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Share capital (Details)
SFr / shares in Units, $ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 13, 2023
CHF (SFr)
SFr / shares
shares
Nov. 27, 2023
SFr / shares
shares
Jun. 14, 2023
CHF (SFr)
SFr / shares
shares
Apr. 03, 2023
CHF (SFr)
SFr / shares
shares
Apr. 03, 2023
USD ($)
$ / shares
shares
Dec. 15, 2022
CHF (SFr)
SFr / shares
shares
Oct. 31, 2022
CHF (SFr)
SFr / shares
shares
Oct. 26, 2022
EquityInstruments
SFr / shares
shares
Jul. 22, 2022
CHF (SFr)
SFr / shares
shares
Jul. 22, 2022
USD ($)
$ / shares
shares
Feb. 02, 2022
CHF (SFr)
SFr / shares
shares
Dec. 31, 2023
CHF (SFr)
SFr / shares
shares
Sep. 30, 2022
EquityInstruments
Dec. 31, 2022
CHF (SFr)
EquityInstruments
SFr / shares
shares
Sep. 30, 2022
EquityInstruments
Dec. 31, 2023
CHF (SFr)
SFr / shares
shares
Dec. 31, 2022
CHF (SFr)
SFr / shares
shares
Dec. 31, 2021
CHF (SFr)
shares
Dec. 12, 2023
CHF (SFr)
Oct. 23, 2023
Oct. 22, 2023
Jun. 13, 2023
CHF (SFr)
Dec. 14, 2022
CHF (SFr)
Oct. 30, 2022
CHF (SFr)
Jul. 19, 2022
CHF (SFr)
SFr / shares
Jul. 18, 2022
SFr / shares
Share capital                                                    
Number of shares at beginning of period                               (38,214,291)                    
Number of shares at beginning of period                               77,134,020 37,898,149                  
Issue of shares-exercise ESOP & ESC 12,527,235         17,438,883                   12,527,235 17,438,883                  
Sale of shares under shelf registration                               7,999,998 4,500,000                  
Exercise of pre-funded warrants 17,458,950                     6,120,000       23,578,950 15,978,570                  
Sale of shares under sale agency agreement                               4,006,373 1,355,248                  
Net purchase of shares under liquidity agreement                               (43,872) (36,830)                  
Acquisition of shares forfeited from DSPPP                               (7,311)                    
Number of shares at end of period                       (59,159,103)   (38,214,291)   (59,159,103) (38,214,291)                  
Number of shares at end of period                       125,195,393   77,134,020   125,195,393 77,134,020 37,898,149                
Number of shares reclassed as treasury shares under IFRS 2   (12,527,235)           (17,438,883)                                    
Number of shares reclassed as treasury shares under IFRS 2                       (29,958,807)   (17,438,883)   (29,958,807) (17,438,883)                  
Number of shares including IFRS 2 shares                       95,236,586   59,695,137   95,236,586 59,695,137                  
Share capital as registered in commercial register | SFr                       SFr 1,782,344.96       SFr 1,782,344.96                    
Number of shares registered in commercial register                       178,234,496       178,234,496                    
Number of shares represented by one depositary receipt                                       120 6          
ADS reverse split ratio                                       0.05            
Par value per share | SFr / shares SFr 0.01         SFr 0.01           SFr 0.01   SFr 0.01   SFr 0.01 SFr 0.01               SFr 0.01 SFr 1.00
Treasury shares | SFr                       SFr 909,566   SFr 6,278,763   SFr 909,566 SFr 6,278,763                  
Gross amount of treasury shares sold | SFr                               1,193,074 464,954                  
Share capital | SFr SFr 1,782,345   SFr 1,329,483     SFr 1,153,483 SFr 979,094         1,843,545   1,153,483   1,843,545 1,153,483   SFr 1,329,483     SFr 1,153,483 SFr 979,094 SFr 652,730 SFr 652,730  
Number of new shares issued 45,286,185                                                  
Number of shares issued from conditional capital 29,986,185                                                  
Strike price of equity incentive units | SFr / shares   SFr 0.043           SFr 0.13                                    
Number of equity incentive units exercised | EquityInstruments               17,438,883                                    
Other equity interest | SFr                       64,620,223   64,620,223   64,620,223 64,620,223               SFr 64,600,000  
Share issuance cost | SFr                               SFr 30,804 SFr 288,131 SFr 1,865,475                
Addex Pharma SA                                                    
Share capital                                                    
Issue of shares-treasury shares 15,300,000   17,600,000       32,636,476       16,000,000                              
Issue price | SFr / shares SFr 0.01   SFr 0.01       SFr 0.01       SFr 1.00                              
Proportion of ownership interest in subsidiary 100.00%   100.00%               100.00%                              
Share issuance cost | SFr                     SFr 200,000                              
Kepler                                                    
Share capital                                                    
Sale of shares under sale agency agreement                               4,006,373 1,355,248                  
Issue price | SFr / shares                               SFr 0.30 SFr 0.34                  
Gross amount of treasury shares sold | SFr                               SFr 1,193,074 SFr 464,954                  
