Liskonum™ Tablets

Liskonum Tablets are available in one strength. Each tablet contains 450 mg lithium carbonate (12.2 mmol Li⁺) in controlled-release form.

White, oblong, film-coated tablets, with convex faces and a breakline on both sides.

Liskonum is a controlled-release tablet, designed to reduce fluctuations in serum lithium levels and the likelihood of adverse reactions.

It is indicated for the treatment of acute episodes of mania or hypomania and for the prophylaxis of recurrent manic-depressive illness.

Dosage:

Adults only: Liskonum should be given twice a day.

Treatment of acute mania or hypomania

Patients should be started on one or one-and-a-half tablets twice a day. Dosage should then be adjusted to achieve a serum lithium level of 0.8 to a maximum of 1.5 mmol/l. Serum concentration of lithium should be measured after four to seven days' treatment and then at least once a week until dosage has remained constant for four weeks. When the acute symptoms have been controlled, recommendations for prophylaxis should be followed.

Prophylaxis: The usual starting dosage is one tablet twice a day. Dosage should then be adjusted until a serum level of 0.5 to 1.0 mmol/l is maintained. Serum concentration of lithium should be measured after four to seven days' treatment and then every week until dosage has remained constant for four weeks. Frequency of monitoring may then be gradually decreased to a minimum of once every two months, but should be increased following any situation where changes in lithium levels are possible (see Section 4.4).

Blood samples for measurement of serum lithium concentration should be taken just before a dose is due and not less than 12 hours after the previous dose.

Levels of more than 2 mmol/l must be avoided.

Elderly: Use with caution. Start with half a tablet twice a day and adjust serum levels to the lower end of the above ranges (see also Section 4.4).

The full prophylactic effect of lithium may not be evident for six to 12 months, and treatment should be continued through any recurrence of the illness.

Children: Not recommended for use in children under 12 years of age

Administration:

Oral.

Planned Discontinuation of Liskonum

Gradual withdrawal of lithium (over a period of at least 2 weeks) is recommended, as it may delay recurrence of the patient's underlying symptoms.

Discontinuation of Liskonum due to toxicity

On the first sign of toxicity, treatment should be immediately discontinued (see Section 4.4).

Do not use in patients with a history of hypersensitivity to lithium, impaired renal function, cardiac disease, or untreated hypothyroidism. Lithium should not be given to patients with low body sodium levels, including, for example, dehydrated patients, those on low sodium diets, or those with Addison's disease.

Vomiting, diarrhoea, intercurrent infection, fluid deprivation and drugs likely to upset electrolyte balance, such as diuretics, may all reduce lithium excretion and thereby precipitate intoxication; reduction of dosage may be required. Use with care in elderly patients as lithium excretion may also be reduced.

The possibility of hypothyroidism and of renal dysfunction arising during prolonged treatment should be borne in mind and periodic assessments made.

Histological changes (including tubulointerstitial nephropathy) have been reported after long-term treatment with lithium. These changes may lead to impaired renal function. It is unclear if these changes are always reversible on stopping lithium. It is advisable to monitor renal function periodically.

Patients should be warned of the symptoms of impending intoxication (see Section 4.8), of the urgency of immediate action should these symptoms appear, and also of the need to maintain a constant and adequate salt and water intake. Outpatients should be warned to take their medication at the stipulated time. If a dose is missed, the patient should wait until the next scheduled time of dosing. A double dose to make up for the dose that has been missed should not be taken. Treatment should be discontinued immediately on the first signs of toxicity, which include cardiovascular, renal, neurological and gastrointestinal events (see Section 4.8). Acute renal failure has been reported rarely with lithium toxicity.

Patients with the rare hereditary galactose intolerance, lactase deficiency or glucose-galactose malabsorption should not take Liskonum.

Lithium should be used with particular care in the elderly since this group may be particularly susceptible to toxicity due to decreasing renal function and hence elimination (see Dosage and Administration).

