Infumorph is only indicated for intrathecal or epidural administration; it is not for single-dose IV, IM, . Morphine/Morphine Sulfate/MSIR Oral Tab: 15mg, 30mg . Subcutaneous tissue can absorb up to 3 mL/hour. .. Inject 2.5 to 15 mg directly into a vein or into the tubing of a freely flowing IV...