Home > For Consumers > When used with AZT, ddI and perhaps ddC,...

PubMed Health. A service of the National Library of Medicine, National Institutes of Health.

Cochrane Database of Systematic Reviews: Plain Language Summaries [Internet]. Chichester, UK: John Wiley & Sons, Ltd; 2003-.

  • This Cochrane review has been classified "stable" by the Cochrane Collaboration. The review is regarded as up-to-date, because there is unlikely to be new evidence that could change this review's conclusions.

Cochrane Database of Systematic Reviews: Plain Language Summaries [Internet].

When used with AZT, ddI and perhaps ddC, can delay HIV disease progression and death

This version published: 2010; Review content assessed as up-to-date: March 05, 2000.

Link to full article: [Cochrane Library]

Plain language summary

Zidovudine (AZT) was the first antiretroviral drug used in HIV and AIDS. It is expensive and has several adverse effects including nausea, vomiting, blood problems (anaemia and neutropenia) and myopathy (muscle weakness). The next two drugs developed for HIV were didanosine (ddI) and zalcitabine (ddC). The adverse effects of ddI include nausea, vomiting, diarrhoea and problems with the pancreas (pancreatitis) and nerves in the arms and legs (peripheral neuropathy). Adverse effects of ddC are mouth ulcers and peripheral neuropathy. The review of trials found that both HIV disease progression and death are delayed by ddI, and perhaps also by ddC, at least when used with AZT.


Background: Zidovudine (AZT) monotherapy was the first antiretroviral drug to be tested widely. The next two drugs to be developed were didanosine (ddI) and zalcitabine (ddC).

Objectives: To assess the effects of zidovudine (AZT), zidovudine plus didanosine (ddI) and zidovudine plus zalcitabine (ddC) on HIV disease progression and survival.

Search methods: Investigators and pharmaceutical companies were contacted, and MEDLINE searches were supplemented by searching conference abstracts.

Selection criteria: Randomised controlled trials comparing any two of AZT plus ddI, AZT plus ddC or AZT alone in participants with or without AIDS which collected information on deaths and new AIDS events.

Data collection and analysis: Individual patient data with, wherever possible, follow‐up obtained beyond that previously published were obtained and checked for internal consistency and consistency with any published reports; any apparent discrepancies were resolved with the trialists.

Time to death and to disease progression (defined as a new AIDS‐defining event or prior death) were analysed on an intention to treat basis, stratified to avoid direct comparisons between participants in different trials.

Main results: Six trials were included in the meta‐analysis. During a median follow‐up of 29 months, 2904 individuals progressed, of whom 1850 died. The addition of ddI to AZT delayed both progression (RR 0.74; 95% CI 0.67 to 0.82, P<0.0001) and death (RR 0.72; 95% CI 0.64 to 0.82, P<0.0001). Likewise, the addition of ddC to AZT also delayed progression (RR 0.86; 95% CI 0.78 to 0.94, P=0.001) and death (RR 0.87; 95% CI 0.77 to 0.98, P=0.02). After 3 years the estimated percentages alive and without a new AIDS event were 53% for AZT+ddI, 49% for AZT+ddC and 44% for AZT alone; the percentages alive were 68%, 63% and 59% respectively. Five of the six trials involved randomised comparisons of AZT+ddI versus AZT+ddC: in these, the AZT+ddI regimen had greater effects on disease progression (P=0.004) and death (P=0.009).

Authors' conclusions: The use of ddI and, to a lesser extent, ddC delayed both HIV disease progression and death, at least when added to AZT.

Editorial Group: Cochrane HIV/AIDS Group.

Publication status: Stable (no update expected for reasons given in 'What's new').

Citation: Darbyshire J, Foulkes M, Peto R, Duncan W, Babiker A, Collins R, Hughes M, Peto TEA, Walker SA. Zidovudine (AZT) versus AZT plus didanosine (ddI) versus AZT plus zalcitabine (ddC) in HIV infected adults. Cochrane Database of Systematic Reviews 2000, Issue 3. Art. No.: CD002038. DOI: 10.1002/14651858.CD002038. Link to Cochrane Library. [PubMed: 10908523]

Copyright © 2010 The Cochrane Collaboration. Published by John Wiley & Sons, Ltd.

PMID: 10908523

PubMed Health Blog...

read all...

Recent Activity

Your browsing activity is empty.

Activity recording is turned off.

Turn recording back on

See more...