Acetohydroxamic Acid (Lithostat)

Trade Name : Lithostat

Mission Pharmacal Company

TABLET

Strength 250 mg/1

ACETOHYDROXAMIC ACID Urease Inhibitor [EPC],Urease Inhibitors [MoA]

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GNH India is WHO GDP and ISO 9001 2015 Certified Pharmaceutical Wholesaler/ Supplier/ Exporters/ Importer from India of Acetohydroxamic Acid (Lithostat) which is also known as Lithostat and Manufactured by Mission Pharmacal Company. It is available in strength of 250 mg/1 per ml. Read more

Acetohydroxamic Acid (Lithostat) is supplied for Tenders/ Emergency imports/ Un - licensed, Specials, Orphan drug/ Name patient line/ RLD supplies/ Reference listed drugs/ Comparator Drug/ Bio-Similar/ Innovator samples For Clinical trials. Click to know price. Read less

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Acetohydroxamic acid (AHA) is a stable, synthetic compound derived from hydroxylamine and ethyl acetate. Its molecular structure is similar to urea:
AHA is weakly acidic, highly soluble in water, and chelates metals - notably iron. The molecular weight is 75.068. AHA has a pKa of 9.32 and a melting point of 89-91u00b0 C. AHA is a urease inhibitor. Available as 250 mg tablets.

AHA reversibly inhibits the bacterial enzyme urease, thereby inhibiting the hydrolysis of urea and production of ammonia in urine infected with urea-splitting organisms. The reduced ammonia levels and decreased pH enhance the effectiveness of antimicrobial agents and allow an increased cure rate of these infections.
AHA is well absorbed from the gastrointestinal tract after oral administration; peak blood levels occur from 0.25 to 1 hour after dosing. The compound is distributed throughout body water, and there is no known binding to any tissue. AHA chelates with dietary iron within the gut. This reaction may interfere with absorption of AHA and with iron. Concomitant hypochromic anemia should be treated with intramuscular iron.
In rodents, the metabolic fate of AHA is well known; 55% is excreted unchanged in urine, 25% is excreted as acetamide or acetate and 7% is excreted by the lungs as carbon dioxide. Less than 1% is excreted in the feces. Approximately 5% of the administered dose is unaccounted for. In rodents, AHA shows a dose-related change in pharmacokinetics; with increasing dose, there is an increase in the half-life and an increase in the percent of the administered dose recovered in urine as unchanged AHA.
Pharmacokinetics in man are generally similar to rodents including the dose-related increase in half-life, but they are not as well characterized as in the rodent. Thirty-six to sixty-five percent (36-65%) of the oral dosage is excreted unchanged in the urine. It is unaltered AHA in the urine that provides the therapeutic effect, but the precise concentration of AHA in urine that is necessary to inhibit urease is incompletely delineated. Therapeutic benefit may be obtained from concentrations as low as 8 mcg/ml; higher concentrations (i.e., 30 mcg/ml) are expected to provide more complete inhibition of urease. The plasma half-life of AHA is approximately 5-10 hours in subjects with normal renal function and is prolonged in patients with reduced renal function.
Acetohydroxamic acid has been evaluated clinically in patients with urea-splitting urinary infections, often accompanied by struvite stone disease, that were recalcitrant to other forms of medical and surgical management. In these clinical trials, AHA reduced the pathologically elevated urinary ammonia and pH levels that result from the hydrolysis of urea by the enzyme, urease.
AHA does not acidify urine directly nor does it have a direct antibacterial effect. The usefulness of reducing ammonia levels and decreasing urinary pH is suggested by single (not yet replicated) clinical trials in which urease inhibition 1) allowed successful antibiotic treatment of urea-splitting Proteus infections after surgical removal of struvite stones in patients not cured by 3 months of antibacterial treatment alone, and 2) reduced the rate of stone growth in patients who were not candidates for surgical removal of stones.

Acetohydroxamic acid is indicated as adjunctive therapy in patients with chronic urea-splitting urinary infection. AHA is intended to decrease urinary ammonia and alkalinity, but it should not be used in lieu of curative surgical treatment (for patients with stones) or antimicrobial treatment. Long-term treatment with AHA may be warranted to maintain urease inhibition as long as urea-splitting infection is present. Experience with AHA does not go beyond 7 years. A patient package insert should be distributed to each patient who receives AHA.

Acetohydroxamic acid should not be used in:
Acetohydroxamic acid may cause fetal harm when administered to a pregnant woman. AHA was teratogenic (retarded and/or clubbed rear leg at 750 mg/kg and above and exencephaly and encephalocele at 1,500 mg/kg) when given intraperitoneally to rats. AHA is contraindicated in women who are or may become pregnant. If this drug is used during pregnancy, or if the patient becomes pregnant while taking this drug, the patient should be informed of the potential hazard to the fetus.

