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Excipient information presented when available (limited, particularly for generics); consult specific product labeling. [DSC] = Discontinued product
Axid: 300 mg [DSC]
Generic: 150 mg, 300 mg
Axid: 15 mg/mL (480 mL [DSC]) [contains methylparaben, propylparaben, saccharin sodium]
Generic: 15 mg/mL (473 mL [DSC], 480 mL)
Axid AR: 75 mg [DSC]
Brand Names: U.S.
- Axid AR [OTC] [DSC]
- Axid [DSC]
- Histamine H2 Antagonist
Competitive inhibition of histamine at H2-receptors of the gastric parietal cells, which inhibits gastric acid secretion, gastric volume, and hydrogen ion concentration are reduced. Does not affect pepsin secretion, pentagastrin-stimulated intrinsic factor secretion, or serum gastrin.
Vd: 0.8 to 1.5 L/kg
Partially hepatic; forms metabolites
Urine (>90%; ~60% as unchanged drug); feces (<6%)
Time to Peak
Plasma: 0.5 to 3 hours
1 to 2 hours; prolonged with moderate to severe renal impairment
35% to alpha-1 acid glycoprotein
Special Populations: Renal Function Impairment
Moderate to severe renal impairment decreases clearance and prolongs half-life.
Use: Labeled Indications
Duodenal ulcer: Treatment of active duodenal ulcer for up to 8 weeks and maintenance therapy after healing of active ulcer in adults.
Gastric ulcer, benign: Treatment of active benign gastric ulcer for up to 8 weeks in adults.
Gastroesophageal reflux disease: Treatment of endoscopically diagnosed esophagitis, including erosive and ulcerative esophagitis, and associated heartburn due to gastroesophageal reflux disease (GERD) for up to 12 weeks in adults (capsules and oral solution) and up to 8 weeks in children 12 years and older (oral solution only).
Hypersensitivity to nizatidine, other H2 antagonists, or any component of the formulation.
Duodenal ulcer: Oral:
Treatment: 300 mg once daily at bedtime or 150 mg twice daily for up to 8 weeks
Maintenance of healing: 150 mg once daily at bedtime
Gastric ulcer, benign: Oral: 150 mg twice daily or 300 mg once daily at bedtime for up to 8 weeks
GERD: Oral: 150 mg twice daily for up to 12 weeks
Helicobacter pylori eradication (off-label use): Oral: 150 mg twice daily (in combination with amoxicillin and clarithromycin [or bismuth, metronidazole, and tetracycline]) for 10 to 14 days (ACG [Chey 2007]; Graham 2003; Talley 1998).
Use with caution; refer to adult dosing.
Children ≥12 years and Adolescents: (oral solution only): 150 mg twice daily for up to 8 weeks (maximum: 300 mg/day)
Infants 6 months to Children 11 years (off-label use): Limited information available: 5 to 10 mg/kg/day in divided doses given twice daily for up to 8 weeks (Simeone 1997)
Dosing: Renal Impairment
Adults and Pediatrics:
CrCl >50 mL/minute: No dosage adjustment necessary.
CrCl 20 to 50 mL/minute: 150 mg once daily
CrCl <20 mL/minute: 150 mg every other day
CrCl >50 mL/minute: No dosage adjustment necessary
CrCl 20 to 50 mL/minute: 150 mg every other day
CrCl <20 mL/minute: 150 mg every 3 days
Adults (Aronoff 2007):
GFR >50 mL/minute: Administer 75% to 100% of normal dose
GFR 10 to 50 mL/minute: 150 mg every 24 to 48 hours
GFR <10 mL/minute: 150 mg every 48 to 72 hours
Hemodialysis: 150 mg every 48 to 72 hours
Peritoneal dialysis: 150 mg every 48 to 72 hours
Dosing: Hepatic Impairment
There are no dosage adjustments provided in the manufacturer's labeling.
A 2.5 mg/mL oral solution may be made with capsules and one of three different vehicles (lemon-lime Gatorade®, Ocean Spray® Cran-Grape® juice or V8® 100% vegetable juice). Empty the contents of one 300 mg capsule in a mortar. Add small portions of the chosen vehicle and mix to a uniform paste; mix while adding the vehicle in incremental proportions to almost 120 mL; transfer to a calibrated bottle, rinse mortar with vehicle, and add quantity of vehicle sufficient to make 120 mL. Label "shake well". Stable for 2 days refrigerated.Nahata MC, Pai VB, and Hipple TF, Pediatric Drug Formulations, 5th ed, Cincinnati, OH: Harvey Whitney Books Co, 2004.
Administer with or without food.
Store at 20°C to 25°C (68°F to 77°F); excursions permitted to 15°C to 30°C (59°F to 86°F).
