Sildenafil is an US Food and Drug Administration (FDA) approved drug used in the treatment of male Erectile Dysfunction (ED).
The FDA said that the undeclared ingredient may pose a threat to the consumer because the interaction of the analogue with some prescription drugs (such as nitroglycerin) may lower blood pressure to dangerous levels.
Drive Total Energy stated that so far, the company is not aware of any reports made to the FDA concerning any adverse effects associated with the use of Rock Hard Extreme or Passion Coffee.