To secure the good quality of pharmaceutical products, dissolution specifications for Octylonium bromide tablets and Pinaverium bromide tablets are needed to be established, which are enrolled in KPC (Korea Pharmaceutical Codex) with having no appropriate specifications. For establishing dissolution specifications, a number of experiments based on the "Guideline of Dissolution Testing for Solide Oral Dosage Forms" were performed. The results of this study will be used for revising KPC and it is expected to contribute to the incessant production of quality ensured drugs.