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# Isoxsuprine Hydrochloride
## Overview
Isoxsuprine hydrochloride is a vasodilator historically used to improve cerebral and peripheral blood flow. Its efficacy for most indications is not well-established by robust clinical trial data.
## Primary Indications
* **Intermittent Claudication:** Historically used to improve walking distance in patients with peripheral vascular disease. Evidence supporting its efficacy is limited and controversial.
* **Cerebral Vascular Insufficiency:** Previously used for conditions associated with impaired brain circulation, though efficacy is not well-supported.
**Note:** Isoxsuprine is not FDA-approved for any indication and is not widely used due to a lack of strong evidence of efficacy and the availability of more effective treatments.
## Adult Dosing
* **Intermittent Claudication:**
* Initial dose: 10-20 mg orally three to four times daily.
* Maintenance dose: 20 mg orally four times daily.
* Maximum: Not well-defined, but typical total daily doses range from 40 mg to 80 mg.
## Pediatric Dosing
* No established pediatric dosing. Its use in children is not recommended due to lack of data.
## Dose Adjustments
* No specific dose adjustments for renal or hepatic impairment are established. Use with caution and consider reduced dosage if significant impairment exists.
## Contraindications
* Hypersensitivity to isoxsuprine hydrochloride.
* Individuals where a rapid drop in blood pressure would be dangerous (e.g., recent myocardial infarction, arrhythmia, glaucoma, severe arteriosclerosis).
## Adverse Effects
* **Common:** Nausea, vomiting, gastrointestinal distress, dizziness, weakness, flushing, rash.
* **Serious:** Hypotension, tachycardia, palpitations, drowsiness, nervousness.
## Key Drug Interactions
* **Antihypertensives:** Isoxsuprine may potentiate the effects of antihypertensive medications, leading to significant hypotension. Monitor blood pressure closely.
* **Other Vasodilators:** Concurrent use may increase the risk of hypotension.
## Monitoring
* Blood pressure and heart rate.
* Symptoms of peripheral vascular disease (e.g., walking distance, pain).
* Signs of adverse effects.
## Clinical Pearls
* Efficacy for its primary indications is questionable and not supported by high-quality evidence.
* Consider alternative therapies with proven efficacy for peripheral vascular disease or cerebrovascular insufficiency.
* Administer with meals to minimize gastrointestinal upset.
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**Disclaimer:** This information is intended for clinical professionals and is not a substitute for a comprehensive review of the most current prescribing information and clinical guidelines. Always verify drug information with up-to-date resources before patient administration.
