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Common Stock, Stock Options and Warrants - Schedule of Option Activity Under Our Stock Option Plans (Details) - Stock Option Plans [Member] - USD ($)
 9 Months Ended
Sep. 30, 2024
Jun. 30, 2025
Schedule of Option Activity Under Our Stock Option Plans [Line Items]    
Option Shares, Outstanding Ending balance 656,084 839,510
Weighted- Average Exercise Price, Outstanding Ending balance $ 36.41 $ 30.09
Weighted- Average Remaining Contractual Term Outstanding Ending balance 7 years 3 months 3 days 7 years 1 month 24 days
Aggregate Intrinsic Value, Outstanding Ending balance $ 0 $ 0
Shares, Outstanding Exercisable   512,009
Weighted- Average Exercise Price, Exercisable   $ 39.73
Weighted- Average Remaining Contractual Term, Exercisable   6 years 1 month 17 days
Aggregate Intrinsic Value, Exercisable   $ 0
Option Shares, Granted   185,000
Weighted- Average Exercise Price, Granted   $ 9.5
Option Shares, Exercised  
Weighted- Average Exercise Price, Exercised  
Option Shares, Forfeited or expired   (1,574)
Weighted- Average Exercise Price, Forfeited or expired   $ 242.8
Citius Oncology [Member]    
Schedule of Option Activity Under Our Stock Option Plans [Line Items]    
Option Shares, Outstanding Ending balance 12,750,000 18,166,667
Weighted- Average Exercise Price, Outstanding Ending balance $ 2.15 $ 1.82
Weighted- Average Remaining Contractual Term Outstanding Ending balance 8 years 9 months 10 days 8 years 5 months 4 days
Aggregate Intrinsic Value, Outstanding Ending balance $ 0 $ 46,051,667
Shares, Outstanding Exercisable   5,554,167
Weighted- Average Exercise Price, Exercisable   $ 1.99
Weighted- Average Remaining Contractual Term, Exercisable   8 years 1 month 17 days
Aggregate Intrinsic Value, Exercisable   $ 13,098,333
Option Shares, Granted   5,750,000
Weighted- Average Exercise Price, Granted   $ 1.07
Option Shares, Forfeited or expired   (333,333)
Weighted- Average Exercise Price, Forfeited or expired   $ 1.74