a coating composition , in both its uncrosslinked and crosslinked forms , for use in delivering a medicament from the surface of a medical device positioned in vivo . once crosslinked , the coating composition provides a gel matrix adapted to contain the medicament in a form that permits the medicament to be released from the matrix in a prolonged , controlled , predictable and effective manner in vivo . a composition includes a polyether monomer , such as an alkoxy poly , a carboxylic acid - containing monomer , such as acrylic acid , a photoderivatized monomer , and a hydrophilic monomer such as acrylamide .