Axid (nizatidine) is indicated for up to 12 weeks for the treatment of endoscopically diagnosed esophagitis, including erosive and ulcerative esophagitis, and associated heartburn due to GERD.
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Body as a Whole - Serum sickness-like reactions have occurred rarely in conjunction with nizatidine use.
Because elderly patients are more likely to have decreased renal function, care should be taken in dose selection, and it may be useful to monitor renal function ( see DOSAGE AND ADMINISTRATION ). This drug is known to be substantially excreted by the kidney, and the risk of toxic reactions to this drug may be greater in patients with impaired renal function.
Stop using nizatidine and call your doctor at once if you have a serious side effect such as:
capsule, brown, imprinted with 3138, WPI.
brown/white, imprinted with APO, 300.
Prior to treatment, care should be taken to exclude the possibility of malignant gastric ulceration. Active Benign Gastric Ulcer — The recommended oral dosage is 300 mg given either as 150 mg twice daily or 300 mg once daily at bedtime.
The 300-mg Pulvules are imprinted with "300" on the opaque brown cap and "AXID (nizatidine) " and "Reliant" on the opaque pale yellow body, using black ink. They are available as follows:.
A variety of less common events were also reported; it was not possible to determine whether these were caused by nizatidine.
There are, however, no adequate and well-controlled studies in pregnant women. Pregnancy — Teratogenic Effects — Pregnancy Category B — Oral reproduction studies in pregnant rats at doses up to 1500 mg/kg/day (9000 mg/m2/day, 40.5 times the recommended human dose based on body surface area ) and in pregnant rabbits at doses up to 275 mg/kg/day (3245 mg/m2/day, 14.6 times the recommended human dose based on body surface area) have revealed no evidence of impaired fertility or harm to the fetus due to nizatidine. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed.
*Pulvules (filled gelatin capsules, Lilly).
About 60% of an oral dose is excreted as unchanged drug. More than 90% of an oral dose of nizatidine is excreted in the urine within 12 hours. Less than 6% of an administered dose is eliminated in the feces. Renal clearance is about 500 mL/min, which indicates excretion by active tubular secretion.
Pharmacokinetic studies in patients with hepatorenal syndrome have not been done. Part of the dose of nizatidine is metabolized in the liver. In patients with normal renal function and uncomplicated hepatic dysfunction, the disposition of nizatidine is similar to that in normal subjects. 3.
In a 2-generation, perinatal and postnatal fertility study in rats, doses of nizatidine up to 650 mg/kg/day produced no adverse effects on the reproductive performance of parental animals or their progeny.
white/yellow, imprinted with APO, 150.
Effects on Acid Secretion : Axid (nizatidine) significantly inhibited nocturnal gastric acid secretion for up to 12 hours. Antisecretory Activity — 1. Axid (nizatidine) also significantly inhibited gastric acid secretion stimulated by food, caffeine, betazole, and pentagastrin (Table 1).
The rate of hepatic carcinoma in the high-dose animals was within the historical control limits seen for the strain of mice used. The occurrence of a marginal finding at high dose only in animals given an excessive and somewhat hepatotoxic dose, with no evidence of a carcinogenic effect in rats, male mice, and female mice (given up to 360mg/kg/day, about 60 times the human dose), and a negative mutagenicity battery are not considered evidence of a carcinogenic potential for Axid (nizatidine). Carcinogenesis, Mutagenesis, Impairment of Fertility — A 2-year oral carcinogenicity study in rats with doses as high as 500 mg/kg/day (about 80 times the recommended daily therapeutic dose) showed no evidence of a carcinogenic effect. In a 2-year study in mice, there was no evidence of a carcinogenic effect in male mice; although hyperplastic nodules of the liver were increased in the high-dose males as compared with placebo. Female mice given the high dose of Axid (nizatidine) (2,000 mg/kg/day, about 330 times the human dose) showed marginally statistically significant increases in hepatic carcinoma and hepatic nodular hyperplasia with no numerical increase seen in any of the other dose groups. There was a dose-related increase in the density of enterochromaf-fin-like (ECL) cells in the gastric oxyntic mucosa. The female mice were given a dose larger than the maximum tolerated dose, as indicated by excessive (30%) weight decrement as compared with concurrent controls and evidence of mild liver injury (transaminase elevations).
capsule, purple, imprinted with MYLAN 5300.
a. Hormones : Axid (nizatidine) was not shown to affect the serum concentrations of gonadotropins, prolactin, growth hormone, antidiuretic hormone, cortisol, triiodothyronine, thyroxin, testosterone, 5 a -dihydrotestosterone, androstenedione, or estradiol.
