| Reducing Agents | Materials that add an electron to an element or compound, that is, decrease the positiv... more | 1 | 3 | Details |
| Reducing and Complexing Thiol | Not Available | 1 | 8 | Details |
| Reduction Activity | Not Available | 1 | 15 | Details |
| Renal Agents | Drugs used for their effects on the kidneys' regulation of body fluid composition and v... more | 4 | 41 | Details |
| Renal Dehydropeptidase Inhibitor | Not Available | 1 | 3 | Details |
| Renal System | Not Available | 3 | 3 | Details |
| Renin Inhibitors | Agents that inhibit the activity of RENIN and cause VASODILATION. | 5 | 9 | Details |
| Replacement Preparations | Not Available | 22 | 266 | Details |
| Reproductive Control Agents | Substances used either in the prevention or facilitation of pregnancy. | 89 | 521 | Details |
| Resins, Plant | Flammable, amorphous, vegetable products of secretion or disintegration, usually formed... more | 6 | 9 | Details |
| Resins, Synthetic | Polymers of high molecular weight which at some stage are capable of being molded and t... more | 6 | 1 | Details |
| Resorcinols | A water-soluble crystalline benzene-1,3-diol (resorcinol) and its derivatives. | 3 | 6 | Details |
| Respiratory Agents, Miscellaneous | Not Available | 3 | 10 | Details |
| Respiratory and CNS Stimulants | Not Available | 2 | 29 | Details |
| Respiratory Smooth Muscle Relaxants | Not Available | 3 | 43 | Details |
| Respiratory syncytial virus (RSV) vaccines | Vaccines intended to protect against disease caused by infection with respiratory syncy... more | 4 | 0 | Details |
| Respiratory Syncytial Virus Anti-F Protein Monoclonal Antibody | Not Available | 3 | 14 | Details |
| Respiratory Syncytial Viruses | Not Available | 1 | 0 | Details |
| Respiratory System Agents | Drugs used for their effects on the respiratory system. | 137 | 672 | Details |
| Restless Legs Syndrome | Not Available | 1 | 8 | Details |
| Retinoic Acid Receptor gamma, agonists | Not Available | 1 | 10 | Details |
| Retinoid X Receptors | Not Available | 0 | 0 | Details |
| Retinoids | A group of tetraterpenes, with four terpene units joined head-to-tail. Biologically act... more | 20 | 144 | Details |
| Retinoids for cancer treatment | Not Available | 3 | 50 | Details |
| Retinoids for Topical Use in Acne | Not Available | 6 | 78 | Details |