Do not take more than 2 tablets in 24 hours unless directed by your doctor. Follow all directions on the product package. If you have any questions, ask your doctor or pharmacist. Stop taking this medication and call your doctor promptly if your symptoms continue after you begin taking it, or if they do not improve after you have been taking this medication for 14 days in a row. Do not take this medication for more than 14 days in a row without talking with your doctor.
Headache, constipation or diarrhea may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including:. This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
Call your doctor for medical advice about side effects. In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at Before taking ranitidine, tell your doctor or pharmacist if you are allergic to it; or to other H2 blockers e. This product may contain inactive ingredients, which can cause allergic reactions or other problems.
Talk to your pharmacist for more details. Before using this medication, tell your doctor or pharmacist your medical history, especially of:. Some symptoms may actually be signs of a more serious condition. Get medical help right away if you have:. In addition, before you self-treat with this medication, get medical help right away if you have any of these signs of a serious condition:.
During pregnancy, this medication should only be used if clearly needed. Discuss the risks and benefits with your doctor.
Tell your doctor if you are pregnant before using this medication. Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Do not start, stop, or change the dosage of any medicines without your doctor's approval. Some products need stomach acid so that the body can absorb them properly. Ranitidine decreases stomach acid, so it may change how well these products work.
Some affected products include atazanavir, dasatinib, delavirdine, certain azole antifungals such as itraconazole, ketoconazole , pazopanib, among others. Do not use this medication with other products that contain ranitidine or other H2 blockers cimetidine, famotidine, nizatidine. This medication may interfere with certain laboratory tests including certain urine protein tests , possibly causing false test results.
Make sure laboratory personnel and all your doctors know you use this drug. If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call Otherwise, call a poison control center right away.
US residents can call their local poison control center at Canada residents can call a provincial poison control center. Lifestyle changes such as stress reduction programs, stopping smoking, limiting alcohol, and diet changes such as avoiding caffeine and certain spices may help this medication work better.
Talk to your doctor or pharmacist about lifestyle changes that might benefit you. Different brands of this medication have different storage needs. Check the product package for instructions on how to store your brand, or ask your pharmacist. Do not store in the bathroom. Keep all medications away from children and pets. The recommended adult dose of ranitidine ranges from mg daily to mg twice daily or mg once daily depending on the condition being treated. Ranitidine may be taken with or without food.
When used over-the-counter to treat acid indigestion, heartburn, or sour or upset stomach, the usual dose for adults and children 16 years of age or older is 75 mg to mg taken when symptoms appear.
If symptoms persist for more than 1 hour or return after 1 hour, you may take a second dose of the same strength. To prevent symptoms brought on by consuming food or beverages, take the dose 30 to 60 minutes before eating food or drinking beverages that are expected to cause symptoms.
The maximum dose is mg every 24 hours. Do not take it in this manner for more than 2 weeks without seeking medical advice. Injection: The injectable form of ranitidine may be used in hospitals under specific circumstances when the patient is not able to swallow tablets. The usual dose of ranitidine injection is 50 mg every 6 to 8 hours given intravenously into a vein or intramuscularly into a muscle.
If you are using the oral liquid form of ranitidine, use an oral syringe to measure each dose of the liquid, as it gives a more accurate measurement than household teaspoons. Many things can affect the dose of medication that a person needs, such as body weight, other medical conditions, and other medications.
If your doctor has recommended a dose different from the ones listed here, do not change the way that you are taking the medication without consulting your doctor.
It is important to take this medication exactly as prescribed by your doctor. If you miss a dose, take it as soon as possible and continue with your regular schedule. If it is almost time for your next dose, skip the missed dose and continue with your regular dosing schedule.
Do not take a double dose to make up for a missed one. If you are not sure what to do after missing a dose, contact your doctor or pharmacist for advice.
Store the tablets at room temperature, protect them from light and moisture, and keep them out of the reach of children. Protect it from light, and do not allow it to freeze. Keep it out of the reach of children. Do not dispose of medications in wastewater e. Ask your pharmacist how to dispose of medications that are no longer needed or have expired. Many medications can cause side effects.
A side effect is an unwanted response to a medication when it is taken in normal doses. Side effects can be mild or severe, temporary or permanent. The side effects listed below are not experienced by everyone who takes this medication. If you are concerned about side effects, discuss the risks and benefits of this medication with your doctor.
Many of these side effects can be managed, and some may go away on their own over time. Contact your doctor if you experience these side effects and they are severe or bothersome. Your pharmacist may be able to advise you on managing side effects. Although most of these side effects listed below don't happen very often, they could lead to serious problems if you do not seek medical attention.
Stop taking the medication and seek immediate medical attention if any of the following occur:. Some people may experience side effects other than those listed. Check with your doctor if you notice any symptom that worries you while you are taking this medication. Before you begin using a medication, be sure to inform your doctor of any medical conditions or allergies you may have, any medications you are taking, whether you are pregnant or breast-feeding, and any other significant facts about your health.
These factors may affect how you should use this medication. Kidney function: Kidney disease or reduced kidney function may cause this medication to build up in the body, causing side effects. If you have reduced kidney function or kidney disease, discuss with your doctor how this medication may affect your medical condition, how your medical condition may affect the dosing and effectiveness of this medication, and whether any special monitoring is needed.
Pneumonia: People with lung disease, a weak immune system, or diabetes may be at an increased risk of developing pneumonia while taking ranitidine. If you have any of these conditions, discuss with your doctor how this medication may affect your medical condition, how your medical condition may affect the dosing and effectiveness of this medication, and whether any special monitoring is needed.
Porphyria: Ranitidine may cause attacks of a condition called acute porphyria a disorder that affects the production of heme in the body. People with a history of acute porphyria should not take ranitidine. Stomach cancer: Using medications such as ranitidine may prevent symptoms of stomach cancer from being noticed. If you have recurrent vomiting, difficulty swallowing, blood in the stool, significant unintentional weight loss, fatigue anemia , or are coughing up blood, check with your doctor right away.
If you have heartburn that worsens or returns after using this medication continuously for 2 weeks, check with your doctor. Pregnancy: This medication should not be used during pregnancy unless the benefits outweigh the risks.
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