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# Isoxsuprine hydrochloride ## Overview Isoxsuprine hydrochloride is a vasodilating beta-adrenergic agonist. Its mechanism of action involves direct relaxation of vascular smooth muscle, leading to peripheral vasodilation. ## Primary Indications * Adjunctive therapy for peripheral vascular diseases such as arteriosclerosis obliterans, intermittent claudication, and Raynaud's disease. (Note: Efficacy is controversial, and its use is not widely supported by current evidence for many indications). ## Adult Dosing * **Intermittent Claudication/Peripheral Vascular Disease:** 10 mg to 20 mg orally 3 to 4 times daily. * Maximum dose is generally not to exceed 80 mg per day. ## Pediatric Dosing * No established pediatric dosing. Use is generally not recommended in children due to lack of safety and efficacy data. ## Dose Adjustments * No specific dose adjustments are routinely recommended for renal or hepatic impairment. However, caution should be exercised, and lower doses may be considered. ## Contraindications * Individuals with known hypersensitivity to isoxsuprine. * Concomitant administration with epinephrine (may cause paradoxical pressor response). * Tachyarrhythmias. * Hypertension. * Use in patients with recent myocardial infarction or heart failure. ## Adverse Effects * **Common:** Hypotension, flushing, dizziness, nausea, vomiting, abdominal distress, rash. * **Less Common:** Tachycardia, palpitations, weakness, nervousness. ## Key Drug Interactions * **Epinephrine:** May cause a paradoxical increase in blood pressure and decrease in heart rate. Avoid concurrent use. * **Antihypertensives:** Isoxsuprine's vasodilating effects may potentiate the hypotensive effects of antihypertensive medications. ## Monitoring * Blood pressure and heart rate. * Symptoms related to peripheral vascular disease (e.g., pain, claudication). * Signs of adverse effects. ## Clinical Pearls * Efficacy for peripheral vascular disease is not well-established and has been questioned in numerous reviews. * Onset of action is typically within 30 minutes to 1 hour. * Effects may be reduced by smoking. * Administer with food or milk to minimize gastrointestinal upset. *** *This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always verify current prescribing information and consult with a qualified healthcare provider before making any treatment decisions.*