Dexamethasone¿¡ ´ëÇÑ Mechanism_Of_Action Á¤º¸ Dexamethasone is a glucocorticoid agonist. Unbound dexamethasone crosses cell membranes and binds with high affinity to specific cytoplasmic receptors. This results in a modification of transcription and, hence, protein synthesis in order to achieve inhibition of leukocyte infiltration at the site of inflammation, interference in the function of mediators of inflammatory response, suppression of humoral immune responses, and reduction in edema or scar tissue. The antiinflammatory actions of dexamethasone are thought to involve phospholipase A2 inhibitory proteins, lipocortins, which control the biosynthesis of potent mediators of inflammation such as prostaglandins and leukotrienes. Tobramycin¿¡ ´ëÇÑ Mechanism_Of_Action Á¤º¸ Tobramycin binds irreversibly to one of two aminoglycoside binding sites on the 30 S ribosomal subunit, inhibiting bacterial protein synthesis. Tobramycin may also destabilize bacterial memebrane by binding to 16 S 16 S r-RNA. An active transport mechanism for aminoglycoside uptake is necessary in the bacteria in order to attain a significant intracellular concentration of tobramycin.
Pharmacology
Dexamethasone¿¡ ´ëÇÑ Pharmacology Á¤º¸ Dexamethasone and its derivatives, dexamethasone sodium phosphate and dexamethasone acetate, are synthetic glucocorticoids. Used for its antiinflammatory or immunosuppressive properties and ability to penetrate the CNS, dexamethasone is used alone to manage cerebral edema and with tobramycin to treat corticosteroid-responsive inflammatory ocular conditions. Tobramycin¿¡ ´ëÇÑ Pharmacology Á¤º¸ Tobramycin, an aminoglycoside antibiotic obtained from cultures of Streptomyces tenebrarius, is used in combination with other antibiotics to treat urinary tract infections, gynecologic infections, peritonitis, endocarditis, pneumonia, bacteremia and sepsis, respiratory infections including those associated with cystic fibrosis, osteomyelitis, and diabetic foot and other soft-tissue infections.
Dexamethasone¿¡ ´ëÇÑ ´Ü¹é°áÇÕ Á¤º¸ 70% Tobramycin¿¡ ´ëÇÑ ´Ü¹é°áÇÕ Á¤º¸ Not Available
Half-life
Dexamethasone¿¡ ´ëÇÑ ¹Ý°¨±â Á¤º¸ 36-54 hours Tobramycin¿¡ ´ëÇÑ ¹Ý°¨±â Á¤º¸ Not Available
Absorption
Dexamethasone¿¡ ´ëÇÑ Absorption Á¤º¸ 80-90% Tobramycin¿¡ ´ëÇÑ Absorption Á¤º¸ Not Available
Biotransformation
Dexamethasone¿¡ ´ëÇÑ Biotransformation Á¤º¸ Hepatic. Tobramycin¿¡ ´ëÇÑ Biotransformation Á¤º¸ Not Available
Toxicity
Dexamethasone¿¡ ´ëÇÑ Toxicity Á¤º¸ Oral, rat LD50: >3 gm/kg. Signs of overdose include retinal toxicity, glaucoma, subcapsular cataract, gastrointestinal bleeding, pancreatitis, aseptic bone necrosis, osteoporosis, myopathies, obesity, edemas, hypertension, proteinuria, diabetes, sleep disturbances, psychiatric syndromes, delayed wound healing, atrophy and fragility of the skin, ecchymosis, and pseudotumor cerebri. Tobramycin¿¡ ´ëÇÑ Toxicity Á¤º¸ LD50=441mg/kg (s.c. in mice)
Drug Interactions
Dexamethasone¿¡ ´ëÇÑ Drug_Interactions Á¤º¸ Ambenonium The corticosteroid decreases the effect of anticholinesterasesAminoglutethimide Aminogluthetimide decreases the effect of dexamethasoneAmobarbital The barbiturate decreases the effect of the corticosteroidAnisindione The corticosteroid alters the anticoagulant effectAprepitant Aprepitant increases the effect and toxicity of dexamethasoneAprobarbital The barbiturate decreases the effect of the corticosteroidAspirin The corticosteroid decreases the effect of salicylatesButabarbital The barbiturate decreases the effect of the corticosteroidButalbital The barbiturate decreases the effect of the corticosteroidButethal The barbiturate decreases the effect of the corticosteroidDicumarol The corticosteroid alters the anticoagulant effectDihydroquinidine barbiturate The barbiturate decreases the effect of the corticosteroidEdrophonium The corticosteroid decreases the effect of anticholinesterasesEthotoin The enzyme inducer decreases the effect of the corticosteroidFosphenytoin The enzyme inducer decreases the effect of the corticosteroidHeptabarbital The barbiturate decreases the effect of the corticosteroidHexobarbital The barbiturate