| AZT | <drug> A nucleoside analogue used to slow replication of HIV AZT is approved for the initial treatment of HIV infection. AZT is increasingly administered in combination with other antiviral drugs, especially 3TC (a combination that is under consideration by the FDA as another initial treatment regimen for HIV) as well as ddC (an FDA-approved combination for persons with progressive disease and CD4 cell counts below 300). Possible side effects include bone marrow suppression leading to anaemia, leukopenia or neutropenia nausea, muscle weakness and headaches. (09 Oct 1997) |
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| Aztec ear | An auricle with the lobule absent. (05 Mar 2000) |
| aztobacter | <bacteria> Aztobacter is a species of large, oval, aerobic Gram-negative bacteria that can fix atmospheric nitrogen if they have an energy source (often a carbohydrate) available. (09 Oct 1997) |
| aztreonam | <chemical> A monocyclic beta-lactam antibiotic originally isolated from chromobacterium violaceum. It is resistant to beta-lactamases and is used in gram-negative infections, especially of the meninges, bladder, and kidneys. It may cause a superinfection with gram-positive organisms. Pharmacological action: monobactams. Chemical name: Propanoic acid, 2-(((1-(2-amino-4-thiazolyl)-2-((2-methyl-4-oxo-1-sulfo-3-azetidinyl)amino)-2-oxoethylidene)amino)oxy)-2-methyl-, (2S-(2alpha,3beta(Z)))- (12 Dec 1998) |