Note 252 — PART III CONTRIBUTIONS FROM THE JOURNAL: PROPRIETARY PRODUCTS (continued 2)
Reading edition
“Free” or elementary iodin (such as the tincture of iodin) is used externally for its local irritant and antiseptic effects. “Combined iodin” (e. g., iodid of potassium), does not produce these effects; and when preparations containing iodin in combined form are used, it is with the expectation of obtaining the systemic (“alterative”) effects such as are produced by iodids.