Lithium SR 400 mg

INDICATIONS

Lithium Carbonate is indicated in treatment and prophylaxis of mania, bipolar disorder and recurrent depression.

PHARMACOLOGY

Although lithium has been used for over 50 years in treatment of bipolar disorder, the mechanism of action is still unknown.  Lithium's therapeutic action may be due to a number of effects, ranging from inhibition of enzymes such as glycogen synthase kinase 3, inositol phosphatases, or modulation of glutamate receptors. Lithium Carbonate alters intraneuronal metabolism of catecholamines and sodium transport in neurons and muscle cells.

DOSAGE & ADMINISTRATION

Adult and child over 12 years: initially 1 gm to 1.5 gm daily; prophylaxis, initially 300-400 mg daily. Should be taken with food.

INTERACTION

Caution should be used when lithium and diuretics are used concomitantly because diuretic-induced sodium loss may reduce the renal clearance of lithium and increase serum lithium levels with risk of lithium toxicity. Lithium levels should be closely monitored when patients initiate or discontinue NSAID use. Indomethacin and piroxicam have been reported to increase significantly steady-state plasma lithium concentrations. Concurrent use of metronidazole with lithium may provoke lithium toxicity due to reduced renal clearance. There is evidence that ACE inhibitors, such as enalapril and captopril, may substantially increase steady-state plasma lithium levels, sometimes resulting in lithium toxicity. Concurrent use of calcium channel blocking agents with lithium may increase the risk of neurotoxicity in the form of ataxia, tremors, nausea, vomiting, diarrhoea and/or tinnitus. The concomitant administration of lithium with selective serotonin reuptake inhibitors should be undertaken with caution as this combination has been reported to result in symptoms such as diarrhea, confusion, tremor, dizziness and agitation. The following drugs can lower serum lithium concentrations by increasing urinary lithium excretion: acetazolamide, urea, xanthine preparations and alkalinizing agents such as sodium bicarbonate. The following have also been shown to interact with lithium: methyldopa, phenytoin and carbamazepine.

SIDE EFFECTS

Tiredness, loss of appetite, nausea, vomiting, diarrhoea, hands shaking, memory problems, increased thirst and consequently passing urine more often by day, and perhaps also by night.

PREGNANCY & LACTATION

Pregnancy Category D. An increased incidence of cardiovascular abnormality has been noted in infants of women given lithium during the first 3 months of pregnancy, such use should be avoided unless essential. Breast feeding is not advised unless the benefits of lithium use outweigh the advantages.

PRECAUTIONS & WARNINGS

Decreased tolerance to lithium has been reported to ensue from protracted sweating or diarrhoea and, if such occur, supplemental fluid and salt should be administered under careful medical supervision and lithium intake reduced or suspended until the condition is resolved.

THERAPEUTIC CLASS

Anti-manic drugs

STORAGE CONDITIONS

Keep below 30°C temperature, away from light & moisture. Keep out of the reach of children.