Some of the most common side effects of using Caverject include bleeding at the site of drug injection, fever, urethral pain, apnea and painful erection, according to Drugs.com. Some of the more rare symptoms are bruising or blood clot formation at the injection site. Up to 36 percent of users experience penile pain with Caverject, up to 13 percent experience urethral pain, and up to 15 percent of users experience bleeding at the injection site.
Caverject is an injectable drug that is used for the treatment of male erectile dysfunction. It increases blood flow to the penis by widening blood vessels and relaxing some of the muscles of the penis, thus facilitating the formation of an erection. If any of the more rare side effects occur after use of Caverject, such as an erection lasting between four and six hours, an erection lasting longer than six hours that is accompanied by pain, or pain and swelling in the testes, contact a health care professional immediately, according to Drugs.com. People who have blood or bone marrow complications and those who have penile implants should not use Caverject. Additionally, people who have been advised to avoid sexual intercourse should not take Caverject.