·

cure ED

·	increase a man’s sexual desire

·	protect a man or his partner from sexually transmitted diseases, including HIV. Speak to your healthcare professional about ways to guard against sexually transmitted diseases.

·	serve as a male form of birth control

·	take any medicines called “nitrates”

·	use recreational drugs called "poppers" like amyl nitrate and butyl nitrate

·	have been told by your healthcare professional not to have sexual activity because you have health problems

·	an erection that won’t go away (priapism) vision changes, such as seeing a blue tinge to objects or having difficulty telling the difference between the colors blue and green

·

Headache

·

Flushing

·	stuffy or runny nose

·	Indigestion

·	upset stomach

·

dizziness

·	have or had heart problems

·	have low blood pressure or have high blood pressure that is not controlled

·	have had a stroke

·	or any family members have a rare heart condition known as prolongation of the QT interval (long QT syndrome)

·	have liver problems

·	have kidney problems and require dialysis

·	have ever had severe vision loss

·	have retinitis pigmentosa, a rare genetic (runs in families) eye disease

·	have stomach ulcers

·	have a bleeding problem

·	have a deformed penis shape or Peyronie’s disease

·	have had an erection that lasted more than 4 hours

·	take any medicines called “alpha blockers” (alpha blockers are sometimes prescribed for prostate problems or high blood pressure)

·	have blood cell problems, such as sickle cell anemia, multiple myeloma, or leukemia