Interactions which increase lithium concentrations:

• Metronidazole

• Non-steroidal anti-inflammatory drugs, including selective cyclo-oxygenase (COX) II inhibitors (monitor serum lithium concentrations more frequently if NSAID therapy is initiated or discontinued)

• ACE inhibitors

• Angiotensin II receptor antagonists.

• Diuretics (thiazides show a paradoxical antidiuretic effect resulting in possible water retention and lithium intoxication)

Interactions which decrease serum lithium concentrations:

• Urea

• Xanthines

• Sodium bicarbonate containing products

• Diuretics (carbonic anhydrase inhibitors)

Interactions causing neurotoxicity:

• Neuroleptics (particularly haloperidol at higher dosages)

• Carbamazepine

• Methyldopa

• Selective Serotonin Re-uptake Inhibitors (e.g. fluvoxamine and fluoxetine) as this combination may precipitate a serotonergic syndrome.

• Calcium channel blockers

• Tri-cyclic antidepressants

Lithium may prolong the effects of neuromuscular blocking agents.

Lithium crosses the placental barrier. In animal studies, lithium has been reported to interfere with fertility, gestation and foetal development. There is epidemiological evidence that the drug may be harmful in human pregnancy. Lithium therapy should not be used during pregnancy, especially during the first trimester, unless considered essential. In certain cases where a severe risk to the patient could exist if treatment were to be stopped, lithium has been continued during pregnancy. If given, however, serum levels should be measured frequently because of the changes in renal function associated with pregnancy and parturition.

Since adequate human data on use during lactation and adequate animal reproduction studies are not available, bottle feeding is advisable.

As lithium may cause disturbances of the CNS, patients should be warned of the possible hazards when driving or operating machinery.

Initial therapy: Fine tremor of the hands, polyuria thirst and nausea may occur.

The frequency classifications for these adverse reactions cannot be accurately estimated from the available clinical trial data.

Blood and lymphatic system disorders: Leukocytosis

Endocrine disorders: Euthyroid goitre, hypothyroidism, hyperthyroidism, hyperparathyroidism

Metabolism and nutrition disorders: Hyperglycemia, hypercalcemia, weight gain, anorexia, polydipsia

Psychiatric disorders: Hallucinations, somnolence, memory loss

Nervous system disorders: Tremor, ataxia, peripheral sensorimotor neuropathy, hyperactive deep tendon reflexes, extrapyramidal symptoms, seizures, slurred speech, dizziness, vertigo, giddiness, nystagmus, stupor, coma, pseudotumor cerebri, dysgeusia, myasthenia gravis

Eye disorders: Scotomata, blurred vision

Cardiac disorders: Cardiac arrhythmia, of which bradycardia due to sinus node dysfunction is most frequent, and oedema. ECG changes: reversible flattening and inversion of T-waves.

Vascular disorders: Peripheral circulatory collapse, hypotension, Raynaud's phenomena

Gastrointestinal disorders: Nausea, vomiting, diarrhoea, gastritis, excessive salivation, dry mouth

Skin and subcutaneous tissue disorders: Alopecia, folliculitis, pruritus, psoriasis exacerbation, rash and other signs of skin hypersensitivity, acneiform eruptions, papular skin disorder

Musculoskeletal and connective tissue disorders: Muscle weakness, arthralgia, myalgia

Renal and urinary disorders: Symptoms of nephrogenic diabetes insipidus, and after long-term therapy, histological renal changes (including tubulointerstitial nephropathy) and impaired renal function

Reproductive system and breast disorders: Sexual dysfunction

General disorders and administration site conditions: Oedema, dazed feeling

Intoxication (see 4.4): Cardiovascular events e.g. QT/QTc prolongation. Gastrointestinal events e.g. vomiting, diarrhoea. Neurological events e.g. drowsiness, lack of co-ordination and/or a coarse tremor of the extremities and lower jaw may occur, especially with serum levels above the therapeutic range. Ataxia, giddiness, blurred vision, dysarthria, tinnitus, muscle hyperirritability, choreoathetoid movements peripheral neuropathy, hypoactive or absent deep tendon reflexes, and toxic psychosis have also been described.

