Antiasthmatic activity of the methanol extract of leaves of Passiflora incarnata

Phytother Res. 2003 Aug;17(7):821-2. doi: 10.1002/ptr.1151.


The methanol extract of the leaves of P. incarnata was evaluated for its antiasthmatic effects against acetylcholine chloride (Ach)-induced-bronchospasm in guinea-pigs at doses of 50, 100 and 200 mg/kg. Using a 7-day treatment regimen, significant prevention of dyspnoea-related-convulsions was noted in the animals treated with a 100 mg/kg dose of this extract. No preventive effect was exhibited by the 50 mg/kg dose and at a higher dose, i.e. 200 mg/kg, the preventive effects against Ach-chloride-induced-dyspnoea were also reduced. This may be due to defective alpha-adrenoceptor function reported after excessive or continuous administration of an alpha-receptor agonist.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acetylcholine
  • Animals
  • Anti-Asthmatic Agents / administration & dosage
  • Anti-Asthmatic Agents / pharmacology*
  • Anti-Asthmatic Agents / therapeutic use
  • Bronchial Spasm / chemically induced
  • Bronchial Spasm / prevention & control*
  • Dose-Response Relationship, Drug
  • Female
  • Guinea Pigs
  • Male
  • Passiflora*
  • Phytotherapy*
  • Plant Extracts / administration & dosage
  • Plant Extracts / pharmacology*
  • Plant Extracts / therapeutic use
  • Plant Leaves


  • Anti-Asthmatic Agents
  • Plant Extracts
  • Acetylcholine