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www.drugs.com/medical-answers/how-long-does-it-take-zantac-to-work-64837

If you are treating an ulcer, Zantac may take up to 8 weeks for the ulcer to heal. You should notice improvement within 6 weeks. If you are taking Zantac for gastric reflux you should notice improvement within 1 to 2 weeks. If you are taking Zantac for heartburn you should notice improvement within 24 hours. See your doctor if symptoms persist.

www.reference.com/health/long-zantac-work-d02b4c31db9cdf3

Patients using Zantac can take steps to ensure it is effective: The amount of times a patient needs to take Zantac each day varies, so they should follow their physician's instructions. Take the medication regularly. Do not double up on doses when one is missed. To prevent heartburn, take Zantac 30 to 60 minutes before a meal.

www.healthtap.com/topics/how-long-should-you-take-ranitidine

Doctors give trusted answers on uses, effects, side-effects, and cautions: Dr. Krauser on how long should you take ranitidine: 30 minutes.

www.livestrong.com/article/120578-longterm-side-effects-zantac

Zantac acts by blocking the action of histamine at histamine H2-receptors located on the surface of the stomach cells that produce acid. It is available over-the-counter or by prescription. Zantac is generally very safe but may produce side effects with long-term use.

www.webmd.com/drugs/2/drug-4090-7033/zantac-oral/ranitidine-tablet-oral/details

How to use Zantac Tablet. Take this medication by mouth with or without food as directed by your doctor, usually once or twice daily. It may be prescribed 4 times a day for some conditions. If you ...

www.dailystrength.org/.../gerd-heartburn/discussion/help-how-long-does-zantac-take

How long does Zantac take to typically start working? I have been taking 300 mg for two days (today is the third day) and I am not noticing an improvement. I did read online that it takes about 5 -7 days. Is this what others have experienced. I am desperate because of the sore throat I know is being caused by the acid. Thank you.

www.healthline.com/health/ranitidine-oral-tablet

Ranitidine oral tablet is a prescription drug that’s used to treat conditions such as stomach ulcers, gastroesophageal reflux disease (GERD), and conditions where your stomach makes too much acid.

www.everydayhealth.com/drugs/zantac

Take Zantac (ranitidine) exactly as prescribed by your physician. Zantac (ranitidine) can be taken 150mg once to twice a day or 300mg once day. ... There are no known long-term effects on the ...

answersdrive.com/what-are-the-side-effects-of-long-term-use-of-ranitidine-1328471

Ranitidine can be taken with or without food. To prevent heartburn and acid indigestion, take ranitidine 30-60 minutes before eating food or drinking beverages that can cause indigestion. Do not take more than 2 tablets in 24 hours unless directed by your doctor. Follow all directions on the product package.

answers.yahoo.com/question/index?qid=20090801205635AALoBr5

My daughter's pediatrician thinks that my daughter has acid reflux, which I think she's right on. She prescribed her infant Zantac. We started giving it to her yesterday, but I haven't seen any significant change. How long does it take to fully take effect? And, eventually does it take care of the spit up all together or does it just make the spit up less acidic?