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FDA Notification Regarding Isoxsuprine Hydrochloride Drug Products

On July 15, 2020, FDA announced the final decision of the Commissioner of Food and Drugs, that Vasodilan containing isoxsuprine hydrochloride lacked substantial evidence, consisting of adequate and well-controlled studies, to be effective for specific indications. Vasodilan containing isoxsuprine hydrochloride was part of the Drug Efficacy Study Implementation process. FDA notified manufacturers and labelers of the products (see list below) on Aug. 9. 2021, to stop distributing their isoxsuprine hydrochloride drug products. As of Oct. 13, 2021, all the companies agreed to cease distribution of the unapproved isoxsuprine HCl drugs. 

FDA considers isoxsuprine hydrochloride drug products unapproved new drugs that cannot be distributed in interstate commerce without a new drug application approved by FDA. The distribution of any unapproved isoxsuprine hydrochloride drug products, not limited to the drug products listed below, is considered unlawful and subject to enforcement action.

Unapproved Isoxsuprine Hydrochloride Drug Products and NDCs 

  NDC  Product Name and Strength 
1  42582-101  Isoxsuprine hydrochloride 10 mg tablet 
2 42582-201  Isoxsuprine hydrochloride 20 mg tablet 
3 51293-605  Isoxsuprine hydrochloride 20 mg tablet 
4 51293-606  Isoxsuprine hydrochloride 10 mg tablet 
5 66576-201  Isoxsuprine hydrochloride 20 mg tablet 
6 66576-101  Isoxsuprine hydrochloride 10 mg tablet 
7 61971-065  Isoxsuprine hydrochloride 20 mg tablet 
8 42582-200  Isoxsuprine hydrochloride 20 mg tablet 
9 42582-100  Isoxsuprine hydrochloride 10 mg tablet 
10 63549-919  Isoxsuprine hydrochloride 20 mg tablet 

For more information:    

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