<prompt> Which of the following is not a side effect of lithium?Blood dyscrasiasPolyuriaHypothyroidismWeight gain  <response>: Ans: a Blood dyscrasiasRef: Kaplan Sadocks Synopsis of Psychiatry: Behavioral SciencesClinical Psychiatry, 10th ed, Pg. 1058Lithium dose and its toxicity are very favourite topics for Kerala PG Entrance Examination.Blood dyscrasias are not seen as a side effect of lithium therapy.Side effects of lithium therapy NeurologicBenign, nontoxic: Dysphoria, lack of spontaneity, slowed reaction time, memory difficulties Tremor - Postural, occasional extrapyramidal Toxic - Coarse tremor, dysarthria, ataxia, neuromuscular irritability, seizures, coma, death Miscellaneous - Peripheral neuropathy, benign intracranial hypertension, myasthenia gravis-like syndrome, altered creativity, lowered seizure thresholdEndocrineThyroid - goiter, hypothyroidism, exophthalmos, hyperthyroidism rareParathyroid - hyperparathyroidism, adenomaCardiovascularBenign T-wave changes, sinus node dysfunctionRenalConcentrating defect, morphologic changes, polyuria nephrogenic diabetes insipidus, reduced GFR, nephrotic syndrome, renal tubular acidosisDermatologicAcne, hair loss, psoriasis, rashGastrointestinalAppetite loss, nausea, vomiting, diarrhoea Miscellaneous - Altered carbohydrate metabolism, weight gain, fluid retention 