If any of the above symptoms appear, treatment should be stopped immediately and arrangements made for serum lithium measurement.

The toxic concentrations for lithium are close to the therapeutic concentrations. Any overdose in a patient who has been taking chronic lithium therapy should be regarded as potentially serious. A single acute overdose usually carries low risk and patients tend to show mild symptoms only, irrespective of their serum lithium concentration. However more severe symptoms may occur after a delay if lithium elimination is reduced because of renal impairment, particularly if a slow-release preparation has been taken.

If an acute overdose has been taken by a patient on chronic lithium therapy, this can lead to serious toxicity occurring even after a modest overdose as the extravascular tissues are already saturated with lithium.

Symptoms

The onset of symptoms may be delayed, with peak effects not occurring for as long as 24 hours, especially in patients who are not receiving chronic lithium therapy, or following the use of a sustained release preparation.

Mild: Nausea, diarrhoea, vomiting, blurred vision, polyuria, light headedness, fine resting tremor, first degree heart block, muscular weakness and drowsiness.

Moderate: Increasing confusion, blackouts, fasciculation and increased deep tendon reflexes, myoclonic twitches and jerks, ataxia, choreoathetoid movements, urinary and faecal incontinence, increasing restlessness followed by stupor. Hypernatraemia.

Severe: Coma, convulsions, cerebellar signs, cardiac dysrhythmias including sino-atrial block, sinus and junctional bradycardia. Hypotension or rarely hypertension, circulatory collapse and renal failure.

Management

There is no known antidote. Supportive and symptomatic treatment should be initiated. Correction of electrolyte balance and fluid resuscitation is critical Gut decontamination is not useful for chronic accumulation. Whole bowel irrigation may be helpful in patients ingesting large quantities of slow-release preparation.

NOTE: activated charcoal does not adsorb lithium.

Haemodialysis is the treatment of choice for severe poisoning and should be considered in all patients with marked neurological features. It is the most efficient method of lowering lithium concentrations rapidly but substantial rebound increases can be expected when dialysis is stopped, and prolonged, or repeated treatments may be required. It should be considered also in acute, acute on chronic or chronic overdose in patients with severe symptoms regardless of serum lithium concentration; discuss with your local poisons service.

NOTE: Clinical improvement generally takes longer than reduction of serum lithium concentrations regardless of the method used.

Lithium carbonate is used as a source of lithium ions. The mechanism by which it exerts its effect in affective disorders is not known but may be related to inhibition of neurotransmitter receptor mediated processes involving beta-adrenoceptors. It is used in the treatment of acute episodes of mania or hypomania and for prophylaxis of recurrent manic depressive illness.

Lithium is readily absorbed from the gastrointestinal tract, and is distributed throughout the body over a period of several hours. Lithium is excreted almost exclusively in the kidneys but can also be detected in sweat and saliva. It is not bound to plasma proteins. It crosses the placenta, and is excreted in breast milk. The half-life of non-sustained lithium varies considerably, but generally is considered to be about 12 to 24 hours following a single dose. It is however increased for example in those with renal impairment and with age, and may increase significantly during long-term therapy.

Not applicable

Not applicable.

Liskonum Tablets have a shelf-life of five years.

Store below 25°C.

Opaque Blister Packs (OP) of 60 (6 x 10) tablets.

Tablets may be halved but should not be chewed or broken up.

Administrative Data

Smith Kline & French Laboratories Limited

Great West Road

Brentford

Middlesex TW8 9GS

Trading as:

GlaxoSmithKline UK,

Stockley Park West,

Uxbridge,

Middlesex, UB11 1BT

PL 0002/0083

29.09.02

July 2009