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Tramadol, sold under the brand name Ultram among others, [1] is an opioid pain medication and a serotonin–norepinephrine reuptake inhibitor (SNRI) used to treat moderately severe pain. [3] [13] When taken by mouth in an immediate-release formulation, the onset of pain relief usually begins within an hour. [3] obat ranitidine hcl 150 mg