Kepler | Treasury Shares Reserve                                                    
Share capital                                                    
Treasury shares | SFr                       172,072   128,200   172,072 128,200                  
Kepler | Other financial assets                                                    
Share capital                                                    
Treasury shares | SFr                       SFr 848   SFr 3,165   SFr 848 SFr 3,165                  
One institutional investor                                                    
Share capital                                                    
Sale of shares under shelf registration       7,999,998 7,999,998       4,500,000 4,500,000                                
Exercise of pre-funded warrants                       6,120,000       23,578,950                    
Share sale price | (per share)       SFr 0.14 $ 0.16       SFr 0.27 $ 0.28                                
Number of pre-funded warrants sold       23,578,950 23,578,950       10,500,000 10,500,000                                
Warrants sale price | (per share)       SFr 0.14 $ 0.16       SFr 0.27 $ 0.28                                
Gross proceeds       SFr 4,500,000 $ 5.0       SFr 4,100,000 $ 4.2                                
Share issuance cost | SFr       SFr 200,000                                            
Number of warrants issued       31,578,948 31,578,948       15,000,000 15,000,000                                
Strike price of issued warrants | (per share)       SFr 0.15 $ 0.17       SFr 0.30 $ 0.32                                
Value of issued warrants | SFr       SFr 1,780,000         SFr 1,000,000.0                                  
Reduction in strike price of issued warrants | (per share)       SFr 0.15 $ 0.17                                          
Number of warrants issued in 2021 with reduced strike price       9,230,772 9,230,772                                          
Number of warrants issued in 2022 with reduced strike price       15,000,000 15,000,000                                          
Number of warrants held by the investor       55,809,720 55,809,720                                          
Increase (decrease) in fair value of warrants due to amendment in exercise conditions | SFr       SFr 960,000                                            
Number of pre-funded warrants exercised | EquityInstruments                         3,960,000 6,540,000 5,478,570                      
Exercise period of issued warrants                 5 years 5 years                                
Common shares                                                    
Share capital                                                    
Number of shares at beginning of period                               115,348,311 49,272,952                  
Issue of shares-treasury shares                               32,900,000 48,636,476                  
Issue of shares-exercise ESOP & ESC                               12,527,235 17,438,883                  
Exercise of pre-funded warrants                               23,578,950                    
Number of shares at end of period                       184,354,496   115,348,311   184,354,496 115,348,311 49,272,952                
Number of common shares including IFRS 2 shares                       184,354,496   115,348,311   184,354,496 115,348,311                  
Treasury shares                                                    
Share capital                                                    
Number of shares at beginning of period                               (38,214,291) (11,374,803)                  
Issue of shares-treasury shares                               (32,900,000) (48,636,476)                  
Sale of shares under shelf registration                               7,999,998 4,500,000                  
Exercise of pre-funded warrants                                 15,978,570                  
Sale of shares under sale agency agreement                               4,006,373 1,355,248                  
Net purchase of shares under liquidity agreement                               (43,872) (36,830)                  
Acquisition of shares forfeited from DSPPP                               (7,311)                    
Number of shares at end of period                       (59,159,103)   (38,214,291)   (59,159,103) (38,214,291) (11,374,803)                
Number of shares reclassed as treasury shares under IFRS 2                       (29,958,807)   (17,438,833)   (29,958,807) (17,438,833)                  
Number of shares including IFRS 2 shares                       (89,117,910)   (55,653,174)   (89,117,910) (55,653,174)                  
American Depositary Shares | One institutional investor                                                    
Share capital                                                    
Share sale price | (per share)       SFr 17.20 $ 19.00       SFr 32.69 $ 34.00                                
Warrants sale price | (per share)       17.02 18.80       32.50 33.80                                
Strike price of issued warrants | (per share)       18.11 20.00       SFr 36.54 $ 38.00                                
Reduction in strike price of issued warrants | (per share)       SFr 18.11 $ 20.00                                          
Number of warrants held by the investor       465,081 465,081