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Drugs for Flu Prevention
Two new drugs, one inhaled (zanamivir [Relenza]) and one in pill form (oseltamivir [Tamiflu]), were approved for treating the two common strains of influenza virus (types A and B). The drugs were the first of a new class of antiviral compounds called neuraminadase inhibitors. Studies showed that zanamivir was 80% effective in preventing flu. It also reduced the duration of flu symptoms by a day or two. Oseltamivir was similarly effective, preventing flu in up to 84% of adults who took the medication once daily for six weeks. Many physicians questioned whether use of the new drugs would be cost-effective, and infectious-disease experts emphasized that inexpensive, widely available vaccines at the beginning of the flu season remained the best protection.
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