Skip to Content


In the US, Dihydrotachysterol is a member of the drug class vitamins and is used to treat Hypocalcemia, Hypoparathyroidism, Hypophosphatemia, Osteoporosis, Renal Osteodystrophy and Rickets.



ATC (Anatomical Therapeutic Chemical Classification)


CAS registry number (Chemical Abstracts Service)


Chemical Formula


Molecular Weight


Therapeutic Categories

Treatment of hypoparathyroidism

Vitamin D analogue

Chemical Name

9,10-Secoergosta-5,7,22-trien-3-ol, (3β,5E,7E,10α,22E)-

Foreign Names

  • Dihydrotachysterolum (Latin)
  • Dihydrotachysterol (German)
  • Dihydrotachystérol (French)
  • Dihidrotaquisterol (Spanish)

Generic Names

  • Dihydrotachysterol (OS: JAN, BAN)
  • Dihydrotachystérol (OS: DCF)
  • Diidrotachiserolo (OS: DCIT)
  • DHT (IS)
  • Dichysterol (IS)
  • Dihydrotachysterin (IS)
  • Vitamin D (IS)
  • Dihydrotachysterol (PH: BP 2016, Ph. Eur. 8, USP 38)
  • Dihydrotachysterolum (PH: Ph. Eur. 8)

Brand Names

  • A T
    Merck, Egypt
  • A.T. 10
    Teofarma, Switzerland
  • AT10
    Intrapharm Laboratories, United Kingdom
  • Atiten
    Bayer, Italy
  • Cal-OS Plus D (Dihydrotachysterol and Calcium Carbonate)
    Siam Bheasach, Thailand
  • Dihydral
    Dishman, Netherlands
  • Dygratyl
    Dishman, Finland; Dishman, Sweden
  • Euro D
    Euro Pharm, Lebanon; Euro Pharm, Lebanon
  • Mega-Cal (Dihydrotachysterol and Calcium)
    Jamieson Lab, Hong Kong
  • Os-Cal +D (Dihydrotachysterol and Calcium Carbonate)
    Sanofi-Aventis, Hong Kong
  • Tachystin
    Chauvin, Lithuania
  • Vandol (Dihydrotachysterol and Retinol)
    Organon, Philippines


BANBritish Approved Name
DCFDénomination Commune Française
DCITDenominazione Comune Italiana
ISInofficial Synonym
JANJapanese Accepted Name
OSOfficial Synonym
PHPharmacopoeia Name
Rec.INNRecommended International Nonproprietary Name (World Health Organization)

Further information on drug naming conventions: International Nonproprietary Names.

Important Notice: The international database is in BETA release. This means it is still under development and may contain inaccuracies. It is not intended as a substitute for the expertise and judgement of your physician, pharmacist or other healthcare professional. It should not be construed to indicate that the use of any medication in any country is safe, appropriate or effective for you. Consult with your healthcare professional before taking any medication.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.