Healthcare providers are often asked if drugs can be used past their expiration date. Because of legal restrictions and liability concerns, manufacturers do not sanction such use and usually do not even comment on the safety or effectiveness of their products beyond the date on the label. Since our last publication on this subject, more data have become available.

Even though it is unlikely that people living in the US will be at risk of significant radiation exposure from the nuclear accident in Japan, some readers have suggested a review of the use of potassium iodide (KI) in such circumstances. Potassium iodide taken orally before or at the time of exposure can limit or prevent uptake of radioactive iodine by the thyroid gland.

Healthcare providers are often asked if patients can use drugs after their expiration date. Pharmaceutical companies, because of legal restrictions and liability concerns, will not sanction such use and might not even comment on the safety or effectiveness of using their products beyond the date on the label. Since the last Medical Letter publication on this subject, more data have become available.

Primary hypothyroidism is usually the result of Hashimoto's thyroiditis, thyroidectomy for hyperthyroidism, goiter or cancer, or radioactive iodine therapy for hyperthyroidism.

The drugs of choice for treatment of some fungal infections are listed in the tables. Some of the indications and dosages recommended here have not been approved by the FDA. Other guidelines are available from the Infectious Diseases Society of America (www.idsociety.org).

Potassium iodide (KI) taken orally before or at the time of exposure can limit or prevent uptake of radioactive iodine by the thyroid gland. Children, adolescents and young adults who as children were exposed to even small amounts of radioiodine from the Chernobyl reactor accident have had a marked increase, beginning 4 years after exposure, in the incidence of thyroid nodules and cancer (FDA Guidance Document).

The drugs of choice for treatment of deep fungal infections are listed in the table below. Some of the indications and dosages recommended here have not been approved by the FDA.

The drugs of choice for treatment of deep fungal infections are listed in the table on page 101. Some of the indications and dosages recommended here have not been approved by the US Food and Drug Administration. More detailed guidelines are available from the Infectious Diseases Society of America (J Sobel et al, Clin Infect Dis, volume 30, April 2000).

The incidence of opportunistic fungal infections continues to increase, particularly in patients who have AIDS, are taking immunosuppressive drugs, or are in intensive care units. Intravenous (IV) amphotericin B (Fungizone, and others), sometimes given with flucytosine (Ancobon), is the drug of choice for initial treatment of most rapidly progressive, acutely life-threatening fungal infections; for less severe infections, fluconazole (Diflucan, ketoconazole (Nizoral), or itraconazole (Sporanox - an investigational drug in the (USA) may also be effective, can be taken orally, and are much better tolerated. The treatment of superficial fungal infections is not discussed here.