On March 4, 2008, the FDA posted a release from Palo Alto Labs (dated February 28) announcing a voluntary nationwide recall of the company's supplement products sold under the name Aspire36 and Aspire Lite. Palo Alto Labs is conducting this recall after being informed by representatives of the Food and Drug Administration (FDA) that lab analysis by FDA of Aspire36 and Aspire Lite samples found that the products contained Aildenafil in trace amounts and Dimethyl sildenafil thione (sulfoaildenafil) a purported analog of Sildenafil, an FDA-approved drug used as treatment for male Erectile Dysfunction (ED). Sulfoaildenafil is close in structure to Sildenafil and is expected to possess a similar pharmacological and adverse event profile. This may pose a threat to consumers because the analogue may interact with nitrates found in some prescription drugs (such as nitroglycerin) and may lower blood pressure to dangerous levels. Consumers with diabetes, high blood pressure, high cholesterol, or heart disease often take nitrates. ED is a common problem in men with these conditions, and consumers may seek these types of products to enhance sexual performance.