Disclosed is a tape preparation comprising etodolac in an ionic liquid form, which has high transdermal absorbability. Etodolac is reacted with an organic amine compound to produce an ionic liquid of etodolac. By using the ionic liquid, it becomes possible to increase the transdermal absorbability of etodolac. Further for the purpose of enhancing the transdermal absorbability and the tissue penetration ability of an ionic solution of etodolac, the composition of an organic solvent system for the ionic solution of etodolac is investigated, and it is found that a mixed solvent of an alcohol and an ester (1:2 to 2:1) is suitable as the organic solvent. Still further, an appropriate adhesion force can be achieved by properly selecting a softening agent. In this manner, a tape preparation having good transdermal absorbability can be prepared. The tape preparation can exert its pharmacological efficacy rapidly, and is therefore extremely effective for the teatment of a chronic pain such as rheumatoid arthritis, osteoarthritis and lumbago, an inflammatory diseases such as shoulder periarthritis and tendovaginitis, cervical syndrome, a pain induced by a surgery or an injury, or the like.