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A loading dose is most useful for drugs that are eliminated from the body relatively slowly, i.e. have a long systemic half-life. Such drugs need only a low maintenance dose in order to keep the amount of the drug in the body at the appropriate therapeutic level, but this also means that, without an initial higher dose, it would take a long ...
Low-dose and high-dose variations of the test exist. [4] The test is given at low (usually 1–2 mg) and high (8 mg) doses of dexamethasone, and the levels of cortisol are measured to obtain the results. [5] A low dose of dexamethasone suppresses cortisol in individuals with no pathology in endogenous cortisol production.
Dexamethasone is commonly given as a treatment for croup in children. [25] A single dose can reduce the swelling of the airway to improve breathing and reduce discomfort. [25] Dexamethasone is sometimes injected into the heel when treating plantar fasciitis or heel pain, sometimes in conjunction with triamcinolone acetonide. There is no ...
Therefore, if a drug has a bioavailability of 0.8 (or 80%) and it is administered in a dose of 100 mg, the equation will demonstrate the following: De = 0.8 × 100 mg = 80 mg. That is the 100 mg administered represents a blood plasma concentration of 80 mg that has the capacity to have a pharmaceutical effect.
Continuing the maintenance dose for about 4 to 5 half-lives (t 1/2) of the drug will approximate the steady state level. [1] One or more doses higher than the maintenance dose can be given together at the beginning of therapy with a loading dose. [2] A loading dose is most useful for drugs that are eliminated from the body relatively slowly ...
Therefore the dose required to give a certain plasma concentration can be determined if the V D for that drug is known. The V D is not a real volume; it is more a reflection of how a drug will distribute throughout the body depending on several physicochemical properties, e.g. solubility, charge, size, etc.
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50 mg hydrocortisone IV: 25 mg of hydrocortisone every eight hours for 24 hours. Resume usual dose thereafter. Major surgical stress (eg, esophagogastrectomy, total proctocolectomy, open heart surgery) 100 mg hydrocortisone IV: 50 mg every eight hours for 24 hours. Taper dose by half per day to maintenance level.