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The drug was found Post Date: Wed, 15 Oct 2008 12:59:04 +0000 Carbonic anhy-drase has subsequently been found in many sites— including the renal cortex, gastric mucosa, pancreas, eye, and central nervous system (CNS). When sul-fanilamide was introduced as a chemotherapeutic agent, metabolic acidosis was recognized as a side effect. The drug was found to inhibit carbonic an-hydrase in vitro and to inhibit the normal acidifica-tion of the urine in vivo. Autor of the post: Undefined An enormous number of sulfonamides Post Date: Wed, 15 Oct 2008 12:48:20 +0000 Subsequent studies estab-lished the role of carbonic anhydrase in renal transport.Chemistry and Structure-Activity Relationship.An enormous number of sulfonamides have been synthesized and tested for their activity as carbonic anhydrase inhibitors and for their usefulness as diu-retics. Autor of the post: Undefined Excretion is complete within Post Date: Wed, 15 Oct 2008 12:33:53 +0000 Acetazolamide has been studied the most extensively. The other three official drugs of this group are dichlorphenamide, ethoxzolamide, and methazolamide. Excretion is complete within 24 hours. Autor of the post: Undefined Thus, renal and systemic drug Post Date: Wed, 15 Oct 2008 12:23:24 +0000 Acetazolamide is tightly bound to carbonic an-hydrase and, consequently, is present in greater amounts in those tissues in which the enzyme is present in high concentration, particularly the eryth-rocytes and the renal cortex. Some carbonic an-hydrase inhibitors do not penetrate the erythrocyte. Thus, renal and systemic drug actions may be dis-sociated on the basis of drug distribution (see Maren, 1967). Autor of the post: Undefined Preparations and Dosage Post Date: Wed, 15 Oct 2008 12:08:55 +0000 Acetazolamide does not undergo metabolic alteration. Other analogs have been found to be inactive in vitro but active in vivo, as the result of N-dealkylation to form an active metabolite.Preparations and Dosage. Autor of the post: Undefined Vials of ac-etazolamide sodium Post Date: Wed, 15 Oct 2008 11:50:46 +0000 Acetazolamide, USP (DIAMOX), is available as Acetazolamide Tablets, USP, each containing 125 or 250 mg, and as sus-tained-release capsules containing 500 mg. An effec-tive single oral dose is 250 to 500 mg. Vials of ac-etazolamide sodium are available for parenteral administration. Autor of the post: Undefined Dichlorphenamide, USP (DARANIDE), is available Post Date: Wed, 15 Oct 2008 11:37:14 +0000 When used as a diuretic, it should be given once daily or every other day. To achieve a sustained metabolic acidosis, the drug should be given at intervals of 8 hours. Dichlorphenamide, USP (DARANIDE), is available as official 50-mg tablets. Autor of the post: Undefined Ethoxzola-mide, USP (CARDRASE, ETHAMIDE) Post Date: Wed, 15 Oct 2008 11:20:43 +0000 Optimal effects have been achieved with doses of 200 mg per day. Methazolamide, USP (NEPTAZANE), is available as official 50-mg tablets; the usual dose is 100 to 300 mg per day. Ethoxzola-mide, USP (CARDRASE, ETHAMIDE), is available as official 125-mg tablets. Autor of the post: Undefined Serious toxic reactions are in-frequent Post Date: Wed, 15 Oct 2008 11:02:07 +0000 An effective dose appears to vary from 125 to 1000 mg per day, given orally in divided doses.Clinical Toxicity. Serious toxic reactions are in-frequent. Autor of the post: Undefined The mechanism of this reaction Post Date: Wed, 15 Oct 2008 10:49:56 +0000 With large doses, many patients exhibit drowsiness and paresthesias. In hepatic cirrhosis, episodes of disorientation may be induced. The mechanism of this reaction is not clear; it has been postulated that urinary alkalinization diverts ammo-nia of renal origin from the urine into the systemic circulation. 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