| Quinoline Derivatives and Related Substances | Not Available | 3 | 9 | Details |
| Quinolines | Cyclic compounds that include atoms other than carbon in their ring structure. | 157 | 755 | Details |
| Quinolinic Acids | Dicarboxylic acids with a PYRIDINE backbone. Quinolinic Acids are downstream products o... more | 1 | 2 | Details |
| Quinolinium Compounds | Cyclic compounds that include atoms other than carbon in their ring structure. | 2 | 17 | Details |
| Quinolizidine Alkaloids | Alkaloids containing QUINOLIZIDINE ring structure. They are found in the genistoid legu... more | 3 | 6 | Details |
| Quinolizidines | Saturated quinolizines that are two fused six-membered rings with a nitrogen atom at th... more | 3 | 8 | Details |
| Quinolizines | Cyclic compounds that include atoms other than carbon in their ring structure. | 8 | 25 | Details |
| Quinolone Antimicrobial | Not Available | 10 | 107 | Details |
| Quinolone Vasodilators | Not Available | 1 | 2 | Details |
| Quinolones | A group of derivatives of naphthyridine carboxylic acid, quinoline carboxylic acid, or ... more | 53 | 353 | Details |
| Quinone Reductases, antagonists & inhibitors | Not Available | 1 | 1 | Details |
| Quinones | Hydrocarbon rings which contain two ketone moieties in any position. They can be substi... more | 63 | 231 | Details |
| Quinoxalines | Cyclic compounds that include atoms other than carbon in their ring structure. | 9 | 21 | Details |
| Quinuclidines | Cyclic compounds that include atoms other than carbon in their ring structure. | 7 | 77 | Details |
| Quorum Sensing | Not Available | 1 | 1 | Details |
| Rabies Vaccines | Not Available | 2 | 0 | Details |
| Radiation-Protective Agents | Drugs used to protect against ionizing radiation. They are usually of interest for use ... more | 31 | 82 | Details |
| Radiation-Sensitizing Agents | Drugs used to potentiate the effectiveness of radiation therapy in destroying unwanted ... more | 52 | 142 | Details |
| Radioactive alpha-Particle Emitting Therapeutic Agent | Not Available | 2 | 1 | Details |
| Radioactive Diagnostic Agent | Not Available | 54 | 96 | Details |
| Radioactive Therapeutic Agent | Not Available | 6 | 10 | Details |
| Radioactive Tracers | Not Available | 0 | 0 | Details |
| Radiographic Contrast Agent | Not Available | 15 | 22 | Details |
| Radioimmunodetection | Not Available | 1 | 1 | Details |
| Radioimmunotherapy | Not Available | 1 | 2 | Details |