| Roxatidine acetate | 78628-28-1 | H2 antagonists | 2 |
| Rucaparib | 283173-50-2 | Enzyme Replacements/modifiers | 2 |
| Ruxolitinib Phosphate | 941678-49-5 | | 2 |
| Ruxolitinib Phosphate Intermediates | | | 2 |
| S-Carboxymethyl-L-cysteine | 2387-59-9 | | 2 |
| SG3199 | 1595275-71-0 | Other antithrombin | 2 |
| Sacubitril valsartan | 936623-90-4 | | 2 |
| Sapropterin | 62989-33-7 | Central Nervous System Agents | 2 |
| Saquinavir | 127779-20-8 | Anti-HIV | 2 |
| Secobarbital | 76-73-3 | Barbiturates | 2 |
| Selamectin | 1092939-17-7 | | 2 |
| Semaglutide Secondary Acylation Intermediate | | | 2 |
| Shikonin | 517-89-5 | Other anticancer drugs | 2 |
| Siberian ginseng root | | Herbal remedies | 2 |
| Simethicone Emulsion 30% | | | 2 |
| Siponimod | 1230487-00-9 | Immunosuppressants | 2 |
| Sodium Acetylated Hyaluronate | 220119-17-5 | | 2 |
| Sodium Alendronate | 121268-17-5 | | 2 |
| Sodium Cholesteryl sulfate | 2864-50-8 | Lipid-lowering agents | 2 |
| Sodium Tetradecyl Sulfate | 139-88-8 | Sclerosing agents | 2 |
| Sodium molybdate dihydrate | 10102-40-6 | Other essential nutrients | 2 |
| Sodium selenite | 10102-18-8 | Other essential nutrients | 2 |
| Sofalcone | 64506-49-6 | Other gastrointestinal agents | 2 |
| Solithromycin | 760981-83-7 | Macrolides | 2 |
| Sorbic acid | 110-44-1 | Disinfectants | 2 |
| Sorbitan Monostearate | 1338-41-6 | Dermatics | 2 |
| Sorbitan Oleate | | Dermatics | 2 |
| Sorbitan trioleate | 26266-58-0 | Dermatics | 2 |
| Soybean oil | | Other lipid-lowering agents | 2 |
| Spirulina powder | | Herbal remedies | 2 |
| Stanozolol | 10418-03-8 | Androgens | 2 |
| Sulfachloropyrazine | | Sulfonamides and trimethoprim | 2 |
| Tafamidis meglumine | 951861-88-8 | | 2 |
| Tapinarof | 79338-84-4 | Anti-inflammatory Agents | 2 |
| Temocapril | 111902-57-9 | ACE inhibitors | 2 |
| Teniposide | 29767-20-2 | Antineoplastics | 2 |
| Tetrahydro-4H-Pyran-4-One | 29943-42-8 | | 2 |
| Tetrakis(triphenylphosphine)palladium | 202138-50-9 | | 2 |
| Tetramisole | 122628-50-6 | | 2 |
| Thiamphenicol | 15318-45-3 | Other anti-infective agents | 2 |