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# Isoxsuprine Hydrochloride ## Overview Isoxsuprine hydrochloride is a peripheral vasodilator that acts directly on blood vessels, causing relaxation and vasodilation. It also has some beta-adrenergic effects. ## Primary Indications * Treatment of peripheral vascular disease, including intermittent claudication and vasospastic disorders. * Historically used to reduce preterm labor (tocolytic), but efficacy and safety are not well-established for this indication. ## Adult Dosing * **Peripheral Vascular Disease:** 10-20 mg orally 3 to 4 times daily. Doses may be increased gradually up to 40 mg four times daily. ## Pediatric Dosing No established pediatric dosing recommendations. Use is generally not recommended due to lack of data. ## Dose Adjustments No specific dose adjustments are typically required for renal or hepatic impairment, though caution is advised due to potential for altered metabolism and excretion. ## Contraindications * Hypersensitivity to isoxsuprine hydrochloride. * Should not be used intravenously. * Use with extreme caution in patients with hypotension or tachycardia. ## Adverse Effects * **Common:** Flushing, nausea, vomiting, dizziness, weakness, headache, rash, epigastric distress, hypotension, tachycardia. * **Less Common:** Blurred vision, nervousness, abdominal cramps, drowsiness. ## Key Drug Interactions * **Antihypertensives:** May potentiate hypotensive effects. * **Other Vasodilators:** Additive vasodilatory effects may lead to excessive hypotension. ## Monitoring * Blood pressure and heart rate. * Signs and symptoms of peripheral vascular disease. * For tocolytic use, monitor uterine contractions and fetal well-being. ## Clinical Pearls * The efficacy of isoxsuprine for peripheral vascular disease is debated, and its use is limited. * Due to the potential for hypotension and tachycardia, patients should be advised to rise slowly from a sitting or lying position. * For tocolytic use, use is generally reserved for situations where other agents are contraindicated or ineffective, and requires close maternal and fetal monitoring. *** *Disclaimer: This information is intended for healthcare professionals and does not replace individual clinical judgment or the most current prescribing information. Always consult the official product monograph and relevant clinical guidelines before prescribing or administering any medication.*