Nizatidine is stable for 48 hours at room temperature when the contents of a capsule are mixed in Gatorade® lemon-lime, Cran-Grape® grape-cranberry drink, V8®, or aluminum- and magnesium hydroxide suspension (approximate concentration 2.5 mg/mL) (Lantz 1990)
Atazanavir: H2-Antagonists may decrease the serum concentration of Atazanavir. Management: Specific dose limitations and administration guidelines exist; consult full interaction monograph or atazanavir prescribing information. Consider therapy modification
Bosutinib: H2-Antagonists may decrease the serum concentration of Bosutinib. Management: Administer histamine H2 receptor antagonists more than 2 hours before or after bosutinib. Consider therapy modification
Cefditoren: H2-Antagonists may decrease the serum concentration of Cefditoren. Management: Concomitant use of cefditoren with H2-antagonists and antacids is not recommended. Consider alternative methods to control acid reflux (eg, diet modification) or alternative antimicrobial therapy if use of H2-antagonists can not be avoided. Consider therapy modification
Cefpodoxime: H2-Antagonists may decrease the absorption of Cefpodoxime. Separate oral doses by at least 2 hours. Monitor therapy
Cefuroxime: H2-Antagonists may decrease the absorption of Cefuroxime. Separate oral doses by at least 2 hours. Monitor therapy
Cysteamine (Systemic): H2-Antagonists may diminish the therapeutic effect of Cysteamine (Systemic). Monitor therapy
Dabrafenib: H2-Antagonists may decrease the serum concentration of Dabrafenib. Monitor therapy
Dasatinib: H2-Antagonists may decrease the absorption of Dasatinib. Management: Antacids (taken 2 hours before or after dasatinib administration) can be used in place of H2-antagonists if some acid-reducing therapy is needed. Avoid combination
Delavirdine: H2-Antagonists may decrease the serum concentration of Delavirdine. Management: Chronic therapy with H2-antagonists should be avoided in patients who are being treated with delavirdine. The clinical significance of short-term H2-antagonist therapy with delavirdine is uncertain, but such therapy should be undertaken with caution. Avoid combination
Dexmethylphenidate: H2-Antagonists may increase the absorption of Dexmethylphenidate. Specifically, H2-antagonists may interfere with the normal release of drug from the extended-release capsules (Focalin XR brand), which could result in both increased absorption (early) and decreased delayed absorption. Monitor therapy
Erlotinib: H2-Antagonists may decrease the serum concentration of Erlotinib. Management: Avoid H2-antagonists in patients receiving erlotinib when possible. If concomitant treatment cannot be avoided, erlotinib should be dosed once daily, 10 hours after and at least 2 hours before H2-antagonist dosing. Consider therapy modification
Fosamprenavir: H2-Antagonists may decrease the serum concentration of Fosamprenavir. Cimetidine may also inhibit the metabolism of the active metabolite amprenavir, making its effects on fosamprenavir/amprenavir concentrations difficult to predict. Monitor therapy
Gefitinib: H2-Antagonists may decrease the serum concentration of Gefitinib. Management: Administer gefitinib at least 6 hours before or after administration of a histamine H2-antagonist, and closely monitor clinical response to gefitinib. Consider therapy modification
Indinavir: H2-Antagonists may decrease the serum concentration of Indinavir. Monitor therapy
Iron Salts: H2-Antagonists may decrease the absorption of Iron Salts. Exceptions: Ferric Carboxymaltose; Ferric Citrate; Ferric Gluconate; Ferric Hydroxide Polymaltose Complex; Ferric Pyrophosphate Citrate; Ferumoxytol; Iron Dextran Complex; Iron Sucrose. Monitor therapy
Itraconazole: H2-Antagonists may decrease the serum concentration of Itraconazole. Management: When this combination is used, the itraconazole should be administered with a cola beverage (8 ounces). Itraconazole oral suspension may be less sensitive to this interaction. Monitor patient response to itraconazole closely. Consider therapy modification
Ketoconazole (Systemic): H2-Antagonists may decrease the serum concentration of Ketoconazole (Systemic). Management: Administer oral ketoconazole at least 2 hours prior to use of any H2-receptor antagonist. Monitor patients closely for signs of inadequate clinical response to ketoconazole. Consider therapy modification
Ledipasvir: H2-Antagonists may decrease the serum concentration of Ledipasvir. Consider therapy modification
Mesalamine: H2-Antagonists may diminish the therapeutic effect of Mesalamine. Histamine H2-Antagonist-mediated increases in gastrointestinal pH may cause the premature release of mesalamine from specific sustained-release mesalamine products. Management: Consider avoiding concurrent administration of high-dose histamine H2-receptor antagonists with sustained-release mesalamine products. Consider therapy modification
Methylphenidate: H2-Antagonists may increase the absorption of Methylphenidate. Specifically, H2-antagonists may interfere with the normal release of drug from the extended-release capsules (Ritalin LA brand), which could result in both increased absorption (early) and decreased delayed absorption. Monitor therapy
Multivitamins/Minerals (with ADEK, Folate, Iron): H2-Antagonists may decrease the serum concentration of Multivitamins/Minerals (with ADEK, Folate, Iron). Specifically, the absorption of iron may be impaired by H2-antagonists. Monitor therapy
