Pharmaceutical composition for relieving pain

Abstract

The present invention relates to a pharmaceutical composition for relieving pain in a joint disease, including a hyaluronic acid and a pharmaceutically acceptable carrier, in which the hyaluronic acid is cross-linked by cyclizing a double bond in the moiety of a cinnamic acid in a partially amidated hyaluronic acid represented by Formula (1): [Ar—CH═CH—COO—(CH2)n-NH-]m-HA, to form a cycloubutane ring, in which Ar represents an optionally substituted phenyl group, n represents an integer of 2 or 3, HA represents a carboxy residue of the hyaluronic acid, and m represents an amidation ratio of the hyaluronic acid to the total carboxyl group and is in the range of 3 to 50% relative to the total carboxyl group. The pharmaceutical composition of the present invention is an intra-articular formulation that exerts rapid analgesic effects after administration, and shows extremely long durable effects for a human joint disease with only a single administration rather than multiple administrations of a conventional way.

Dependencies are inferred from the claim text.