A Coombs negative hemolytic anemia has occurred in patients receiving AHA. Gastrointestinal upset characterized by nausea, vomiting, anorexia and generalized malaise have accompanied the most severe forms of hemolytic anemia. Approximately 15% of patients receiving AHA have had only laboratory findings of an anemia. However, most patients developed a mild reticulocytosis. The untoward reactions have reverted to normal following cessation of treatment. A complete blood count, including a reticulocyte count, is recommended after two weeks of treatment. If the reticulocyte count exceeds 6%, a reduced dosage should be entertained. A CBC and reticulocyte count are recommended at 3-month intervals for the duration of treatment.

Hematologic Effects: Bone marrow depression (leukopenia, anemia, and thrombocytopenia) has occurred in experimental animals receiving large doses of AHA, but has not been seen in man to date. AHA is a known inhibitor of DNA synthesis and also chelates metals - notably iron. Its bone marrow suppressant effect is probably related to its ability to inhibit DNA synthesis, but anemia could also be related to depletion of iron stores. To date, the only clinical effect noted has been hemolysis, with a decrease in the circulating red blood cells, hemoglobin and hematocrit. Abnormalities in platelet or white blood cell count have not been noted. However, clinical monitoring of the platelet and white cell count is recommended.
Monitoring Liver Function: Abnormalities of liver function have not been reported to date. However, a chloro-benzene derivative of acetohydroxamic acid caused significant liver dysfunction in an unrelated study. Therefore, close monitoring of liver function is recommended. (See Carcinogenesis for discussion of possible hepatic carcinogenesis.)
Use In Patients With Renal Impairment: Since AHA is eliminated primarily by the kidneys, patients with significantly impaired renal function should be closely monitored, and a reduction of daily dose may be needed to avoid excessive drug accumulation. (See Dosage and Administration.)

AHA has been used concomitantly with insulin, oral and parenteral antibiotics, and progestational agents. No clinically significant interactions have been noted, but until wider clinical experience is obtained, AHA should be used with caution in patients receiving other therapeutic agents.
AHA taken in association with alcoholic beverages has resulted in a rash. (See Adverse Reactions.)
AHA chelates heavy metals-notably iron. The absorption of iron and AHA from the intestinal lumen may be reduced when both drugs are taken concomitantly. When iron administration is indicated, intramuscular iron is probably the product of choice.

Well controlled, long-term animal studies that identify the carcinogenic potential of AHA treatment have not been conducted. Acetamide, a metabolite of AHA, has been shown to cause hepatocellular carcinoma in rats at oral doses 1,500 times the human dose. AHA is cytotoxic and was positive for mutagenicity in the Ames test.

Pregnancy Category X. (See Contraindications.)

It is not known whether AHA is secreted in human milk. Because many drugs are excreted in human milk, and because of the potential for serious adverse reactions in nursing infants from AHA, a decision should be made to discontinue nursing or the drug, taking into account the significance of the drug to the motheru2019s well being.

Children with chronic, recalcitrant, urea-splitting urinary infection may benefit from treatment with AHA. However, detailed studies involving dosage and dose intervals in children have not been established. Children have tolerated a dose of 10 mg/kg/day, taken in two or three divided doses, satisfactorily for periods up to one year. Close monitoring of such patients is mandatory.

