DUVADILAN is a peripheral vasodilator and uterine relaxant containing Isoxsuprine HCl, primarily used for:
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Peripheral vascular disorders
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Threatened preterm labor (as a tocolytic)
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Cerebral vascular insufficiency
Composition
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Active Ingredient: Isoxsuprine Hydrochloride
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Available Forms:
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Tablets: 10 mg, 20 mg
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Injection: 10 mg/2 mL ampoule
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Excipients (tablet form):
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Lactose monohydrate
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Microcrystalline cellulose
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Magnesium stearate
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Mechanism of Action
✔ β2-adrenergic agonist:
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Relaxes vascular smooth muscle → peripheral vasodilation
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Reduces uterine contractions → tocolytic effect
✔ Additional Effects:
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Mild positive inotropic action on heart
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Inhibition of platelet aggregation
Dosage & Administration
For Peripheral Vascular Disorders
Form | Dosage | Frequency |
---|---|---|
Oral | 10-20 mg | 3-4 times daily |
IM | 5-10 mg | 2-3 times daily |
For Threatened Preterm Labor
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IV Infusion: 0.5-1 mg/min initially, then 0.1-0.2 mg/min maintenance
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IM: 10 mg every 3-6 hours
Administration Notes
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Oral: Take before meals for better absorption
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Parenteral: Monitor maternal heart rate during tocolysis
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Max Daily Dose: 120 mg (oral), 40 mg (parenteral)
Indications
✅ Peripheral vascular diseases:
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Raynaud’s phenomenon
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Arteriosclerosis obliterans
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Diabetic vascular disease
✅ Obstetric use:
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Threatened abortion
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Premature labor
✅ Neurological use:
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Cerebral vascular insufficiency
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Vascular dementia
Storage & Stability
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Tablets: Store below 30°C, protect from moisture
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Injection: Store at room temperature (15-25°C)
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Protect from light for both forms
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Shelf life: Typically 3 years
Key Recommendations
✔ For vascular disorders:
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Combine with physical therapy for best results
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Monitor peripheral pulses and skin temperature
✔ For tocolysis:
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Use with fetal monitoring
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Limit duration to 48-72 hours
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Combine with corticosteroids for fetal lung maturation
✔ General precautions:
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Monitor blood pressure (may cause hypotension)
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Assess for tachycardia (dose-dependent effect)
Important Safety Notes
⚠ Contraindications:
❌ Immediate postpartum period
❌ Severe coronary artery disease
❌ Recent arterial hemorrhage
❌ Hypersensitivity to sympathomimetics
⚠ Adverse Effects:
Common (≥5%) | Serious (<1%) |
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Tachycardia | Severe hypotension |
Dizziness | Myocardial ischemia |
Nausea | Pulmonary edema |
Flushing | Uterine atony |
⚠ Drug Interactions:
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β-blockers: Antagonize effects
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Other vasodilators: Enhanced hypotensive effect
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MAO inhibitors: Potentiate action
Comparison with Similar Agents
Feature | DUVADILAN | Nifedipine | Ritodrine |
---|---|---|---|
Primary Use | Vascular/OB | OB | OB |
Mechanism | β2-agonist | Ca²⁺ blocker | β2-agonist |
Cardiac Effects | ++ | + | +++ |
Oral Bioavailability | 50% | 90% | 30% |
Patient Counseling
✔ For vascular patients:
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Report palpitations or severe dizziness
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Avoid sudden position changes
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Importance of smoking cessation
✔ For obstetric use:
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Recognize preterm labor signs
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Understand medication purpose and limitations
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Report chest pain or breathing difficulty
Conclusion
DUVADILAN remains a versatile vasodilator with unique obstetric applications, though its use in preterm labor has diminished with newer tocolytics. Requires careful cardiovascular monitoring in all indications.
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