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Benazepril structure.svg
Clinical data
Trade namesLotensin, others
Routes of
ATC code
Legal status
Legal status
  • In general: ℞ (Prescription only)
Pharmacokinetic data
Protein binding96.7%
MetabolismLiver glucuronidation
Elimination half-life10-11 hours
ExcretionKidney and biliary
  • 2-[(3S)-3-[[(2S)-1-ethoxy-1-oxo-4-phenylbutan-2-yl]amino]-2-oxo-4,5-dihydro-3H-1-benzazepin-1-yl]acetic acid
CAS Number
PubChem CID
CompTox Dashboard (EPA)
Chemical and physical data
Molar mass424.497 g·mol−1
3D model (JSmol)
  • O=C(OCC)[C@@H](N[C@@H]2C(=O)N(c1ccccc1CC2)CC(=O)O)CCc3ccccc3
  • InChI=1S/C24H28N2O5/c1-2-31-24(30)20(14-12-17-8-4-3-5-9-17)25-19-15-13-18-10-6-7-11-21(18)26(23(19)29)16-22(27)28/h3-11,19-20,25H,2,12-16H2,1H3,(H,27,28)/t19-,20-/m0/s1 checkY

Benazepril, sold under the brand name Lotensin among others, is a medication used to treat high blood pressure, heart failure, and diabetic kidney disease.[1] It is a reasonable initial treatment for high blood pressure.[1] It is taken by mouth.[1] Versions are available as the combinations benazepril/hydrochlorothiazide and benazepril/amlodipine.[1]

Common side effects include feeling tired, dizziness, cough, and light-headedness with standing.[1] Serious side effects may include kidney problems, low blood pressure, high blood potassium, and angioedema.[1] Use in pregnancy may harm the baby, while use when breastfeeding may be safe.[2] It is an ACE inhibitor and works by decreasing renin-angiotensin-aldosterone system activity.[1]

Benazepril was patented in 1981 and came into medical use in 1990. It was created by the chemist Mahesh Desai[3] It is available as a generic medication.[1] In 2019, it was the 130th most commonly prescribed medication in the United States, with more than 5 million prescriptions.[4][5]

Structure Activity Relationship[edit]

Benazepril Hydrochloride's OCh2Ch3 group must be metabolized in order to inhibit the ACE Enzyme to form Benazeprilat, which is the active form of the molecule. The bulky cyclic structure is resistant to hydrolysis. A special note about the molecule is that the nitrogen within the ring makes the bulky cyclic structure especially harder to break down, and can account for the drug's PK profile, in which the duration of action is 24 hours.

Medical uses[edit]

It is useful for high blood pressure, heart failure, and diabetic kidney disease.[1] It is a reasonable initial treatment for high blood pressure.[1] Other reasonable initial options include angiotensin II receptor antagonists, calcium-channel blockers, and thiazide diuretics.[1]

Side effects[edit]

The most common side effects patients experience are a headache or a chronic cough. The chronic cough develops in about 20% of patients treated,[6] and those patients that experience it find it develops after a few months of use. Anaphylaxis, angioedema, and elevation of potassium levels are more serious side effects that can also occur.


Benazepril should be discontinued during pregnancy and in women planning to become pregnant, as it can harm the fetus.[7]

Dosage forms[edit]

It is also available in combination with hydrochlorothiazide, under the trade name Lotensin HCT, and with amlodipine (Lotrel).

Veterinary use[edit]

Under the brand names Fortekor (Novartis) and VetACE (Jurox Animal Health),[citation needed] benazepril is used to treat congestive heart failure in dogs[8][9] and chronic kidney failure in cats and dogs.[10]


  1. ^ a b c d e f g h i j k "Benazepril Hydrochloride Monograph for Professionals". American Society of Health-System Pharmacists. Retrieved 3 March 2019.
  2. ^ "Benazepril Pregnancy and Breastfeeding Warnings". Retrieved 3 March 2019.
  3. ^ Fischer, Jnos; Ganellin, C. Robin (2006). Analogue-based Drug Discovery. John Wiley & Sons. p. 468. ISBN 9783527607495.
  4. ^ "The Top 300 of 2019". ClinCalc. Retrieved 16 October 2021.
  5. ^ "Benazepril - Drug Usage Statistics". ClinCalc. Retrieved 16 October 2021.
  6. ^ Dykewicz, Mark S. (April 2004). "Cough and Angioedema From Angiotensin-Converting Enzyme Inhibitors: New Insights Into Mechanisms and Management". Medscape. Retrieved 2 April 2014.
  7. ^ "Lotensin package insert" (PDF). FDA. 2011. Retrieved 2020-12-09.
  8. ^ King JN, Mauron C, Kaiser G (December 1995). "Pharmacokinetics of the active metabolite of benazepril, benazeprilat, and inhibition of plasma angiotensin-converting enzyme activity after single and repeated administrations to dogs". Am. J. Vet. Res. 56 (12): 1620–8. PMID 8599524.
  9. ^ O'Grady MR, O'Sullivan ML, Minors SL, Horne R (2009). "Efficacy of benazepril hydrochloride to delay the progression of occult dilated cardiomyopathy in Doberman Pinschers". J. Vet. Intern. Med. 23 (5): 977–83. doi:10.1111/j.1939-1676.2009.0346.x. PMID 19572914.
  10. ^ "Fortekor Flavor Tabs (5 mg) (Canada) for Animal Use". Retrieved 2020-12-09.

External links[edit]

  • "Benazepril". Drug Information Portal. U.S. National Library of Medicine.