Patent ID: 8617614

Claim:
A two to four-week long-acting microsphere, comprising ({5-[2-({[(1E)-phenyl(pyridin-3-yl)methylene]amino}oxy)ethyl]-7,8-dihydronaphthalen-1-yl}oxy)acetic acid or a salt thereof as a drug and a lactic acid/glycolic acid copolymer, wherein (i) an amount of lactic acid/glycolic acid copolymer per part by weight of the drug is from 3 to 10 parts by weight, (ii) the microsphere has an average particle size of from 20 to 50 Î¼m, and (iii) the lactic acid/glycolic acid copolymer has a weight-average molecular weight of from 10,000 to 50,000 and a lactic acid/glycolic acid compositional ratio of from 75/25 to 50/50.