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In some countries, this medicine may only be approved for veterinary use.

In the US, Tolazoline is a member of the drug class miscellaneous cardiovascular agents.



ATC (Anatomical Therapeutic Chemical Classification)


CAS registry number (Chemical Abstracts Service)


Chemical Formula


Molecular Weight


Therapeutic Categories

Peripheral vasodilator

α-adrenoceptor antagonist (alpha-blocker)

Treatment of pulmonary hypertension

Chemical Name

1H-Imidazole, 4,5-dihydro-2-(phenylmetyl)-

Foreign Names

  • Tolazolinum (Latin)
  • Tolazolin (German)
  • Tolazoline (French)
  • Tolazolina (Spanish)

Generic Names

  • Tolazoline (OS: BAN, DCF)
  • Benzazolin (IS)
  • Tolazoline Hydrochloride (OS: BANM, JAN)
  • Benzazoline hydrochloride (IS)
  • Tolazolina cloridrato (PH: F.U. IX)
  • Tolazoline Hydrochloride (PH: BP 1980, USP 41)

Brand Names

  • Tolazine [veterinary use]
    Akorn Animal Health, United States; Bayer Australia Ltd Animal Health, Australia; Lloyd, New Zealand


BANBritish Approved Name
BANMBritish Approved Name (Modified)
DCFDénomination Commune Française
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.