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Cardiovascular - In clinical pharmacology studies, short episodes of asymptomatic ventricular tachycardia occurred in 2 individuals administered Axid (nizatidine) and in 3 untreated subjects.
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yellow, imprinted with 150, AXID Reliant.
Axid AR (nizatidine) Tablets Nizatidine 75 mg.
2. Because nizatidine is excreted primarily by the kidney, dosage should be reduced in patients with moderate to severe renal insufficiency ( see DOSAGE AND ADMINISTRATION ).
Maintenance of Healed Duodenal Ulcer — The recommended oral dosage for adults is 150 mg once daily at bedtime.
3. Other Pharmacologic Actions —.
The consequences of continuous therapy with Axid (nizatidine) for longer than 1 year are not known. after healing of an active duodenal ulcer. Axid (nizatidine) is indicated for maintenance therapy for duodenal ulcer patients, at a reduced dosage of 150 mg h.s.
An alternative dosage regimen is 150 mg twice daily. Active Duodenal Ulcer — The recommended oral dosage for adults is 300 mg once daily at bedtime.
Geriatric Use — Of the 955 patients in clinical studies who were treated with nizatidine, 337 (35.3%) were 65 and older. No overall differences in safety or effectiveness were observed between these and younger subjects. Other reported clinical experience has not identified differences in responses between the elderly and younger patients, but greater sensitivity of some older individuals cannot be ruled out.
Among the adverse events in these placebo-controlled trials, anemia (0.2% vs 0%) and urticaria (0.5% vs 0.1%) were significantly more common in the nizatidine group. Placebo-controlled trials in the United States and Canada included over 2,600 patients given nizatidine and over 1,700 given placebo. Worldwide, controlled clinical trials of nizatidine included over 6,000 patients given nizatidine in studies of varying durations.
orange/yellow, imprinted with Lilly 3145, AXID 300 mg.
capsule, purple, imprinted with MYLAN 5150.
Axid (nizatidine) does not inhibit the cytochrome P-450-linked drug-metabolizing enzyme system; therefore, drug interactions mediated by inhibition of hepatic metabolism are not expected to occur. No interactions have been observed between Axid (nizatidine) and theophylline, chlordiazepoxide, lorazepam, lidocaine, phenytoin, and warfarin. In patients given very high doses (3,900 mg) of aspirin daily, increases in serum salicylate levels were seen when nizatidine, 150 mg b.i.d., was administered concurrently.
white/yellow, imprinted with Lilly 3144, AXID 150 mg.
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
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Other - Hyperuricemia unassociated with gout or nephrolithiasis was reported. Eosinophilia, fever, and nausea related to nizatidine administration have been reported.
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b. Axid (nizatidine) had no demonstrable antiandrogenic action.
The USP defines controlled room temperature as: A temperature maintained thermostatically that encompasses the usual and customary working environment of 20° to 25°C (68° to 77°F); that results in a mean kinetic temperature calculated to be not more than 25°C; and that allows for excursions between 15° and 30°C (59° and 86°F) that are experienced in pharmacies, hospitals, and warehouses.
Before initiating therapy, care should be taken to exclude the possibility of malignant gastric ulceration. Axid (nizatidine) is indicated for up to 8 weeks for the treatment of active benign gastric ulcer.
4. Because of the short half-life and rapid clearance of nizatidine, accumulation of the drug would not be expected in individuals with normal renal function who take either 300 mg once daily at bedtime or 150 mg twice daily. The elimination half-life is 1 to 2 hours, plasma clearance is 40 to 60 L/h, and the volume of distribution is 0.8 to 1.5 L/kg. Axid (nizatidine) exhibits dose proportionality over the recommended dose range. Pharmacokinetics — The absolute oral bioavailability of nizati-dine exceeds 70%. Plasma concentrations 12 hours after administration are less than 10 m g/L. Peak plasma concentrations (700 to 1,800 m g/L for a 150-mg dose and 1,400 to 3,600 m g/L for a 300-mg dose) occur from 0.5 to 3 hours following the dose. A concentration of 1,000 m g/L is equivalent to 3 m mol/L; a dose of 300 mg is equivalent to 905 m moles.
Total pepsin output was reduced in proportion to the reduced volume of gastric secretions. Effects on Other Gastrointestinal Secretions — Pepsin: Oral administration of 75 to 300 mg of Axid (nizatidine) did not affect pepsin activity in gastric secretions. 2.
