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Zidovudine ( ZDV ), also known as azidothymidine ( AZT ), is an antiretroviral medication used to prevent and treat HIV/AIDS.
Common side effects include headaches, fever, and nausea.
Zidovudine was first described in 1964.
1 Medical uses
1.1 HIV treatment
1.2 HIV prevention
2 Side effects
2.1 Viral resistance
3 Mechanism of action
4 Chemistry
5 History
6 Society and culture
7 References
8 External links
Medical uses
HIV treatment
AZT is usually dosed twice a day in combination with other antiretroviral therapies. This approach is referred to as Highly Active Antiretroviral Therapy ( HAART ) and is used to prevent the likelihood of HIV resistance.
HIV prevention
AZT has been used for post-exposure prophylaxis (PEP) in combination with another antiretroviral drug called lamivudine. Together they work to substantially reduce the risk of HIV infection following the first single exposure to the virus.
AZT is now a principal part of the clinical pathway for both pre-exposure prophylaxis and post-exposure treatment of mother-to-child transmission of HIV during pregnancy, labor, and delivery and has been proven to be integral to uninfected siblings’ perinatal and neonatal development.
During 1994 to 1999, AZT was the primary form of prevention of mother-to-child HIV transmission. AZT prophylaxis prevented more than 1000 parental and infant deaths from AIDS in the United States.
Side effects
Most common side-effects include nausea, vomiting, acid reflux (heartburn), headache, cosmetic reduction in abdominal body fat, light sleeping, and loss of appetite. Less common side effects include faint discoloration of fingernails and toenails, mood elevation, occasional tingling or transient numbness of the hands or feet, and minor skin discoloration. Allergic reactions are rare.
Early long-term higher-dose therapy with AZT was initially associated with side effects that sometimes limited therapy, including anemia, neutropenia, hepatotoxicity, cardiomyopathy, and myopathy. All of these conditions were generally found to be reversible upon reduction of AZT dosages. They have been attributed to several possible causes, including transient depletion of mitochondrial DNA, sensitivity of the γ-DNA polymerase in some cell mitochondria,
According to IARC, there is sufficient evidence in experimental animals for the carcinogenicity of zidovudine; it is possibly carcinogenic to humans (Group 2B).
Viral resistance
Even at the highest doses that can be tolerated in patients, AZT is not potent enough to prevent all HIV replication and may only slow the replication of the virus and progression of the disease. Prolonged AZT treatment can lead to HIV developing resistance to AZT by mutation of its reverse transcriptase. To slow the development of resistance, physicians generally recommend that AZT be given in combination with another reverse transcriptase inhibitor and an antiretroviral from another group, such as a protease inhibitor, non-nucleoside reverse transcriptase inhibitor, or integrase inhibitor ; this type of therapy is known as HAART (Highly Active Anti Retroviral Therapy).
Mechanism of action
AZT in oral, injectable, and suppository form
AZT is a thymidine analogue. AZT works by selectively inhibiting HIV’s reverse transcriptase, the enzyme that the virus uses to make a DNA copy of its RNA. Reverse transcription is necessary for production of HIV’s double-stranded DNA, which would be subsequently integrated into the genetic material of the infected cell (where it is called a provirus ).
Cellular enzymes convert AZT into the effective 5′-triphosphate form. Studies have shown that the termination of HIV’s forming DNA chains is the specific factor in the inhibitory effect.
At very high doses, AZT’s triphosphate form may also inhibit DNA polymerase used by human cells to undergo cell division, but regardless of dosage AZT has an approximately 100-fold greater affinity for HIV’s reverse transcriptase.
A salt crystal of AZT, viewed under polarized light
AZT crystallizes into an asymmetric nucleated monoclinic salt structure, forming an equalized hydrogen-nitrogen-oxygen bonded network of base-paired dimers; its multiscaled crystallized lattice superstructure and surfactant headgroup electrostatic bond polarity was reported in 1988 and 1987.
In the 1960s the theory that most cancers were caused by environmental retroviruses gained clinical support and funding. It had recently become known, due to the work of Nobel laureates Howard Temin and David Baltimore, that nearly all avian cancers were caused by bird retroviruses, but corresponding human retroviruses have not yet been found.
In parallel work, other compounds that successfully blocked the synthesis of nucleic acids had been proven to be both antibacterial, antiviral, and anticancer agents, the leading work being done at the laboratory of Nobel laureates George Hitchings and Gertrude Elion, leading to the development of the antitumor agent 6-mercaptopurine.