Experience with AHA is limited. About 150 patients have been treated, most for periods of more than a year.
Adverse reactions have occurred in up to thirty percent (30%) of the patients receiving AHA. In some instances the reactions were symptomatic; in others only changes in laboratory parameters were noted. Adverse reactions seem to be more prevalent in patients with preexisting thrombophlebitis or phlebothrombosis and/or in patients with advanced degrees of renal insufficiency. The risk of adverse reactions is highest during the first year of treatment. Chronic treatment does not seem to increase the risk nor the severity of adverse reactions.
The following reactions have been reported:
NEUROLOGICAL: Mild headaches are commonly reported (about 30%) during the first 48 hours of treatment. These headaches are mild, responsive to oral salicylate-type analgesics, and usually disappear spontaneously. The headaches have not been associated with vertigo, tinnitus, or visual or auditory abnormalities. Tremulousness and nervousness have also been reported.
GASTROINTESTINAL: Gastrointestinal symptoms, nausea, vomiting, anorexia, and malaise have occurred in 20-25% of patients. In most patients the symptoms were mild, transitory, and did not result in interruption of treatment. Approximately 3% of patients developed a hemolytic anemia of sufficient magnitude to warrant interruption in treatment; several of these patients also had symptoms of gastrointestinal upset.
HEMATOLOGICAL: Approximately 15% of patients have had laboratory findings characteristic of a hemolytic anemia. A mild reticulocytosis (5- 6%) without anemia, is even more prevalent. The laboratory findings are occasionally accompanied by systemic symptoms such as malaise, lethargy and fatigue, and gastrointestinal symptoms. Symptoms and laboratory findings have invariably improved following cessation of treatment with AHA. The hematological abnormalities are more prevalent in patients with advanced renal failure.
DERMATOLOGICAL: A nonpruritic, macular skin rash has occurred in the upper extremities and on the face of several patients taking AHA on a long-term basis, usually when AHA has been taken concomitantly with alcoholic beverages, but in a few patients in the absence of alcohol consumption. The rash commonly appears 30-45 minutes after ingestion of alcoholic beverages; it characteristically disappears spontaneously in 30-60 minutes. The rash may be associated with a general sensation of warmth. In some patients the rash is sufficiently severe to warrant discontinuation of treatment, but most patients have continued treatment, avoiding alcohol or using smaller quantities of it. Alopecia has also been reported in patients taking AHA.
CARDIOVASCULAR: Superficial phlebitis involving the lower extremities has occurred in several patients on AHA during the early (Phase II) clinical trials. Several of the affected patients had had phlebitic episodes prior to treatment. One patient developed deep vein thrombosis of the lower extremities. The patient with phlebothrombosis had an associated traumatic injury to the groin. It is unclear whether the phlebitis was related to or exacerbated by treatment with AHA. No patient in the three (3) year controlled (Phase III) clinical trial developed phlebitis. In all instances these vascular abnormalities returned to normal following appropriate medical therapy. Embolic phenomena have been reported in three patients taking AHA in the Phase II trial. The phlebitis and emboli resolved following discontinuation of AHA and implementation of appropriate medical therapy. Several patients have resumed treatment with AHA without ill effect. Palpitations have also been reported in patients taking AHA.
RESPIRATORY: No symptoms have been reported. Radiographic evidence of small pulmonary emboli has been seen in three patients with phlebitis in their lower legs.
PSYCHIATRIC: Depression, anxiety, nervousness, and tremulousness have been observed in approximately 20% of patients taking AHA. In most patients the symptoms were mild and transitory, but in about 6% of patients the symptoms were sufficiently distressing to warrant interruption or discontinuation of treatment.

Acute deliberate overdosage in man has not occurred, but would be expected to induce the following symptoms: anorexia, malaise, lethargy, diminished sense of well being, tremulousness, anxiety, nausea and vomiting. Laboratory findings are likely to include an elevated reticulocyte count and a severe hemolytic reaction requiring hospitalization, symptomatic treatment, and possibly blood transfusions. Concomitant reduction in platelets and/or white blood cells should be anticipated.
Milder overdosages resulting in hemolysis have occurred in an occasional patient with reduced renal function after several weeks or months of continuous treatment.
The acute LD 50 of AHA in animals (rats) is 4.8 gm/kg.
Recommended treatment for an overdosage reaction consists of (1) cessation of treatment, (2) close monitoring of hematologic status, (3) symptomatic treatment, and (4) blood transfusions as required by the clinical circumstances. The drug is probably dialyzable, but this property has not been tested clinically.

AHA should be administered orally, one tablet 3-4 times a day in a total daily dose of 10-15 mg/kg/day. The recommended starting dose is 12 mg/kg/day, administered at 6-8 hour intervals at a time when the stomach is empty. The maximum daily dose should be no more than 1.5 grams, regardless of body weight.
The dosage should be reduced in patients with reduced renal function. Patients whose serum creatinine is greater than 1.8 mg/dl should take no more than 1.0 gm/day; such patients should be dosed at q-12-h intervals. Further reductions in dosage to prevent the accumulation of toxic concentrations in the blood may also be desirable. Insufficient data exists to accurately characterize the optimum dose and/or dose interval in patients with moderate degrees of renal insufficiency.
Patients with advanced renal insufficiency (i.e., serum creatinine more than 2.5 mg/dl) should not be treated with AHA. The risk of accumulation of toxic blood levels of AHA seems to be greater than the chances for a beneficial effect in such patients.
In children an initial dose of 10 mg/kg/day is recommended. Close monitoring of the patientu2019s clinical condition and hematologic status is recommended. Titration of the dose to higher or lower levels may be required to obtain an optimum therapeutic effect and/or to reduce the risk of side effects.

