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Document And Entity Information - USD ($)
 12 Months Ended
Sep. 30, 2021
Nov. 30, 2021
Mar. 31, 2021
Document Information Line Items      
Entity Registrant Name Citius Pharmaceuticals, Inc.    
Trading Symbol CTXR    
Document Type 10-K    
Current Fiscal Year End Date --09-30    
Entity Common Stock, Shares Outstanding   146,029,630  
Entity Public Float     $ 218,000,000
Amendment Flag false    
Entity Central Index Key 0001506251    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Non-accelerated Filer    
Entity Well-known Seasoned Issuer No    
Document Period End Date Sep. 30, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Document Annual Report true    
Document Transition Report false    
Entity File Number 001-38174    
Entity Incorporation, State or Country Code NV    
Entity Tax Identification Number 27-3425913    
Entity Address, Address Line One 11 Commerce Drive    
Entity Address, Address Line Two First Floor    
Entity Address, City or Town Cranford    
Entity Address, State or Province NJ    
Entity Address, Postal Zip Code 07016    
City Area Code (908)    
Local Phone Number 967-6677    
Title of 12(b) Security Common Stock, par value $0.001 per share    
Security Exchange Name NASDAQ    
Entity Interactive Data Current Yes