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  • Title: [Pharmacokinetics of lithium in rats of various ages].
    Author: Kersten L.
    Journal: Acta Biol Med Ger; 1979; 38(9):1331-45. PubMed ID: 550669.
    Abstract:
    The kinetics of lithium in serum was determined in rats aged 5 to 240 days, after 2 days of pretreatment with 0.15 mval Li+/100 g and a load of 0.3 mval Li+/100 g body weight at the day of experiments. In rats age differences in distribution and elimination of lithium can be described by a two-compartment model. The kinetic parameters were calculated (half-life(serum), apparent volume of distribution, rate constants of distribution and elimination, total plasma clearance) and, additionally, age differences in renal elimination were determined (renal clearance, half-life (urine)). The ability to excrete lithium is not fully developed in 5-day-old rats: t1/2serum (23 h) and especially t1/2urine (72 h) are much longer than in adult rats (t1/2serum = 12 h; t1/2urine = 6.4 h). The influence of administered lithium on the regulation of the electrolyte balance in the organism (sodium, potassium) occurred differently in dependence on age. Consequences of the investigations are discussed for the therapy with lithium in different age periods.
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