At times when patients have a malignant pleural effusion or a pneumothorax, one wishes to eliminate the pleural space by pleurodesis. This article describes results from attempting pleurodesis with silver nitrate, iodopovidone (betadine), transforming growth factor beta (TGFβ), OK432, and lipoteichoic acid-T. The two most promising agents seem to be silver nitrate and iodopovidone. Both agents induce pleurodesis that is at least comparable with that produced by talc, and neither induced the acute respiratory distress syndrome that sometimes occurs after intrapleural administration of talc.