The vaccine can be safely administered at the same time as other vaccines are given, like the Tdap, meningococcal or influenza vaccine. Although HPV vaccine should not be given during pregnancy, no fetal harm has yet been shown when pregnancy was discovered after one or more doses of the vaccine were administered.
Thus far, there is also no indication that vaccine protection diminishes with time. Individuals followed for up to 10 years post-immunization have shown no sign of decreased protection, and booster doses are not required.