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<p><strong>You Are Here:</strong> <span class="crumb_link"><a href="/" class="crumb_link">AHRQ Archive Home</a> > <a href="/research/resarch.htm" class="crumb_link"><em>Research Activities</em> Archive</a> > <a href="." class="crumb_link">April 1996</a> </span></p>
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<tr>
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<td><h1><a name="h1" id="h1"></a>HIV/AIDS Research </h1>
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<td><div id="centerContent"><div class="headnote">
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<p>This information is for reference purposes only. It was current when produced and may now be outdated. Archive material is no longer maintained, and some links may not work. Persons with disabilities having difficulty accessing this information should contact us at: <a href="https://info.ahrq.gov/">https://info.ahrq.gov</a>. Let us know the nature of the problem, the Web address of what you want, and your contact information. </p>
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<p>Please go to <a href="https://www.ahrq.gov/">www.ahrq.gov</a> for current information.</p></div>
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<a name="head1"></a>
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<h2>Trimethoprim-sulfamethoxazole continues to be the best
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choice for preventing PCP in AIDS patients</h2>
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<p><em>Pneumocystis carinii</em> pneumonia (PCP) remains one of the most
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common life-threatening complications of AIDS. Of the three
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regimens most often used for PCP prophylaxis,
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trimethoprim-sulfamethoxazole (TMP-SMX) is superior to prevent
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initial and second-time PCP (primary and secondary prophylaxis)
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and most cost-effective for secondary prophylaxis, according to
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two studies supported in part by the Agency for Health Care
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Policy and Research (HS07782 and HS06694).</p><p>
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A meta-analysis of 35 randomized trials (conducted between 1991
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and 1995 and involving 6,583 patients) led by Joseph Lau, M.D.,
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of New England Medical Center Hospitals, compared three different
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treatment regimens: TMP-SMX, dapsone, (both are oral
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medications), and aerosolized pentamidine (AP) with each other or
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placebo. AP was well tolerated regardless of the dose used (usual
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recommended dose is 300 mg per month via nebulizer), but
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prophylaxis failure might be halved if the dose were doubled.
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Oral medications were five times more likely than AP to be
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discontinued because of toxic reactions.</p>
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<p>Regardless of dose, TMP-SMX was almost universally effective for
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patients who tolerated it. The risk of discontinuation because of
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side effects decreased 43 percent if one double-strength tablet
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(160 mg TMP, 800 mg SMX) was given three times per week instead
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of daily (usual recommended dose). For dapsone, in 100 patients
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given 100 mg per day instead of twice per week for 1 year
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(primary prophylaxis), 7 fewer patients would develop PCP, but 17
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more would have significant toxic reactions.</p><p>
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The second study shows that TMP-SMX also is more cost-effective
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than AP for preventing recurring PCP. Investigators at Dartmouth
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Medical School developed a model of secondary PCP prophylaxis
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based on the medical literature and then used efficacy and
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toxicity data from a controlled clinical trial to validate the
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model. They compared three clinical strategies in a hypothetical
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group of patients who had completed 21 days of therapy for PCP:
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no prophylaxis (control group), prophylaxis with TMP-SMX (one
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double-strength tablet per day), and prophylaxis with AP (300 mg
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per month).</p>
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<p>In the literature-based model, yearly prophylaxis costs for
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TMP-SMX and AP were $468 and $1,577, respectively. Assuming equal
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efficacy for the two agents, the incremental cost-effectiveness
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ratio for TMP-SMX was $350 compared with no prophylaxis; for AP
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it was $110,880 compared with TMP-SMX, since AP was associated
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with only a minimal increase in life expectancy and a substantial
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increase in cost. Data from the randomized trial indicated annual
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costs of $656 per person for TMP-SMX and $1,573 per person for
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AP. This translates into annual savings of over $17.4 million for
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the 19,039 patients newly diagnosed as having PCP in 1993, if
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they were started on TMP-SMX rather than AP to prevent
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reinfection with PCP.</p>
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<p>More details of the first study are in "Meta-analysis of the
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relative efficacy and toxicity of <em>Pneumocystis carinii</em> prophylactic regimens," by John P. Ioannidis, M.D., Joseph C.
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Cappeleri, Ph.D., M.P.H., Paul R. Skolnik, M.D., and others, in
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the January 22, 1996 <em>Archives of Internal Medicine</em> 156,
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pp. 177-188.</p> <p>For the second study, see "Validating
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literature-based models with direct clinical trial results," by
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Kenneth A Freedberg, M.D., M.Sc., W. David Hardy, M.D., Robert S.
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Holzman, M.D., and others, in the January 1996 issue of <em>Medical Decision Making</em> 16(1), pp. 29-35. </p>
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<p class="size2"><a href=".">Return to Contents</a><br />
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<a href="dept8.htm">Proceed to Next Article</a></p>
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<div class="footnote">
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<p> The information on this page is archived and provided for reference purposes only.</p></div>
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