Сборник V международной
IDENTIFICATION OF DEXAMETHASONE IN SUBSTANCES
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IDENTIFICATION OF DEXAMETHASONE IN SUBSTANCES
AND DOSAGE FORMS Saidvaliyev A.K., Murodova N.A., Ag’loxodjayeva Sh.M. Tashkentt Pharmacuetical institute email: murodova.nigina@inbox.ru Introduction. Dexamethasone is widely used in medical practice, mainly for the treatment o f aller gic diseases. The anti allergic effect develops as a result of a decrease in the synthesis and secretion o f aller gy mediators, inhibition of the release o f histamine and other biologically active substances from sensitized obese cells and basophiles, a decrease in the number o f circulating basophils, T- and B-lymphocytes, mast cells; suppression of the development o f lymphoid and connective tissue, reducing the sensitivity o f effec tor cells to allergy mediators, inhibition of antibody production, changes in the body’s immune response. Dexamethasone is available in 0.0005 g (0.5 mg) tablets. In case o f an overdose, acute poisoning can occur, which ends in death. The peculiarity of the action is a significant inhibition o f the function o f the pituitary gland and the almost complete absence o f mineralocortico steroid activity. Doses of 1-1.5 mg/day inhibit the function of the adrenal cortex; the biological half-life is 32-72 hours (the duration o f the inhibition of the hypothalamus-pituitary-adrenal cortex system). By the strength of glucocorticoid activity, 0.5 mg of dexamethasone corresponds to approximately 3.5 mg of prednisone (or prednisolone), 15 mg of hydrocortisone, or 17.5 mg o f cortisone. Daily dose for adults is 0.002-0.003 g (2-3 mg), in case of severe condition of the patient, 0.004-0.001 g (4-10 mg) is recommended. The authenticity of dexamethasone in substances is determined by the polarimetric method. Also at the expense of oxygen, instead of ethyl alcohol, the reaction is carried out in methyl alcohol with a phenylhydrazone reagent, which gives a slightly yellow color. Download 5.86 Mb. Do'stlaringiz bilan baham: |
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