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# Isoxsuprine Hydrochloride
## Overview
Isoxsuprine hydrochloride is a peripheral vasodilator that also has beta-adrenergic agonist properties. It is believed to work by relaxing vascular smooth muscle, leading to vasodilation.
## Primary Indications
* Treatment of peripheral vascular disease, such as intermittent claudication.
* Historically used for threatened premature labor (off-label and generally not recommended due to safety concerns and lack of efficacy compared to tocolytics).
## Adult Dosing
* **Peripheral Vascular Disease:** 10 mg to 20 mg orally three to four times daily.
* Maximum dose is generally considered to be 80 mg per day.
## Pediatric Dosing
* No established pediatric dosing. Use is not recommended.
## Dose Adjustments
* No specific dose adjustments are typically recommended for hepatic or renal impairment, but caution is advised due to potential accumulation and increased risk of adverse effects.
## Contraindications
* Hypersensitivity to isoxsuprine hydrochloride.
* Certain cardiac conditions, including recent myocardial infarction or arrhythmias.
* Hypotension.
* Pregnancy (especially for tocolytic use, where it is generally contraindicated).
## Adverse Effects
* **Common:** Nausea, vomiting, gastrointestinal distress, dizziness, headache, weakness, flushing, hypotension, tachycardia, rash.
* **Less Common:** Bromidrosis (body odor).
## Key Drug Interactions
* **Antihypertensives:** May potentiate hypotensive effects.
* **Other Vasodilators:** Additive hypotensive effects.
* **Sympathomimetic Agents:** Potential for additive cardiovascular effects (tachycardia, arrhythmias).
## Monitoring
* Blood pressure.
* Heart rate.
* Signs and symptoms of peripheral vascular disease.
* Signs of adverse effects.
## Clinical Pearls
* Efficacy in peripheral vascular disease is debated, and it is not a first-line agent.
* Its use as a tocolytic agent is largely historical and not recommended due to risks and better alternatives.
* Patients should be advised to report any dizziness, lightheadedness, or syncope.
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*Disclaimer: This information is intended for healthcare professionals. Always consult the most current prescribing information and relevant clinical guidelines before making treatment decisions. Local protocols may dictate specific dosing or management strategies.*