Axid (Nizatidine, USP) is a histamine H 2 -receptor antagonist. Chemically, it is N-[2-[[[2--4-thia-zolyl]methyl]thio]ethyl]-Ni-methyl-2-nitro-1,1-ethenediamine.
Axid (nizatidine) is indicated for up to 8 weeks for the treatment of active duodenal ulcer. In most patients, the ulcer will heal within 4 weeks.
If overdosage occurs, use of activated charcoal, emesis, or lavage should be considered along with clinical monitoring and supportive therapy. The ability of hemodialysis to remove nizatidine from the body has not been conclusively demonstrated; however, due to its large volume of distribution, nizatidine is not expected to be efficiently removed from the body by this method.
Store at controlled room temperature 20° to 25°C (68° to 77°F) in a tightly closed container.
Incidence in Placebo-Controlled Clinical Trials in the United States and Canada - Table 5 lists adverse events that occurred at a frequency of 1% or more among nizatidine-treated patients who participated in placebo-controlled trials. The cited figures provide some basis for estimating the relative contribution of drug and nondrug factors to the side effect incidence rate in the population studied.
Approximay 35% of nizatidine is bound to plasma protein, mainly to a 1-acid glycoprotein. Warfarin, diazepam, acetaminophen, propantheline, phenobarbital, and propranolol did not affect plasma protein binding of nizatidine in vitro.
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CNS - Rare cases of reversible mental confusion have been reported.
Rare cases of cholestatic or mixed hepatocellular and cholestatic injury with jaundice have been reported with reversal of the abnormalities after discontinuation of Axid (nizatidine). All abnormalities were reversible after discontinuation of Axid (nizatidine). In some cases there was marked elevation of SGOT, SGPT enzymes (greater than 500 IU/L) and, in a single instance, SGPT was greater than 2,000 IU/L. Since market introduction, hepatitis and jaundice have been reported. Hepatic - Hepatocellular injury, evidenced by elevated liver enzyme tests ( SGOT, SGPT, or alkaline phosphatase ), occurred in some patients and was possibly or probably related to nizatidine. The overall rate of occurrences of elevated liver enzymes and elevations to 3 times the upper limit of normal, however, did not significantly differ from the rate of liver enzyme abnormalities in placebo-treated patients.
Intrinsic Factor : Oral administration of 75 to 300 mg of Axid (nizatidine) increased betazole-stimulated secretion of intrinsic factor.
Axid (nizatidine) was not mutagenic in a battery of tests performed to evaluate its potential genetic toxicity, including bacterial mutation tests, unscheduled DNA synthesis, sister chromatid exchange, mouse lymphoma assay, chromosome aberration tests, and a micronucleus test.
capsule, white, imprinted with 3137, WPI.
Liberty Corner, NJ 07938, USA Address Medical Inquiries to: Reliant Pharmaceuticals, Inc. March 2005 Distributed by: Reliant Pharmaceuticals, Inc. FDA revision date:12/23/05. Medical Affairs 110 Allen Road Liberty Corner, NJ 07938, USA 2005 Reliant Pharmaceuticals, Inc., 214R400, PRINTED IN U.S.A.
General — 1. Symptomatic response to nizatidine therapy does not preclude the presence of gastric malignancy.
ephone numbers of certified poison control centers are listed in the Physicians' Desk Reference ( PDR ). Treatment — To obtain up-to-date information about the treatment of overdose, a good resource is your certified Regional Poison Control Center. In managing overdosage, consider the possibility of multiple drug overdoses, interaction among drugs, and unusual drug kinetics in your patient.
In humans, less than 7% of an oral dose is metabolized as N2-monodes-methylnizatidine, an H 2 -receptor antagonist, which is the principal metabolite excreted in the urine. Other likely metabolites are the N2-oxide (less than 5% of the dose) and the S-oxide (less than 6% of the dose).
Serum Gastrin : Axid (nizatidine) had no effect on basal serum gastrin. No rebound of gastrin secretion was observed when food was ingested 12 hours after administration of Axid (nizatidine).
Pediatric Use — Safety and effectiveness in pediatric patients have not been established.
Because cross sensitivity in this class of compounds has been observed, H 2 -receptor antagonists, including Axid (nizatidine), should not be administered to patients with a history of hypersensitivity to other H 2 -receptor antagonists. Axid (nizatidine) is contraindicated in patients with known hypersensitivity to the drug.
