Zantac is the brand name of the generic compound Ranitidine. Generally, a 150 mg ranitidine tablet has a elimination half-life of 2.5 - 3 hours. The elimination half-life in both IV and IM (50 mg dose) are around 2 - 2.3 hours. However, the elimination half-life can prolong (around 4 - 6 hours) in patients with renal dysfunction.
i started taking zantac for stomach pain. how long before i know if it is working?
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Two days
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