Therapeutic Agent for Nausea and/or Vomiting

摘要

A therapeutic and/or prophylactic agent for nausea and/or vomiting is provided. A therapeutic and/or prophylactic agent for nausea and/or vomiting, comprising a compound of the Formula (I) or a pharmaceutically acceptable salt or solvate thereof: R1 and R2 are each independently hydrogen or lower alkyl; R3 is hydrogen or lower alkoxycarbonyl; and R4 is hydrogen or lower alkyl; with the proviso that all of R1 to R3 are not simultaneously hydrogen; and R1 and R4 are not simultaneously hydrogen).