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Prednisone is absorbed in the gastrointestinal tract and has a half-life of 2–3 hours. [37] it has a volume of distribution of 0.4–1 L/kg. [39] The drug is cleared by hepatic metabolism using cytochrome P450 enzymes. Metabolites are excreted in the bile and urine. [39]
Terminal half-life (hours) Cortisol (hydrocortisone) 1 1 8 Cortisone: 0.8 0.8 8 Prednisone: 3.5–5 0.8 16–36 Prednisolone: 4 0.8 16–36 Methylprednisolone: 5–7.5 0.5 18–40 Dexamethasone: 25–80 0 36–54 Betamethasone: 25–30 0 36–54 Triamcinolone: 5 0 12–36 Deflazacort: 6.5 – 1.3 Fludrocortisone acetate: 15 200 24 ...
Absorption half-life 1 h, elimination half-life 12 h. Biological half-life (elimination half-life, pharmacological half-life) is the time taken for concentration of a biological substance (such as a medication) to decrease from its maximum concentration (C max) to half of C max in the blood plasma.
Troleandomycin, ketoconazole, and Clarithromycin inhibit metabolism; and may decrease the rate of elimination and increase the half-life of methylprednisolone. [21] [32] Dosages should be decreased accordingly to avoid side effects. Another CYP 3A4 inhibitor, grapefruit juice, prolongs the half-life of oral methylprednisolone. [32]
In this situation it is generally uncommon to talk about half-life in the first place, but sometimes people will describe the decay in terms of its "first half-life", "second half-life", etc., where the first half-life is defined as the time required for decay from the initial value to 50%, the second half-life is from 50% to 25%, and so on.
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Prednisolone has a relatively short half-life, ranging 2–4 hours. It also has a large therapeutic window, considering the dosage required to produce a therapeutic effect is a few times higher than what the body naturally produces. [14] Prednisolone is 70–90% plasma protein bound, it binds to proteins such as albumin. [14]
Deflazacort's potency is around 70–90% that of prednisone. [8] A 2017 review found its activity of 7.5 mg of deflazacort is approximately equivalent to 25 mg cortisone, 20 mg hydrocortisone, 5 mg of prednisolone or prednisone, 4 mg of methylprednisolone or triamcinolone, or 0.75 mg of betamethasone or dexamethasone.
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related to: half life of prednisone- 109 S High St #100, Columbus, OH · Directions · (614) 224-4261
"The lowest prices on specific drugs" - Family Circle