exacerbate dehydration and increase toxicity risk; moderation is advised.
• Driving - At therapeutic levels lithium rarely impairs cognition, but severe side effects (tremor, dizziness) may affect safe driving.

If specific interaction data for a particular medication is unavailable, patients should always inform their healthcare provider of all current prescriptions, over-the-counter products, and supplements.

How to Take Lithium

• Standard dosing - Lithium tablets are supplied as 300 mg units. Initiation usually starts with one tablet taken once daily; the dose is then titrated based on serum lithium concentrations and clinical response.
• Frequency - Most patients take lithium in two divided doses (e.g., 300 mg twice daily) to maintain stable blood levels, but exact timing must follow the prescribing clinician’s instructions.
• Special populations -
• Renal impairment: Begin with a lower dose (e.g., 150 mg once daily) and increase slowly if tolerated.
• Elderly: Consider starting at half the usual dose and monitor more frequently.
• Administration - Swallow the pill whole with a full glass of water. It can be taken with or without food, but consistency (same meals) helps maintain stable plasma levels.
• Missed dose - If a dose is forgotten and the scheduled time is less than 6 hours away, take the missed tablet; otherwise skip it and resume the regular schedule. Do not double up to compensate.
• Overdose - Symptoms may include severe tremor, vomiting, diarrhoea, confusion, and seizures. Seek emergency care immediately; dialysis is the definitive treatment for life-threatening lithium accumulation.
• Discontinuation - Abrupt cessation can precipitate mood destabilisation. A gradual taper, often over 1-2 weeks, is recommended under psychiatric guidance.

Monitoring and Follow-Up

• Serum lithium level - Target therapeutic range is 0.6-1.0 mmol/L for maintenance; 0.4-0.6 mmol/L may be used during dose initiation. Levels are checked 5-7 days after each dose change, then every 3-6 months once stable.
• Renal function - Serum creatinine and eGFR are measured before starting therapy and at least annually thereafter.
• Thyroid function - TSH and free T4 are assessed at baseline and annually; more frequent testing if hypothyroidism is suspected.
• Electrolytes - Sodium, potassium, and calcium may be monitored periodically, especially if diuretics are co-prescribed.
• Clinical review - Patients should attend regular psychiatric appointments to assess mood stability, side-effect burden, and overall adherence.

Storage and Handling

• Store tablets at room temperature (15-25 °C), protected from moisture and direct sunlight.
• Keep the medication in its original container with the child-proof safety cap engaged.
• Do not use any tablets that are past the printed expiration date.
• For disposal, return unused tablets to a pharmacy or follow local hazardous waste guidelines; do not flush them down the toilet.

Medication-Specific Glossary

GSK-3β (Glycogen Synthase Kinase-3β)

An enzyme involved in cellular signalling that influences mood regulation; lithium’s inhibition of GSK-3β contributes to its stabilising effects.

Nephrogenic Diabetes Insipidus

A condition where the kidneys become less responsive to antidiuretic hormone, leading to excessive urine output; a recognized long-term effect of lithium therapy.

Therapeutic Window

The range of serum lithium concentrations that provides efficacy while minimising toxicity (generally 0.6-1.0 mmol/L).

Medical Disclaimer

This article provides educational information about lithium and is not a substitute for professional medical advice. Treatment decisions, including the use of lithium for unapproved indications, must be made under the guidance of a qualified healthcare provider. The content is intended for informational purposes only and does not constitute medical recommendations. Always consult a physician before starting, stopping, or changing any medication regimen.