Χώρα: Ηνωμένες Πολιτείες
Γλώσσα: Αγγλικά
Πηγή: NLM (National Library of Medicine)
atenolol (UNII: 50VV3VW0TI) (atenolol - UNII:50VV3VW0TI)
McKesson Contract Packaging
atenolol
atenolol 25 mg
PRESCRIPTION DRUG
Abbreviated New Drug Application
ATENOLOL- ATENOLOL TABLET MCKESSON CONTRACT PACKAGING ---------- ATENOLOL TABLETS, USP DESCRIPTION Atenolol, a synthetic, beta -selective (cardioselective) adrenoreceptor blocking agent, may be chemically described as benzeneacetamide, 4-[2’-hydroxy-3’-[(1-methylethyl)amino]propoxy]-. It has the following structural formula: Atenolol (free base) has a molecular weight of 266.34. It is a relatively polar hydrophilic compound with a water solubility of 26.5 mg/mL at 37°C and a log partition coefficient (octanol/water) of 0.23. It is freely soluble in 1N HCl (300 mg/mL at 25°C) and less soluble in chloroform (3 mg/mL at 25°C). Atenolol is available as 25, 50 or 100 mg tablets for oral administration. Inactive ingredients include colloidal silicon dioxide, magnesium stearate, microcrystalline cellulose, and sodium starch glycolate. CLINICAL PHARMACOLOGY Atenolol is a beta -selective (cardioselective) beta-adrenergic receptor blocking agent without membrane stabilizing or intrinsic sympathomimetic (partial agonist) activities. This preferential effect is not absolute, however, and at higher doses, atenolol inhibits beta -adrenoreceptors, chiefly located in the bronchial and vascular musculature. PHARMACOKINETICS AND METABOLISM In man, absorption of an oral dose is rapid and consistent but incomplete. Approximately 50% of an oral dose is absorbed from the gastrointestinal tract, the remainder being excreted unchanged in the feces. Peak blood levels are reached between two (2) and four (4) hours after ingestion. Unlike propranolol or metoprolol, but like nadolol, atenolol undergoes little or no metabolism by the liver, and the absorbed portion is eliminated primarily by renal excretion. Over 85% of an intravenous dose is excreted in urine within 24 hours compared with approximately 50% for an oral dose. Atenolol also differs from propranolol in that only a small amount (6%-16%) is bound to proteins in the plasma. This kinetic profile results in relatively consistent plasma drug levels with about a fourfold interp Διαβάστε το πλήρες έγγραφο