The CDC recently announced that it will now supply the investigational drug miltefosine (Impavido – Paladin, Canada) for treatment of infections caused by free-living amebae.1 The drug was previously available in the US only from the manufacturer through an FDA Investigational New Drug (IND) application.

Meningoencephalitis caused by the free-living amebae Naegleria fowleri, Acanthamoeba spp., or Balamuthia mandrillaris, usually acquired through the nose while swimming in warm fresh water, has a mortality rate of >90% despite treatment with multiple antimicrobial drugs.2 Miltefosine is active against free-living amebae in vitro, and addition of the drug has improved survival in a small number of patients with Acanthamoeba spp. or B. mandrillaris infection. Infection with N. fowleri is especially severe; of 128 people known to be infected in the US since 1962, only one has survived. Miltefosine has not yet been shown to successfully treat N. fowleri infection.

Miltefosine is also used for treatment of visceral, cutaneous and mucosal leishmaniasis,2 and may soon be approved by the FDA for this indication.

1. CDC. Investigational drug available directly from the CDC for the treatment of infections with free-living amebae. MMWR 2013; 62:666. Available at http://www.cdc.gov. Accessed October 18, 2013.

2. Drugs for parasitic infections.Treat Guidel Med Lett 2013; 11:e1.

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Parasitic infections are found throughout the world. With increasing travel, immigration, use of immunosuppressive drugs and the spread of AIDS, physicians anywhere may see infections caused by previously unfamiliar parasites. The table below lists first-choice and alternative drugs for most parasitic infections. The brand names and manufacturers of the drugs are listed in this article.

Superseded--purchase updated Parasitic Infections article
Parasitic infections are found throughout the world. With increasing travel, immigration, use of immunosuppressive drugs and the spread of AIDS, physicians anywhere may see infections caused by previously unfamiliar parasites.

Note: Drugs for Parasitic Infections, revised and updated, is now available to both subscribers and nonsubscribers on our web site. This article, a bi-annual feature of The Medical Letter for many years, will not be published as a printed issue in 2002, but is included in the 16th edition of The Medical Letter Handbook of Antimicrobial Therapy. The handbook is now available and can be ordered by calling customer service at 1-800-211-2769.

(Superseded by the 2013 version. Click here to purchase.)
Parasitic infections are found throughout the world. With increasing travel, immigration, use of immunosuppressive drugs and the spread of AIDS, physicians anywhere may see infections caused by previously unfamiliar parasites. The table lists first-choice and alternative drugs for most parasitic infections.