v3.26.3
Cover
Oct. 09, 2026
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Oct. 09, 2026
Current Fiscal Year End Date --12-31
Entity File Number 001-43503
Entity Registrant Name Retension Pharmaceuticals, Inc.
Entity Central Index Key 0002002988
Entity Tax Identification Number 93-2592788
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 1104 West Broad Street #1029
Entity Address, City or Town Falls Church
Entity Address, State or Province VA
Entity Address, Postal Zip Code 22046
City Area Code 703
Local Phone Number 940-9761
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, $0.0001 par value per share
Trading Symbol RTSN
Security Exchange Name NASDAQ
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false