LITHOSTATn n n , NDC 0178-0500-01, is available for oral administration as 250 mg white, round tablets, in unit of use packages of 100 tablets. Each LITHOSTATn n n tablet is debossed MPC 500 on one side and blank on the other side. LITHOSTATn n n should be stored in a dry place at room temperature, 15u00b0 - 30u00b0C (59u00b0 - 86u00b0F). Container should be closed tightly.n nn
C08 Rev 010060

PLEASE READ THIS INFORMATION BEFORE USING THIS DRUG.
GENERAL INFORMATION:
In some instances stones may form initially as a result of non-infectious (i.e., metabolic) causes. If a metabolic stone becomes infected, then an u201cinfection stoneu201d may grow onto the u201cmetabolic stone.u201d Stone analysis and/or biochemical tests will usually determine which factors are present.
Experimental investigations have identified an enzyme called urease which is made by some (but not all) bacteria. Urease reacts with urine to make ammonia. Ammonia changes the acidity of the urine and the change in acidity encourages stone formation. LITHOSTATn n n (acetohydroxamic acid) inhibits urease and thereby reduces urinary ammonia. In some instances, LITHOSTATn n n enhances the effectiveness of antibiotics and thereby makes urinary infection easier to control.n n n n LITHOSTATn n n is a drug which prevents the excessive buildup of ammonia in your urine, which controls the acidity and alkalinity (pH) of your urine. The cause of excessive ammonia and alkalinity in your urine is a bacterial infection.n nn
WHAT CAN LITHOSTATn n n DO?n n n
LITHOSTATn n n should not be used in place of surgical treatment. Surgical removal of all stones and elimination of all infection with antibiotics offers the possibility of curative treatment. LITHOSTATn n n is likely to be more effective after large stones or obstructing stones have been removed.n nn
WHAT ARE THE PROBLEMS OR SIDE EFFECTS WITH LITHOSTATn n n ?n n n
Problems related to LITHOSTATn n n have disappeared following cessation of the drug and initiation of appropriate medical treatment. Most patients have resumed treatment without ill effect.n nn
A flushing skin reaction (i.e., redness, warmth, and tingling) has occurred in several patients who consumed alcohol during treatment with LITHOSTATn n n . The reaction persisted approximately 30 minutes and disappeared without treatment. The cause and significance of this reaction are unknown. Consequently, patients are encouraged to abstain from consumption of alcoholic beverages while being treated with LITHOSTATn n n .n nn
In animal studies doses of LITHOSTATn n n about 20 times the maximum human dose have caused fetal abnormalities (birth defects) indicating a potential for such an adverse effect in an exposed human fetus. Therefore, LITHOSTATn n n should not be given to pregnant women or to any sexually active woman of child-baring age, not using a highly effective method of contraception (oral contraceptive or IUD).n nn
An acceptable long-term study of the cancer causing potential of LITHOSTATn n n has not been conducted, but a known metabolite of LITHOSTATn n n , acetamide, is carcinogenic (cancer-causing) to the liver in rats at doses about 80 times the maximum human dose of LITHOSTATn n n . LITHOSTATn n n thus must be considered a potential human carcinogen. LITHOSTATn n n kills tissue cells grown in tissue culture and alters genetic material in cells grown in culture.n nn
LITHOSTATn n n may induce other adverse reactions which have not yet been recognized.n nn
Unusual symptoms should be reported to your physician. Mild symptoms usually do not warrant discontinuation of treatment. Severe symptoms may necessitate temporary cessation of treatment and/or alteration of dosage.
WHAT ABOUT TAKING OTHER DRUGS WITH LITHOSTATn n n ?n n n
LITHOSTATn n n reacts with iron, and may not be absorbed into the bloodstream. Both the iron you take and the LITHOSTATn n n you take may be ineffective if both drugs are taken together.n nn
HOW IMPORTANT IS MY DAILY DOSAGE OF LITHOSTATu00ae?
IN CONCLUSION:
C08 Rev 010060
MISSION PHARMACAL COMPANY, San Antonio, TX 78230 1355

Lithostat 250mg Labeln n n NDC: 0178-0500-01n nn

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Acetohydroxamic Acid (Lithostat)

Trade Name : Lithostat

TABLET

Delivery Process

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Trade Marks displayed in compliance with provisions of: Trademark Act, 1999 u/s 30 and 30 (1) of "Fair use"

Packaging and Delivery

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Acetohydroxamic Acid (Lithostat)

Trade Name : Lithostat

TABLET

Delivery Process

Product information is meant for

Disclaimer

Trade Marks displayed in compliance with provisions of: Trademark Act, 1999 u/s 30 and 30 (1) of "Fair use"

Packaging and Delivery

About GNH

Similar Products

Desogestrel And Ethinyl Estradiol (Emoquette)

Diphenoxylate Hydrochloride And Atropine Sulfate (Diphenoxylate Hydrochloride And Atropine Sulfate)

Fluoxetine Hydrochloride (Fluoxetine)

Metoprolol Succinate (Metoprolol Succinate)

Losartan Potassium (Losartan Potassium)

Browse Our Services And Processes

Disclaimer

Browse from other international pharmaceuticals

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Canadian DIN

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