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

Propafenone (Rythmol - Knoll), a class IC antiarrhythmic drug used in Europe for treatment of various arrhythmias for more than 10 years, was recently marketed in the USA for oral treatment of life-threatening ventricular arrhythmias such as sustained ventricular tachycardia. This restrictive labeling reflects concerns arising from the interim report of the Cardiac Arrhythmia Suppression Trial, in which post-myocardial infarction patients with asymptomatic or mildly symptomatic ventricular arrhythmias treated with the class IC antiarrhythmic drugs encainide (Enkaid) or flecainide...

Rifabutin (formerly ansamycin; Mycobutin - Adria), a rifamycin antibiotic similar to rifampin (Rifadin, Rimactane) was recently approved by the US Food and Drug Administration for prevention of disseminated Mycobacterium avium complex (MAC) disease in patients with advanced HIV infection.

The US Food and Drug Administration has approved the marketing of 5% doxepin hydrochloride cream (Zonalon - GenDerm) for treatment of pruritus due to eczematous dermatoses. Oral doxepin is used as a tricyclic antidepressant (Sinequan, and others).

Dexfenfluramine (Redux - Wyeth-Ayerst) has been approved by the US Food and Drug Administration as an aid to diet for treatment of obesity and maintenance of weight loss. Dexfenfluramine is the dextrorotatory isomer of d,l-fenfluramine (Pondimin), which has been marketed for short-term weight reduction for many years and recently has been widely used in combination with phentermine (Ionamin, and others), a sympathomimetic drug (Medical Letter, 36:107, 1994).

Basiliximab (Simulect - Novartis) and daclizumab (Zenapax - Roche), two mouse/human monoclonal antibodies that block the interleukin-2 (IL-2) receptor on Tlymphocytes, have been approved by the FDA for use in the prevention of acute renal transplant rejection. Both drugs are used with cyclosporine (Sandimmune; Neoral) and corticosteroids. An all-murine anti-CD3 monoclonal antibody, muromonab-CD3 (Orthoclone OKT3), has been available in the USA for many years for treatment of transplant rejection, and has also been used with some success for prophylaxis (MI Wilde and KL Goa, Drugs,...

The FDA has approved marketing of Plan B (Women's Capital Corporation), an emergency contraceptive "pill pack"that contains two 0.75-mg tablets of levonorgestrel.

Alosetron hydrochloride (Lotronex - Glaxo Welcome), a selective serotonin receptor antagonist, has received FDA approval for treatment of irritable bowel syndrome (IBS) in women whose primary bowel symptom is diarrhea.

Cevimeline hydrochloride, an acetylcholine derivative, has been approved by the FDA for treatment of dry mouth symptoms caused by Sjogren's syndrome. Presumably it could also be used to treat radiation-induced xerostomia in patients with head and neck cancer. Pilocarpine hydrochloride is FDA-approved for both indications

Eflornithine hydrochloride cream 13.9% (Vaniqa - Bristol-Myers Squibb) has been approved by the FDA for reduction of unwanted facial hair in women.