| Actinomycines | Not Available | 1 | 7 | Details |
| Actins, antagonists & inhibitors | Not Available | 1 | 1 | Details |
| Actively Acquired Immunity | Not Available | 94 | 1 | Details |
| Activin Receptors | Receptors for ACTIVINS are membrane protein kinases belonging to the family of PROTEIN-... more | 1 | 0 | Details |
| Acute-Phase Proteins | Proteins that are secreted into the blood in increased or decreased quantities by hepat... more | 3 | 1 | Details |
| Acyclovir | A GUANOSINE analog that acts as an antimetabolite. Viruses are especially susceptible. ... more | 3 | 23 | Details |
| Acyclovir and prodrug | Not Available | 2 | 29 | Details |
| Acyltransferases | Enzymes from the transferase class that catalyze the transfer of acyl groups from donor... more | 1 | 0 | Details |
| Adamantane | A tricyclo bridged hydrocarbon. | 6 | 25 | Details |
| Adamantane Derivatives | Not Available | 1 | 10 | Details |
| Adamantanes | Adamantanes are a class of antiviral medications which are active against influenza A b... more | 2 | 11 | Details |
| Adenine Nucleotides | Not Available | 45 | 516 | Details |
| Adenosine | A nucleoside that is composed of ADENINE and D-RIBOSE. Adenosine or adenosine derivativ... more | 14 | 99 | Details |
| Adenosine A1 Receptor Agonists | Not Available | 2 | 0 | Details |
| Adenosine A1 Receptor Antagonists | Compounds that bind to and block the stimulation of ADENOSINE A1 RECEPTORS. | 2 | 1 | Details |
| Adenosine A2 Receptor Agonists | Compounds that selectively bind to and activate ADENOSINE A2 RECEPTORS. | 4 | 3 | Details |
| Adenosine A2 Receptor Antagonists | Compounds that selectively bind to and block the activation of ADENOSINE A2 RECEPTORS. | 4 | 29 | Details |
| Adenosine Deaminase | Not Available | 0 | 0 | Details |
| Adenosine Deaminase Inhibitors | Drugs that inhibit ADENOSINE DEAMINASE activity. | 1 | 1 | Details |
| Adenosine Kinase, antagonists & inhibitors | Not Available | 1 | 3 | Details |
| Adenosine Monophosphate | Adenine nucleotide containing one phosphate group esterified to the sugar moiety in the... more | 1 | 2 | Details |
| Adenosine Triphosphatases | A group of enzymes which catalyze the hydrolysis of ATP. The hydrolysis reaction is usu... more | 1 | 0 | Details |
| Adenosine Triphosphatases, antagonists & inhibitors | Not Available | 1 | 1 | Details |
| Adenosine Triphosphate | Not Available | 1 | 43 | Details |
| Adenosine, antagonists & inhibitors | Not Available | 1 | 7 | Details |