By API Standards
- Rabeprazole
- Ractopamine
- Ralfinamide
- Ramelteon
- Ramipril
- Ramiprilat
- Ranitidine
- Ranolazine
- Rapamycin
- Rasagiline
- Rebamipide
- Regorafenib
- Remdesivir
- Repaglinide
- Resmetirom
- Ribavirin
- Ribociclib
- Riociguat
- Risperidone
- Ritonavir
- Rivaroxaban
- Rivastigmine
- Roflumilast
- Rosuvastatin
- Roxadustat
- RPR 121057
- RS 94287
- Rupatadine
- Rutin