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                                                                Synonyms: VX-121 | VX121
                                 
                                                         
                            
                            
                            
                                 
                                
                                vanzacaftor is an approved drug 
                                                        
                                                    
                                Compound class: 
                                                            Synthetic organic
                                 
                                
                                    
                                        Comment: Vanzacaftor (VX-121) is a cystic fibrosis transmembrane regulator (CFTR) protein corrector for class II CFTR mutations (the most common being F508del). Its biological activity is similar to that of elexacaftor. Like elexacftor, off-target effects on K+ channels have been reported [2].
                                    
                                 
                            
                            
                          
                                
                                    
                                
                          
                                   
                                   
                                  
                                    
                                    
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Classification ![]()  | 
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| Compound class | Synthetic organic | 
| Approved drug? | Yes. UK MHRA (2025) | US FDA (2024) | 
International Nonproprietary Names ![]()  | 
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| INN number | INN | 
| 11971 | vanzacaftor | 
Synonyms ![]()  | 
                                                        
| VX-121 | VX121 | 
Database Links ![]()  | 
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| CAS Registry No. | 2374124-49-7 (source: WHO INN record) | 
| ChEMBL Ligand | CHEMBL5314934 | 
| DrugBank Ligand | DB18373 | 
| GtoPdb PubChem SID | 507750328 | 
| PubChem CID | 139399801 | 
| Search Google for chemical match using the InChIKey | VCSUIBJKYCVWNF-NRFANRHFSA-N | 
| Search Google for chemicals with the same backbone | VCSUIBJKYCVWNF | 
| Search PubMed clinical trials | vanzacaftor | 
| Search PubMed titles | vanzacaftor | 
| Search PubMed titles/abstracts | vanzacaftor | 
| UniChem Compound Search for chemical match using the InChIKey | VCSUIBJKYCVWNF-NRFANRHFSA-N | 
| UniChem Connectivity Search for chemical match using the InChIKey | VCSUIBJKYCVWNF-NRFANRHFSA-N |