decreases the effect of the corticosteroidImatinib Decreases levels of imatinibMephenytoin The enzyme inducer decreases the effect of the corticosteroidMethohexital The barbiturate decreases the effect of the corticosteroidMethylphenobarbital The barbiturate decreases the effect of the corticosteroidMidodrine Increased arterial pressureNeostigmine The corticosteroid decreases the effect of anticholinesterasesPentobarbital The barbiturate decreases the effect of the corticosteroidPhenobarbital The barbiturate decreases the effect of the corticosteroidPhenytoin The enzyme inducer decreases the effect of the corticosteroidPrimidone The barbiturate decreases the effect of the corticosteroidPyridostigmine The corticosteroid decreases the effect of anticholinesterasesQuinidine barbiturate The barbiturate decreases the effect of the corticosteroidRifampin The enzyme inducer decreases the effect of the corticosteroidSecobarbital The barbiturate decreases the effect of the corticosteroidSunitinib Possible decrease in sunitinib levelsTalbutal The barbiturate decreases the effect of the corticosteroidWarfarin The corticosteroid alters the anticoagulant effectBismuth The corticosteroid decreases the effect of salicylatesAcenocoumarol The corticosteroid alters the anticoagulant effectSalicylate-magnesium The corticosteroid decreases the effect of salicylatesSalsalate The corticosteroid decreases the effect of salicylates Tobramycin¿¡ ´ëÇÑ Drug_Interactions Á¤º¸ Not Available
Dexamethasone¿¡ ´ëÇÑ Food Interaction Á¤º¸ Avoid alcohol.Take with food to reduce irritation.Avoid taking with grapefruit juice. Tobramycin¿¡ ´ëÇÑ Food Interaction Á¤º¸ Not Available
Dexamethasone¿¡ ´ëÇÑ Description Á¤º¸ An anti-inflammatory 9-fluoro-glucocorticoid. [PubChem] Tobramycin¿¡ ´ëÇÑ Description Á¤º¸ An aminoglycoside, broad-spectrum antibiotic produced by Streptomyces tenebrarius. It is effective against gram-negative bacteria, especially the pseudomonas species. It is a 10% component of the antibiotic complex, nebramycin, produced by the same species. [PubChem]
The database contains the following fields: The generic name of each chemical For module A10 (liver enzyme composite module): Overall activity category for each compound (A for active, M for marginally active, or I for inactive) based on the number of active and marginally active scores for each compound at the five individual endpoints (see research article for full description of method) Number of endpoints at which each compound is marginally active (M) Number of endpoints at which each compound is active (A) For modules A11 to A15 (alkaline phosphatase increased, SGOT increased, SGPT increased, LDH increased, and GGT increased, respectively): Overall activity category for each compound (A for active, M for marginally active, or I for inactive) based on the RI and ADR values (see the research article for full description of method) Number of ADR reports for each compound, given as <4 or ¡Ã4 Reporting Index value for each compound, except where no shipping units were available (NSU) Group 1 comprises of compounds for which ADR data were available for the first five years of marketing, so when no ADR reports were listed during this period the compounds were evaluated as inactive. Group 2 comprises of compounds for which a 'steady state' period of ADR data were available (1992-1996). In cases where no ADR reports were filed during this period, the compounds were scored as 'NA' (data not available) since they may have had one or more ADR reports during their first five years of marketing which should not be negated by a lack of ADR reports during the steady-state period. DEXAMETHASONE [GGT Increase] [Composite Activity] (Score) NA (Marginal) 0 (Active) 0
[Alkaline Phosphatase Increase] (Activity Score) NA (Number of Rpts) NA (Index value) NA
[SGOT Increase] (Activity Score) NA (Number of Rpts) NA (Index value) NA
[SGPT Increase] (Activity Score) NA (Number of Rpts) NA (Index value) NA
[LDH Increase] (Activity Score) NA (Number of Rpts) NA (Index value) NA
[GGT Increase] (Activity Score) NA (Number of Rpts) NA (Index value) NA