Jerome Horwitz of the Barbara Ann Karmanos Cancer Institute and Wayne State University School of Medicine first synthesized AZT in 1964 under a US National Institutes of Health (NIH) grant.
Azidothymidine was first synthesized at the Michigan Cancer foundation in 1964 as part of a program directed toward the discovery of anticancer drugs. It gave negative results and attracted little further interest. In 1974, Wolfram Ostertag at the Max Planck Institute demonstrated the ability of AZT to inhibit the replication of the Friend leukemia virus in cell culture. This report attracted little interest from other researchers as the Friend leukemia virus is a retrovirus, and at the time, there were no known human diseases caused by retroviruses.
In 1983 researchers at the Institut Pasteur in Paris identified the retrovirus now known as the Human Immunodeficiency Virus (HIV) as the cause of acquired immunodeficiency syndrome (AIDS) in humans. This assay could simultaneously test both the anti-HIV effect of the compounds and their toxicity against infected T cells.
In June 1984, Burroughs-Wellcome virologist Marty St. Clair set up a program to discover drugs with the potential to inhibit HIV replication. Burroughs-Wellcome had expertise in nucleoside analogs and viral diseases, led by researchers including George Hitchings, Gertrude Elion, David Barry, Paul (Chip) McGuirt Jr., Philip Furman, Martha St. Clair, Janet Rideout, Sandra Lehrman and others. Their research efforts were focused in part on the viral enzyme reverse transcriptase. Reverse transcriptase is an enzyme that retroviruses, including HIV, utilize to replicate themselves. Secondary testing was performed in mouse cells infected with the retroviruses Friend virus or Harvey sarcoma virus, as the Wellcome group did not have a viable in-house HIV antiviral assay in place at that time, and these other retroviruses were believed to represent reasonable surrogates. AZT proved to be a remarkably potent inhibitor of both Friend virus and Harvey sarcoma virus, and a search of the company’s records showed that it had demonstrated low toxicity when tested for its antibacterial activity in rats many years earlier. Based in part on these results, AZT was selected by nucleoside chemist Janet Rideout as one of 11 compounds to send to the NCI for testing in that organization’s HIV antiviral assay.
In February 1985, the NCI scientists found that AZT had potent efficacy in vitro.
Several months later, a phase 1 clinical trial of AZT at the NCI was initiated at the NCI and Duke University,.
In doing this Phase I trial, they built on their experience in doing an earlier trial, with suramin, another drug that had shown effective anti-HIV activity in the laboratory. This initial trial of AZT proved that the drug could be safely administered to patients with HIV, that it increased their CD4 counts, restored T cell immunity as measured by skin testing, and that it showed strong evidence of clinical effectiveness, such as inducing weight gain in AIDS patients. It also showed that levels of AZT that worked in vitro could be injected into patients in serum and suppository form, and that the drug penetrated deeply only into infected brains.
A rigorous double-blind, placebo -controlled randomized trial of AZT was subsequently conducted by Burroughs-Wellcome and proved that AZT safely prolongs the lives of people with HIV. The time between the first demonstration that AZT was active against HIV in the laboratory and its approval was 25 months, the shortest period of drug development in recent history.
AZT was subsequently approved unanimously for infants and children in 1990. AZT was initially administered in somewhat higher dosages than today, typically 400 mg every four hours, day and night. The paucity of alternatives for treating HIV/AIDS at that time unambiguously affirmed the health risk/benefit ratio, with inevitable slow, disfiguring, and painful death from HIV outweighing the drug’s side-effect of transient anemia and malaise.
Society and culture
See also: Cost of HIV treatment
In 1991, the advocacy group Public Citizen filed a lawsuit claiming that the patents were invalid. Subsequently, Barr Laboratories and Novopharm Ltd. also challenged the patent, in part based on the assertion that NCI scientists Samuel Broder, Hiroaki Mitsuya, and Robert Yarchoan should have been named as inventors, and those two companies applied to the FDA to sell AZT as a generic drug. In response, Burroughs Wellcome Co. filed a lawsuit against the two companies. The United States Court of Appeals for the Federal Circuit ruled in 1992 in favor of Burroughs Wellcome, ruling that even though they had never tested it against HIV, they had conceived of it working before they sent it to the NCI scientists. This suit was appealed up to the Supreme Court of the US, but in 1996 they declined to formally review it.
In 2002, another lawsuit was filed challenging the patent by the AIDS Healthcare Foundation, which also filed an antitrust case against GSK as well.
GSK’s patents on AZT expired in 2005 and in September 2005 the FDA approved three generic versions.

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