Gastroesophageal Reflux Disease — The recommended oral dosage in adults for the treatment of erosions, ulcerations, and associated heartburn is 150mg twice daily.
Hypersensitivity - As with other H 2 -receptor antagonists, rare cases of anaphylaxis following administration of nizatidine have been reported. Rare episodes of hypersensitivity reactions (eg, bronchospasm, laryngeal edema, rash, and eosinophilia ) have been reported.
Impotence and decreased libido were reported with similar frequency by patients who received Axid (nizatidine) and by those given placebo. Endocrine - Clinical pharmacology studies and controlled clinical trials showed no evidence of antiandrogenic activity due to Axid (nizatidine). Rare reports of gynecomastia occurred.
capsule, brown/white, imprinted with N 894, 150.
Active Duodenal Ulcer : In multicenter, double-blind, placebo-controlled studies in the United States, endoscopically diagnosed duodenal ulcers healed more rapidly following administration of Axid (nizatidine), 300 mg h.s. or 150 mg b.i.d., than with placebo (Table 2). Clinical Trials — 1. Lower doses, such as 100 mg h.s., had slightly lower effectiveness.
Intravenous median lethal doses in the rat and mouse were 301 mg/kg and 232 mg/kg respectively. Single oral doses of 800 mg/kg in dogs and of 1,200 mg/kg in monkeys were not lethal. Signs and Symptoms — There is little clinical experience with over-dosage of Axid (nizatidine) in humans. Test animals that received large doses of nizatidine have exhibited cholinergic-type effects, including lacrimation, salivation, emesis, miosis, and diarrhea.
Laboratory Tests — False-positive tests for urobilinogen with Multistix may occur during therapy with nizatidine.
The structural formula is as follows: Nizatidine.
Axid (nizatidine) is a competitive, reversible inhibitor of histamine at the histamine H 2 -receptors, particularly those in the gastric parietal cells.
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Nursing Mothers — Studies conducted in lactating women have shown that 0.1% of the administered oral dose of nizatidine is secreted in human milk in proportion to plasma concentrations. Because of the growth depression in pups reared by lactating rats treated with nizatidine, a decision should be made whether to discontinue nursing or discontinue the drug, taking into account the importance of the drug to the mother.
With food, the AUC and C max increase by approximay 10%. The oral bioavailability of nizatidine is unaffected by concomitant ingestion of propantheline. Antacids consisting of aluminum and magnesium hydroxides with simethicone decrease the absorption of nizatidine by about 10%.
Vasculitis has been reported rarely. Rash and exfoliative dermatitis were also reported. Integumental - Sweating and urticaria were reported significantly more frequently in nizatidine- than in placebo-treated patients.
Nizatidine has a bitter taste and mild sulfur-like odor. Each Pulvule( capsule ) contains for oral administration gelatin, pregelatinized starch, dimethicone, starch, titanium dioxide, yellow iron oxide, 150 mg (0.45 mmol) or 300 mg (0.91 mmol) of nizatidine, and other inactive ingredients. Nizatidine has the empirical formula C 12 H 21 representing a molecular weight of 331.47. The 150-mg Pulvule also contains magnesium stearate, and the 300-mg Pulvule also contains croscarmellose sodium, povidone, red iron oxide, and talc. It is an off-white to buff crystalline solid that is soluble in water.
Genitourinary - Reports of impotence have occurred.
Overdoses of Axid (nizatidine) have been reported rarely. The following is provided to serve as a guide should such an overdose be encountered.
Hematologic - Anemia was reported significantly more frequently in nizatidine- than in placebo-treated patients. Fatal thrombocytopenia was reported in a patient who was treated with Axid (nizatidine) and another H 2 -receptor antagonist. Rare cases of thrombocytopenic purpura have been reported. On previous occasions, this patient had experienced thrombocytopenia while taking other drugs.
Dosage Adjustment for Patients With Moderate to Severe Renal Insufficiency — The dose for patients with renal dysfunction should be reduced as follows:
capsule, brown, imprinted with N899, 300.
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To avoid accumulation of the drug in individuals with clinically significant renal impairment, the amount and/or frequency of doses of Axid (nizatidine) should be reduced in proportion to the severity of dysfunction ( see DOSAGE AND ADMINISTRATION ). In individuals who are functionally anephric, the half-life is 3.5 to 11 hours, and the plasma clearance is 7 to 14 L/h. Moderate to severe renal impairment significantly prolongs the half-life and decreases the clearance of nizatidine.
Active Duodenal Ulcer, GERD and Benign Gastric Ulcer.Axid