Opiranserin (INNTooltip International Nonproprietary Name; developmental code name VVZ-149) is a selective and combined glycine GlyT2 transporter blocker (IC₅₀Tooltip Half-maximal inhibitory concentration = 0.86 μM), purine P2X₃ receptor antagonist (IC₅₀ = 0.87 μM), and serotonin 5-HT_2A receptor antagonist (IC₅₀Tooltip Half-maximal inhibitory concentration = 1.3 μM) which is under development by Vivozon for the intravenous treatment of postoperative pain. As of April 2017, it is in phase II clinical trials for this indication. The INNTooltip International Nonproprietary Name of the drug was issued in 2017. Approved for post-operative pain management in South Korea in December of 2024.