ANALGESICS

摘要

Analgesics which contain as the active ingredient pyrazolo[1,5-a]pyrimidine derivatives represented by general formula (1), etc., have an analgetic action and thus are useful in relieving symptoms with pain such as postoperative pain, wherein R<11> represents hydrogen, lower alkyl, pyridyl, furyl, thienyl, phenyl optionally having lower alkyl or phenylthio as substituent(s), N-(lower alkyl)pyrolyl, or pyrazinyl; R<12> represents hydrogen, halogeno, phenyl, phenyl having substituent(s) selected from among halogeno, phenylthio and trifluoromethyl, phenyl having trifluoromethyl and nitro as substituents, or phenyl having lower alkoxy and phenylthio as substituents; R<13> represents hydrogen, lower alkyl optionally having oxo, ethylenedioxy, lower alkanoyloxy, lower alkoxy, lower alkylthio, carboxy, halogeno or thienyl as substituent(s), lower alkenyl, cycloakyl, phenyl optionally having one to three substituents selected from among lower alkyl, halogeno and lower alkoxy, furyl, or thienyl; R<14> represents hydrogen, carboxy, lower alkoxycarbonyl, nitro, halogeno, or lower alkyl having lower alkoxycarbonyl or an alkali metal carboxylate residue as substituent(s), or alternatively R<13> and R<14> may be bonded to each other to thereby form lower alkylene; R<15> represents hydrogen, alkali metal, lower alkyl, phenyl optionally having one to three substituents selected from among lower alkyl and lower alkoxy, pyridyl optionally having lower alkyl or halogeno as substituent(s), quinolyl or isoquinolyl; and A represents a single bond or lower alkylene.