Pentoxifylline
Also known as: Trental
* **Administration**: Give this medication **with food** to significantly reduce the chance of stomach upset (vomiting or loss of appetite). * **Patience is Key**: For skin and vascular conditions, it may take **several weeks (up to 6-8 weeks)** to see noticeable improvement. Do not stop the medication early unless directed by your veterinarian. * **Side Effects**: Watch for vomiting, diarrhea, or unusual nervousness/excitement. Contact your vet if these occur. * **Expectations**: Clients should understand that veterinary experience with this medication is limited and that the risk versus benefit profile is not completely defined.
Dosage must be set by your veterinarian for your specific pet. Never give human medication or another pet’s prescription without veterinary guidance.
What it is used for
- Vasculitis (off-label)
- Cutaneous vasculitis / General
- Adjunctive treatment to prevent GI thrombosis
- To reduce cytokine effects in endotoxemia
- To reduce cytokine effects in endotoxemia
- Adjunctive treatment (experimental) of sepsis in foals
- Adjunctive treatment of equine pastern dermatitis
- To increase oxygenation of placenta in placentitis
- To increase the circulation to the podotrochlea
- Dermatologic conditions (e.g., dermatomyositis, ear margin seborrhea/necrosis, ulcerative dermatitis of collies/shelties, contact dermatitis, atopy and any disease with underlying vasculitis)
- Atopic dermatitis
- Dermatologic disorders including dermatomyositis, vasculitis, erythema multiforme, cutaneous and renal vasculitis of Greyhounds (Alabama rot), and allergic contact dermatitis
How it is given
Possible side effects
- Vomiting
- Inappetence
- Loose stools
- Excitement
- Nervousness
- Dizziness (humans)
- Headache (humans)
- Erythema multiforme (rare in dogs)
- Transient leukocytosis (horses IV)
- Muscle fasciculations (horses IV)
- Sweating on shoulders/flanks (horses IV)
- Mild increases in heart rate (horses IV)
- Anorexia
- Diarrhea
Cautions & contraindications
- Intolerance or hypersensitivity to pentoxifylline or other xanthines (e.g., theophylline, caffeine, theobromine)
- Cerebral hemorrhage
- Retinal hemorrhage
- Hypersensitivity to methylxanthines (e.g., theophylline, caffeine)
- Cerebral or retinal hemorrhage
- Severe hepatic or renal impairment (use with caution)
- > **Caution** in patients with severe hepatic or renal impairment, or those at risk for hemorrhage. * **Pregnancy**: FDA Category C. May be teratogenic at high dosages. * **Nursing**: Excreted in maternal milk. Use cautiously in nursing patients due to potential tumorigenicity seen in rats.
Drug interactions
- Antihypertensive drugs: May increase hypotensive effect when used concurrently
- NSAIDs: Controversial in horses; may negate beneficial effects for endotoxemia, though some studies show superior efficacy when used with flunixin
- Platelet-aggregation inhibitors (e.g., aspirin, clopidogrel): Increased risk for bleeding
- Theophylline: Serum levels of theophylline may be increased when used concurrently
- Warfarin: Increased risk of bleeding; use together with enhanced monitoring and caution
- Ciprofloxacin: May increase pentoxifylline levels
- Antihypertensives: Potential for additive hypotensive effects
Frequently asked questions
What is Pentoxifylline used for in pets?
* **Administration**: Give this medication **with food** to significantly reduce the chance of stomach upset (vomiting or loss of appetite). * **Patience is Key**: For skin and vascular conditions, it may take **several weeks (up to 6-8 weeks)** to see noticeable improvement. Do not stop the medication early unless directed by your veterinarian. * **Side Effects**: Watch for vomiting, diarrhea, or unusual nervousness/excitement. Contact your vet if these occur. * **Expectations**: Clients should understand that veterinary experience with this medication is limited and that the risk versus benefit profile is not completely defined.
Is Pentoxifylline safe for my pet?
Dosage must be set by your veterinarian for your specific pet. Never give human medication or another pet’s prescription without veterinary guidance.
This article is for general education and is not a substitute for professional veterinary advice. If your pet is unwell, please consult a veterinarian.
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