Gardasil 9 is a vaccine that prevents human papillomavirus (HPV) infection, helping to protect against conditions such as cervical cancer, anal cancer and genital warts. This article sets out the eligible ages, the number of doses and how to manage the schedule. In short, the ideal time is age 11 to 12, before any sexual experience, but even for those slightly past that age range or who are already sexually active, the vaccine still protects against other HPV types, so starting now is the better choice.
Who can receive Gardasil 9, and up to what age?
Human papillomavirus (HPV) is transmitted regardless of sex and can cause genital warts or anal cancer in men, so Gardasil 9 is recommended for men as well as women. Gardasil 9 protects against both the low-risk types that cause warts and the high-risk types linked to cancer, covering the widest range of types among the HPV vaccines currently available.
The ideal age for Gardasil 9 is considered to be 11 to 12, before sexual activity begins, because building immunity before any exposure to the virus is the most reliable form of prevention. Even for those slightly past that age range or already sexually active, the vaccine still offers meaningful protection against HPV types they have not yet been infected with, so it is worth starting.
- Women aged 9 to 45 — to help prevent cervical, vulvar and vaginal cancer
- Men aged 9 to 26 — to help prevent anal cancer and genital warts
- Age 11 to 12 — regarded as the ideal age because it comes before sexual experience
How does the number of Gardasil 9 doses change with age?
When planning the timing of Gardasil 9, the first thing to check is age, because the total number of doses changes at 14. Younger people mount a more active immune response and gain protection from fewer doses, so families with children benefit from not missing the 2-dose window between age 9 and under 14.
If there is a fever on the day of a Gardasil 9 dose, the timing should be discussed again with the medical team, and after vaccination it is advisable to avoid strenuous exercise, alcohol, and bathing or showering. Local pain at the injection site or a mild fever is regarded as a normal immune response while the vaccine builds immunity, so there is no need for great concern.
- Age 9 to under 14 — 2 doses in total, given at 0 months and 6 to 12 months
- Adults aged 15 and over — 3 doses in total, given at 0, 2 and 6 months
- Completion deadline — regardless of age, all doses are completed within 1 year
If dose 2 or dose 3 is delayed, do I have to start over?
Keeping to the set schedule matters above all with vaccines, because missing the timing of dose 2 or dose 3 of Gardasil 9 can mean immunity does not develop properly. For adults, the 3-dose schedule is dated from the day of dose 1, so marking the dates 2 months and 6 months later on a calendar on the day of dose 1 makes it less likely that a dose will be missed.
If a Gardasil 9 dose is delayed by a few days for unavoidable reasons, the doses already given do not become invalid, and the remaining doses can simply be continued. If a long time passes, however, it may be necessary to start again from dose 1, so once the schedule has slipped, completing the remaining doses promptly is what allows the full preventive effect.
- Dose 1 (0 months) — the start date, which sets the dates of all later doses
- Dose 2 (2 months later) — given at least 2 months after dose 1
- Dose 3 (6 months later) — given 6 months after the date of dose 1 to complete the series