The FDA ( Food and Drug Administration ) has approved use of the vaccine Gardasil for the prevention of genital warts ( condyloma acuminata ) due to human papillomavirus ( HPV ) types 6 and 11 in boys and men, ages 9 through 26.

Each year, about 2 out of every 1,000 men in the United States are newly diagnosed with genital warts.

Gardasil currently is approved for use in girls and women ages 9 through 26 for the prevention of cervical, vulvar and vaginal cancer caused by HPV types 16 and 18; precancerous lesions caused by types 6, 11, 16, and 18; and genital warts caused by types 6 and 11.

HPV is the most common sexually transmitted infection in the United States and most genital warts are caused by HPV infection.

Gardasil’s effectiveness was studied in a randomized trial of 4,055 males ages 16 through 26 years old. The results showed that in men who were not infected by HPV types 6 and 11 at the start of the study, Gardasil was nearly 90 percent effective in preventing genital warts caused by infection with HPV types 6 and 11.

Studies were conducted to measure the immune response to the vaccine in boys ages 9 through 15. The results showed that the immune response was as good as that found in the 16 through 26 years age group, indicating that the vaccine should have similar effectiveness.

The manufacturer, Merck & Co, will conduct postmarketing studies to obtain additional information on the safety and effectiveness of Gardasil in boys and men.

Gardasil is given as three injections over a 6-month period. Headache, fever and pain at the injection site, itching, redness, swelling and bruising, were the most common side effects observed.

Source: FDA, 2009

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