Final answer:
Raltegravir is an integrase inhibitor used to treat HIV infections by blocking the integrase enzyme, an essential step in HIV replication.
Explanation:
Raltegravir (Isentress) is classified as an integrase inhibitor used in the treatment of HIV. This medication works by inhibiting the integrase enzyme, essential for integrating HIV DNA into cellular DNA, thus slowing down disease progression in patients.
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