Is Viagra Vulnerable? October 21, 2003 No Comments yet Posted in: General Biotechnology Is Viagra Vulnerable? Eli Lilly’s Cialis lasts for 36 hours–and a $100 million ad blitz will spread the word Share this:LinkedInTwitterFacebookEmail Related Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Name * Email * Website Notify me of follow-up comments by email. Notify me of new posts by email.