Speak to your doctor if you feel light-headed or have chest pain during sex. You should also see your doctor if you feel nauseous, dizzy, or like you are going to pass out. These are all possible symptoms of a heart mesele caused by Cialis.[8] X Research sourceUnder the Crime Victims' Rights Act (CVRA), 46 codified at 18 U.S.C. § 3771, federal law