Nelfinavir: H2-Antagonists may decrease the serum concentration of Nelfinavir. Concentrations of the active M8 metabolite may also be reduced. Monitor therapy
Nilotinib: H2-Antagonists may decrease the serum concentration of Nilotinib. Management: The nilotinib dose should be given 10 hours after or 2 hours before the H2 receptor antagonist in order to minimize the risk of a significant interaction. Consider therapy modification
PAZOPanib: H2-Antagonists may decrease the serum concentration of PAZOPanib. Management: Avoid the use of histamine H2-antagonists in combination with pazopanib. Strategies to minimize the expected interaction between these agents (eg, dose separation) have not been investigated. Avoid combination
Posaconazole: H2-Antagonists may decrease the serum concentration of Posaconazole. Management: Avoid concurrent use of oral suspension with H2-antagonists whenever possible. Monitor patients closely for decreased antifungal effects if this combination is used. Delayed-release posaconazole tablets may be less likely to interact. Consider therapy modification
Rilpivirine: H2-Antagonists may decrease the serum concentration of Rilpivirine. Management: Administer histamine H2 receptor antagonists at least 12 hours before or 4 hours after rilpivirine. Consider therapy modification
Risedronate: H2-Antagonists may increase the serum concentration of Risedronate. This applies specifically to delayed-release risedronate. Avoid combination
Saquinavir: H2-Antagonists may increase the serum concentration of Saquinavir. Monitor therapy
Varenicline: H2-Antagonists may increase the serum concentration of Varenicline. Management: Monitor for increased varenicline adverse effects with concomitant use of cimetidine or other H2-antagonists, particularly in patients with severe renal impairment. International product labeling recommendations vary. Consult appropriate labeling. Monitor therapy
Velpatasvir: H2-Antagonists may decrease the serum concentration of Velpatasvir. Monitor therapy
False-positive for urobilinogen using Multistix
>10%: Central nervous system: Headache (16%)
1% to 10%:
Central nervous system: Anxiety, dizziness, drowsiness, insomnia, irritability (children), nervousness
Dermatologic: Pruritus, skin rash
Gastrointestinal: Abdominal pain, anorexia, constipation, diarrhea, flatulence, heartburn, nausea, vomiting, xerostomia
Respiratory: Cough (children), nasal congestion (children), nasopharyngitis (children)
Miscellaneous: Fever (children)
<1%, postmarketing, and/or case reports: Anaphylaxis, anemia, bronchospasm, confusion, eosinophilia, exfoliative dermatitis, gynecomastia, hepatitis, immune thrombocytopenia, increased serum alkaline phosphatase, increased serum ALT, increased serum AST, jaundice, laryngeal edema, serum sickness-like reaction, thrombocytopenia, vasculitis, ventricular tachycardia
Concerns related to adverse effects:
• Vitamin B12 deficiency: Prolonged treatment (≥2 years) may lead to vitamin B12 malabsorption and subsequent vitamin B12 deficiency. The magnitude of the deficiency is dose-related and the association is stronger in females and those younger in age (<30 years); prevalence is decreased after discontinuation of therapy (Lam 2013).
• Gastric malignancy: Relief of symptoms does not preclude the presence of a gastric malignancy.
• Renal impairment: Use with caution in patients with moderate to severe renal impairment; dosage adjustment recommended.
Concurrent drug therapy issues:
• Drug-drug interactions: Potentially significant interactions may exist, requiring dose or frequency adjustment, additional monitoring, and/or selection of alternative therapy. Consult drug interactions database for more detailed information.
• Pediatric: Use of gastric acid inhibitors, including proton pump inhibitors and H2 blockers, has been associated with an increased risk for development of acute gastroenteritis and community-acquired pneumonia in pediatric patients (Canani 2006).
Pregnancy Risk Factor
Adverse events have not been observed in animal reproduction studies. Nizatidine crosses the placenta (Dicke 1988). Information related to the use of nizatidine in pregnancy is limited; other agents may be preferred (Richter 2005).
• Discuss specific use of drug and side effects with patient as it relates to treatment. (HCAHPS: During this hospital stay, were you given any medicine that you had not taken before? Before giving you any new medicine, how often did hospital staff tell you what the medicine was for? How often did hospital staff describe possible side effects in a way you could understand?)
• Patient may experience dizziness, rhinitis, pharyngitis, vomiting, irritability, cough, headache, or diarrhea. Have patient report immediately to prescriber bruising; bleeding; black, tarry, or bloody stools; or vomiting blood (HCAHPS).
• Educate patient about signs of a significant reaction (eg, wheezing; chest tightness; fever; itching; bad cough; blue skin color; seizures; or swelling of face, lips, tongue, or throat). Note: This is not a comprehensive list of all side effects. Patient should consult prescriber for additional questions.
Intended Use and Disclaimer: Should not be printed and given to patients. This information is intended to serve as a concise initial reference for health care professionals to use when discussing medications with a patient. You must ultimately rely on your own discretion, experience, and judgment in diagnosing, treating, and advising patients.
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- Drug class: H2 antagonists