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# Isoxsuprine Hydrochloride
## Overview
Isoxsuprine hydrochloride is a vasodilator with beta-adrenergic agonist activity. It is thought to relax smooth muscle in blood vessels, leading to vasodilation and improved peripheral circulation.
## Primary Indications
* Treatment of peripheral vascular disease, such as intermittent claudication and Raynaud's disease.
* Historically used to prevent premature labor (tocolytic), but this use is generally not recommended due to risks and availability of more effective agents.
## Adult Dosing
* **Peripheral Vascular Disease:** 10 mg to 20 mg orally every 3 to 4 times daily.
* **Maximum Dose:** Doses up to 40 mg orally every 3 to 4 times daily have been used, but higher doses may increase the risk of adverse effects.
## Pediatric Dosing
There is no established pediatric dosing for isoxsuprine hydrochloride. Its use in children is generally not recommended.
## Dose Adjustments
* **Hepatic Impairment:** No specific guidelines are available, but caution is advised as the drug is metabolized in the liver.
* **Renal Impairment:** No specific guidelines are available, but caution is advised as the drug and its metabolites are renally excreted.
## Contraindications
* Hypersensitivity to isoxsuprine hydrochloride.
* Use in patients with a history of glaucoma.
* Use in patients with recent myocardial infarction.
* Use in patients with cardiac arrhythmias or tachyarrhythmias.
## Adverse Effects
* **Cardiovascular:** Hypotension, tachycardia, flushing, dizziness, lightheadedness.
* **Gastrointestinal:** Nausea, vomiting, abdominal distress, constipation.
* **Neurological:** Weakness, nervousness.
* **Other:** Rash, blurred vision.
## Key Drug Interactions
* **Antihypertensives:** Isoxsuprine may potentiate the hypotensive effects of antihypertensive medications.
* **Sympathomimetic Agents:** Concomitant use may increase the risk of cardiovascular side effects.
## Monitoring
* Blood pressure and heart rate.
* Signs and symptoms of peripheral vascular disease.
* Patient-reported adverse effects.
## Clinical Pearls
* The efficacy of isoxsuprine for peripheral vascular disease is not definitively established, and its use is limited.
* Patients should be advised to rise slowly from a sitting or lying position to minimize orthostatic hypotension.
* Discontinue if paradoxical vasospasm occurs.
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**Disclaimer:** This information is intended for healthcare professionals and is not a substitute for professional medical advice. Always consult the most current prescribing information and clinical guidelines for definitive recommendations, as drug information can change. Verify current prescribing information for isoxsuprine hydrochloride before use.
