Propentofylline
Propentofylline is a xanthine derivative primarily used in veterinary medicine to improve peripheral and cerebral vascular blood flow. It is commonly prescribed for older dogs to manage age-related cognitive dysfunction (canine cognitive dysfunction) and lethargy. **Clinical Pearl:** While it improves blood flow and has mild bronchodilatory effects, it is most frequently utilized to improve the demeanor, mental alertness, and activity levels of geriatric dogs.
Mechanism: Propentofylline acts primarily via the **inhibition of phosphodiesterase (PDE)**, which increases intracellular cAMP levels. * **Vasodilation:** Increases blood flow to the heart, skeletal muscle, and central nervous system (CNS). * **Cardiac effects:** Exhibits positive inotropic (increased contractility) and chronotropic (increased heart rate) effects, alongside mild antiarrhythmic properties. * **Respiratory effects:** Acts as a bronchodilator. * **Hematologic effects:** Inhibits platelet aggregation and reduces peripheral vascular resistance.
Dosing by species
- Dullness, lethargy, and depressed demeanor in older dogs (Canine Cognitive Dysfunction) · 3-5 mg/kg · PO · q12h · Long-term · Administer 30 minutes before feeding for optimal absorption.
Doses are a clinical reference for licensed veterinary professionals. Always confirm against the current label and the individual patient.
Routes of administration
Contraindications
- Pregnant or lactating animals
- Breeding animals
- Severe cardiac disease (use with caution)
Adverse effects
- Vomiting
- Diarrhea
- Anorexia
- Tachycardia
- Restlessness
- Allergic reactions (rare)
Drug interactions
- Sympathomimetics · Increased risk of cardiac arrhythmias and excessive CNS stimulation · moderate
- Theophylline · Increased plasma concentrations and risk of xanthine toxicity · major
Monitoring
- Clinical response (improvement in demeanor/activity)
- Heart rate and rhythm
- Gastrointestinal signs
Overdose
Overdose may lead to exaggerated pharmacological effects, including **tachycardia**, **hypotension**, **restlessness**, **tremors**, and **gastrointestinal distress** (vomiting). Treatment is supportive and symptomatic.
VetSheet drug reference is intended for licensed veterinary professionals as a clinical decision-support aid, not a substitute for professional judgement or the manufacturer’s current label.