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Zidovudine

Definition

Definition: Zidovudine (AZT), a nucleoside reverse transcriptase inhibitor (NRTI), is an antiretroviral drug used to treat and prevent Human Immunodeficiency Virus (HIV) infection. It was…

Definition: Zidovudine (AZT), a nucleoside reverse transcriptase inhibitor (NRTI), is an antiretroviral drug used to treat and prevent Human Immunodeficiency Virus (HIV) infection. It was the first drug approved for AIDS treatment, marking a pivotal moment in public health.

Zidovudine works by inhibiting the reverse transcriptase enzyme, which HIV uses to convert its RNA into DNA, a crucial step for viral replication. Its approval in 1987 was a landmark event, offering the first hope for individuals with HIV/AIDS, a disease previously considered universally fatal. Initially, Zidovudine dramatically improved the quality of life and extended the lifespan of many patients, significantly reducing the incidence of opportunistic infections and AIDS-related mortality. Its introduction initiated the era of antiretroviral therapy, fundamentally changing the approach to HIV management.

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While highly effective initially, Zidovudine monotherapy quickly led to the development of drug resistance and was associated with significant side effects, such as bone marrow suppression, anemia, and myopathy. This led to its current use primarily as part of highly active antiretroviral therapy (HAART) or antiretroviral therapy (ART) regimens, where it is combined with other drugs to enhance efficacy, reduce resistance, and mitigate side effects. Zidovudine remains particularly vital in public health for preventing mother-to-child transmission (PMTCT) of HIV, demonstrating its enduring importance in global efforts to control the epidemic.

Key Context:

  • Antiretroviral Therapy (ART/HAART): Zidovudine is a foundational component of combination drug regimens that have transformed HIV from a fatal disease into a manageable chronic condition.
  • Nucleoside Reverse Transcriptase Inhibitors (NRTIs): Zidovudine belongs to this class of drugs, which mimic natural nucleosides to block viral replication.
  • Prevention of Mother-to-Child Transmission (PMTCT): Zidovudine plays a crucial role in preventing HIV transmission from pregnant mothers to their infants.