The word "Viagra" is familiar to many, referring to the blue pill that can revitalize male vigor. Even if you haven't used it, you've probably heard of it.
Initially, Viagra was developed for the treatment of pulmonary arterial hypertension. Later, it was discovered by chance to have a significant effect on erectile dysfunction (ED). Thus, the world's first drug for treating ED was born.
Today, many men who have tried Viagra can't help but worry: will long-term use lead to addiction? Are there side effects? Will it affect fertility?
