While we do not know for sure, we speculate that Viagra's recent use as a 'drug of abuse' may have caused the FDA to request broader studies in (non-erectile dysfunction) patients,  -   Todd Nelson     Quotes
While we do not know for sure, we speculate that Viagra's recent use as a 'drug of abuse' may have caused the FDA to request broader studies in (non-erectile dysfunction) patients, Todd Nelson
 FDA