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# Isoxsuprine hydrochloride
## Overview
Isoxsuprine hydrochloride is a peripheral vasodilator. Its mechanism of action is not fully understood but is thought to involve direct relaxation of vascular smooth muscle, leading to vasodilation.
## Primary Indications
* Treatment of peripheral vascular diseases, such as intermittent claudication, arteriosclerosis obliterans, and Raynaud's disease.
* Historically used to prevent premature labor (tocolytic), but this use is largely unsupported by current evidence and not recommended.
## Adult Dosing
* **Intermittent Claudication/Peripheral Vascular Disease:** The usual dose is 10-20 mg orally three to four times daily.
* Maximum dose is typically 20 mg four times daily.
## Pediatric Dosing
* No established pediatric dosing. Use is not generally recommended in children.
## Dose Adjustments
* No specific dose adjustments are routinely recommended for renal or hepatic impairment, but caution is advised.
## Contraindications
* Hypersensitivity to isoxsuprine hydrochloride.
* Use in patients with congenital heart defects.
* Use in patients who have had a recent myocardial infarction.
## Adverse Effects
* **Common:** Hypotension, dizziness, lightheadedness, nausea, vomiting, stomach upset, rash, flushing.
* **Less Common:** Palpitations, weakness, blurred vision.
## Key Drug Interactions
* **Antihypertensives:** Isoxsuprine may potentiate the hypotensive effects of antihypertensive medications.
* **Other Vasodilators:** Concurrent use with other vasodilators may increase the risk of hypotension.
## Monitoring
* Blood pressure: Monitor for hypotension, especially at the initiation of therapy and dose increases.
* Symptoms of peripheral vascular disease: Assess for improvement in walking distance and other symptoms.
## Clinical Pearls
* The efficacy of isoxsuprine in peripheral vascular disease is controversial, and it is not considered a first-line therapy.
* Patients should be advised to rise slowly from a sitting or lying position to minimize orthostatic hypotension.
* Due to the lack of robust efficacy data for many of its historical uses, discuss treatment goals and alternatives with patients.
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**Disclaimer:** This information is intended for healthcare professionals. Always consult the most current prescribing information and institutional guidelines before making clinical decisions. Drug information is subject to change.
