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Journal Article
Review
Changes in the use profile of Mectizan: 1987-1997.
Annals of Tropical Medicine and Parasitology 1998 April
The usually conservative approach of Merck & Co. to drug development became even more so in the Mectizan (ivermectin, MSD) programme because of adverse experiences following 'extra-label' use in Collie dogs and the discovery of a low threshold for acute neurotoxicity in CF-1 mice. Although a very cautious approach and rapid development programme ensued, Merck remained conservative and excluded children under the age of 5 years, pregnant women, and mother who were nursing children under the age of 3 months from treatment. A subsequent, more relaxed set of standards was based on vast human clinical experience, inadvertent use in hundreds of pregnant women without ill-effect, and new laboratory information indicating that the presence of a protective blood-brain barrier protein component (P-glycoprotein) helped to stop Mectizan from crossing the placenta and from crossing the blood-brain barrier in most animal species, including humans. This has allowed more groups to be included in Mectizan treatments: pregnant women living in areas where the risk of loss of sight because of onchocerciasis is very high; and women who are nursing children as young as 1 week of age. Mass distribution of the drug continues to be largely under community control and the likelihood of serious adverse experiences related to finding a human population with unusually low levels of P-glycoprotein (or no P-glycoprotein) seems remote.
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