Pfizer To License Antiretroviral To IPM For Reformulation As Microbicide
Selzentry, known generically as maraviroc, belongs to a new class of antiretrovirals that could provide an alternative to HIV-positive people who have developed resistance to multiple drugs. The treatment works by blocking a protein, called CCR5, on human immune system cells that HIV uses as a portal to enter and infect the cell. Pfizer has proposed using the drug to treat people with advanced HIV or AIDS who have not responded to other medications. FDA approved Selzentry in August 2007 on the condition that the drug's label include a black box warning about an increased risk of heart attack. FDA also is requiring Pfizer to conduct further research into the drug's long-term side effects (Kaiser Daily HIV/AIDS Report, 9/25/07).
Jack Watters, Pfizer's vice president of external medical affairs, said he is optimistic about Selzentry's prospects as a preventive treatment but added that researchers are "a long way from proving that." Zeda Rosenberg, IPM's chief executive, said a topical formulation of the drug is preferred to daily pills because a lower dose of medicine gets into the bloodstream with topical application, increasing the safety for long-term use. The topical form also can be applied directly where HIV enters the body, she added.
According to the Journal, IPM "offers a low-risk way for Pfizer to find out if" Selzentry could "become a frequently taken drug, while potentially offering an empowering concept to women in the developing world." In addition, because the drug already has FDA approval, it could be easier to conduct tests of Selzentry in modified forms, the Journal reports. Selzentry also might be more appropriate for use as a microbicide than other antiretrovirals that block HIV-infected cells from replicating because it prevents the virus from infecting healthy cells (Wall Street Journal, 1/30).
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View drug information on Selzentry.
Pfizer de a licenþei de medicamente antiretrovirale, de reformulare a IPM pentru ca Microbicide - Pfizer To License Antiretroviral To IPM For Reformulation As Microbicide - articole medicale engleza - startsanatate