From deli meat to frozen waffles , listeria recalls keep popping up — but why? Here's what to know, including symptoms to be aware of.

Viagra is a prescription drug used to treat erectile dysfunction. Learn about the common, mild, and serious side effects it can cause and how to manage them.

Clindamycin is a generic prescription drug used for certain infections in adults and children. Learn about mild and serious side effects and how to manage them.