Zantac

ADULTS

Active Duodenal Ulcer 
The usual starting dose is 150 milligrams 2 times a day or 10 milliliters (2 teaspoonfuls) 2 times a day. Your doctor also might prescribe 300 milligrams or 20 milliliters (4 teaspoonfuls) once a day, after the evening meal or at bedtime, if necessary for your convenience. The dose should be the lowest effective dose. Long-term use should be reduced to a daily total of 150 milligrams or 10 milliliters (2 teaspoonfuls), taken at bedtime.

Other Excess Acid Conditions (such as Zollinger-Ellison Syndrome)
The usual dose is 150 milligrams or 10 milliliters (2 teaspoonfuls) 2 times a day. This dose can be adjusted upwards by your doctor.

Benign Gastric Ulcer and Gastroesophageal Reflux Disease (GERD)
The usual dose is 150 milligrams or 10 milliliters (2 teaspoonfuls) 2 times a day. Once an ulcer has cleared up, a single bedtime dose is prescribed to maintain healing. Symptoms of GERD generally improve within 24 hours after the start of therapy.

Erosive Esophagitis
The usual dose is 150 milligrams or 10 milliliters (2 teaspoonfuls) 4 times a day. Maintenance dosage is 150 milligrams or 10 milliliters (2 teaspoonfuls) twice a day.

CHILDREN

Duodenal and Gastric Ulcers 
For children 1 month to 16 years of age, the recommended dosage for initial treatment is 2 to 4 milligrams per 2.2 pounds of body weight per day twice daily up to a maximum of 300 milligrams per day. For long-term maintenance of healing, the recommendation is 2 to 4 milligrams per 2.2 pounds of body weight once daily up to a maximum of 150 milligrams per day.

Gastroesophageal Reflux Disease (GERD) and Erosive Esophagitis
For children 1 month to 16 years of age, the usual daily dosage is 5 to 10 milligrams per 2.2 pounds of body weight, divided into two doses.

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