Spirapril

ACE Inhibitor (angiotensin Converting Enzyme Inhibitor); Prodrug (esterified Dipeptide Mimetic)Rx: PrescriptionCompound: Approved

Also known as: Renormax, SCH-33861

Educational Only — Not medical advice. Consult a qualified clinician before using any peptide.

Summary

Spirapril is an ACE inhibitor prodrug used in the treatment of hypertension. It is converted in vivo to its active diacid form, spiraprilat. It has a long duration of action and is excreted via both renal and hepatic routes, making it potentially useful in patients with renal impairment.

Mechanism of Action

Spirapril is a prodrug hydrolyzed to spiraprilat, which competitively inhibits angiotensin-converting enzyme (ACE), blocking conversion of angiotensin I to angiotensin II. This reduces vasoconstriction and aldosterone secretion, lowering blood pressure.

Routes of Administration

Oral

Goals & Uses

  • Heart failureCardiovascularLow
  • Hypertension managementCardiovascularHigh
  • Renoprotection in chronic kidney diseaseNephrologyLow

Contraindications

  • PregnancyPopulationHighPotential fetal risk or insufficient safety data
  • History of ACE inhibitor-induced angioedemaImmunologic/AllergicHigh
  • Severe hypersensitivity to spirapril or excipientsAllergyHigh
  • Concurrent use of aliskiren in diabetic patientsDrug InteractionHigh
  • Bilateral renal artery stenosisVascular/RenalHigh

Adverse Effects

  • Hypotension (first-dose effect)CardiovascularCommon
  • Renal impairmentRenalUncommon
  • HyperkalemiaElectrolyte ImbalanceUncommon
  • Dry coughRespiratoryCommon
  • AngioedemaImmunologicRare
  • Dizziness/headacheNeurologicalCommon

Drug Interactions

  • Potassium-sparing diuretics (e.g., spironolactone, amiloride)High
  • AliskirenHigh
  • NSAIDsModerateMay increase renal risk in susceptible patients
  • Antidiabetic agents (insulin, sulfonylureas)Moderate
  • LithiumHigh

Population Constraints

  • Pediatric patientsAgeRelative
  • Patients with severe renal artery stenosisRenalAbsolute
  • Patients with severe hepatic impairmentHepaticRelative
  • Elderly patientsAgeRelative
  • Pregnant womenReproductiveAbsolute

Regulatory Status

  • European UnionApprovedApproved: HypertensionApproved in select EU member states (e.g., Scandinavia, some Eastern European countries) under brand name Renormax.
  • United StatesUnapprovedNot approved by the FDA; no NDA filed or approved.
  • United KingdomUnknownLimited availability data post-Brexit; not a commonly listed product in MHRA databases.

Approved in several European countries for hypertension. Not approved by the FDA in the United States. Available in limited markets.

Evidence & Sources

No sources recorded yet.