Use of products with the undeclared active ingredients, sildenafil and tadalafil, may pose a threat to consumers because the active ingredient may interact with nitrates found in some prescription drugs (such as nitroglycerin) and may cause a significant drop in blood pressure that may be life threatening. Among the adult male population who are most likely to use these products, adult males who use nitrates for cardiac conditions are the most at risk from these products. These products are considered tainted. To date, Shoreside Enterprises, Inc. has not received any reports of adverse events related to this recall.

https://www.fda.gov/Safety/MedWatch/SafetyInformation/SafetyAlertsforHumanMedicalProducts/ucm608142.htm