Nizatidine is a histamine-2 blocker that works by decreasing the amount of acid produced by the stomach.

Nizatidine is used to treat ulcers in the stomach and intestines. Nizatidine also treats heartburn and erosive esophagitis caused by gastroesophageal reflux disease (GERD), a condition in which acid backs up from the stomach into the esophagus.

Nizatidine may also be used for purposes not listed in this medication guide.

Follow all directions on your medicine label and package. Tell each of your healthcare providers about all your medical conditions, allergies, and all medicines you use.

Use exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.

Take this medicine with a full glass of water.

Nizatidine works best if you take it within 1 hour before you eat or drink anything that may cause you to have heartburn.

Do not take more than 2 tablets in a 24-hour period.

Measure liquid medicine with the dosing syringe provided, or with a special dose-measuring spoon or medicine cup. If you do not have a dose-measuring device, ask your pharmacist for one.

Call your doctor if your heartburn symptoms do not improve after 14 days of treatment, or if you have worsening heartburn.

Nizatidine may be only part of a complete program of treatment that also includes changes in diet or lifestyle habits. Follow your doctor's instructions very closely.

Although most ulcers heal within 4 weeks of nizatidine treatment, it may take up to 8 to 12 weeks of using this medicine before your ulcer heals. For best results, keep using the medication as directed.

Nizatidine can cause unusual results with certain medical tests. Tell any doctor who treats you that you are using nizatidine.

Store at room temperature away from moisture, heat, and light. Keep the bottle tightly closed when not in use.

Usual Adult Dose for Duodenal Ulcer:

300 mg orally once a day at bedtime OR 150 mg orally 2 times a day
Duration of therapy: Up to 8 weeks

Comment: Most patients heal within 4 weeks.

Use: Treatment of active duodenal ulcer

Usual Adult Dose for Duodenal Ulcer Prophylaxis:

150 mg orally once a day at bedtime
Duration of therapy: Up to 1 year

Comment: Efficacy and safety data for the maintenance treatment of duodenal ulcer beyond 1 year are unknown.

Use: Maintenance therapy for duodenal ulcer patients after healing of an active duodenal ulcer

Usual Adult Dose for Gastric Ulcer:

300 mg orally once a day at bedtime OR 150 mg orally 2 times a day
Duration of therapy: Up to 12 weeks

Comment: Malignant gastric ulceration should be excluded prior to starting treatment.

Use: Treatment of active benign gastric ulcer

Usual Adult Dose for Erosive Esophagitis:

150 mg orally 2 times a day
Duration of therapy: Up to 12 weeks

Use: Treatment of endoscopically diagnosed esophagitis (including erosive and ulcerative esophagitis) and associated heartburn due to gastroesophageal reflux disease (GERD)

Usual Adult Dose for Gastroesophageal Reflux Disease:

150 mg orally 2 times a day
Duration of therapy: Up to 12 weeks

Use: Treatment of endoscopically diagnosed esophagitis (including erosive and ulcerative esophagitis) and associated heartburn due to gastroesophageal reflux disease (GERD)

Usual Pediatric Dose for Erosive Esophagitis:

12 years and older: 150 mg orally 2 times a day
-Maximum dose: 300 mg/day
-Duration of therapy: Up to 8 weeks

Use: Treatment of endoscopically diagnosed esophagitis (including erosive and ulcerative esophagitis) and associated heartburn due to GERD

Usual Pediatric Dose for Gastroesophageal Reflux Disease:

12 years and older: 150 mg orally 2 times a day
-Maximum dose: 300 mg/day
-Duration of therapy: Up to 8 weeks

Use: Treatment of endoscopically diagnosed esophagitis (including erosive and ulcerative esophagitis) and associated heartburn due to GERD

Heartburn is often confused with the first symptoms of a heart attack. Seek emergency medical attention if you have chest pain or heavy feeling, pain spreading to the arm or shoulder, nausea, sweating, and a general ill feeling.

You should not use nizatidine if you are allergic to nizatidine or similar stomach medicines such as ranitidine (Zantac), cimetidine (Tagamet), or famotidine (Pepcid).

Ask a doctor or pharmacist if it is safe for you to use this medicine if you have other medical conditions, especially:

• pain when swallowing food;

• bloody or tarry stools, coughing up blood or vomit that looks like coffee grounds;

• heartburn that has lasted for longer than 3 months;

• heartburn that causes you to wheeze or feel like you might pass out;

• unusual weight loss;

• stomach pain, nausea, or vomiting;

• frequent chest pain;

• kidney disease; or

• liver disease.

It is not known whether nizatidine will harm an unborn baby. Do not use this medicine without a doctor's advice if you are pregnant.

Nizatidine can pass into breast milk and may harm a nursing baby. You should not breast-feed while taking this medication.

Do not give this medication to a child younger than 12 years old without the advice of a doctor.

Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

Overdose symptoms may include blurred vision, watery eyes, drooling, nausea, vomiting, or diarrhea.

Keep this medication in the container it came in, tightly closed, and out of reach of children. Store it at room temperature and away from excess heat and moisture (not in the bathroom).

It is important to keep all medication out of sight and reach of children as many containers (such as weekly pill minders and those for eye drops, creams, patches, and inhalers) are not child-resistant and young children can open them easily. To protect young children from poisoning, always lock safety caps and immediately place the medication in a safe location – one that is up and away and out of their sight and reach. http://www.upandaway.org

Unneeded medications should be disposed of in special ways to ensure that pets, children, and other people cannot consume them. However, you should not flush this medication down the toilet. Instead, the best way to dispose of your medication is through a medicine take-back program. Talk to your pharmacist or contact your local garbage/recycling department to learn about take-back programs in your community. See the FDA's Safe Disposal of Medicines website (http://goo.gl/c4Rm4p) for more information if you do not have access to a take-back program.

To help manage your heartburn symptoms, avoid certain things that can make heartburn worse, such as:

• lying down or bending over shortly after eating;

• eating late at night;

• overeating or eating quickly;

• being overweight;

• wearing clothing that is tight around your waist;

• smoking;

• drinking alcohol; or

• eating spicy foods, fried foods, chocolate, caffeine, or acidic fruits or vegetables.

Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Nizatidine may cause serious side effects. Stop using nizatidine and call your doctor at once if you have:

• worsening heartburn;

• chest pain;

• pale skin, feeling light-headed or short of breath; or

• jaundice (yellowing of the skin or eyes).

Common side effects of nizatidine may include:

• headache, dizziness;

• diarrhea; or

• runny or stuffy nose.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Other drugs may interact with nizatidine, including prescription and over-the-counter medicines, vitamins, and herbal products. Tell each of your health care providers about all medicines you use now and any medicine you start or stop using.

Keep all appointments with your doctor.

Do not let anyone else take your medicine. Ask your pharmacist any questions you have about refilling your prescription.

It is important for you to keep a written list of all of the prescription and nonprescription (over-the-counter) medicines you are taking, as well as any products such as vitamins, minerals, or other dietary supplements. You should bring this list with you each time you visit a doctor or if you are admitted to a hospital. It is also important information to carry with you in case of emergencies.