Campaigners against the HPV vaccine have staged a protest outside the gates of Leinster House.
More than 100 people gathered on Kildare Street over what they claim is the inadequate medical treatment provided to those they believe have suffered an adverse reaction to the vaccine.
The REGRET support group says some teenage girls endure ongoing fatigue, seizures and autoimmune conditions after getting the vaccine.
They want the Department of Health to establish an independent investigation into the vaccine.
Two ambulances were called to Leinster House during today's demonstration.
Paramedics first treated two teenagers at the scene and they were later brought to hospital.
The protesters claimed both teenagers had suffered seizures as a result of the vaccine.
Last year, Minister for Health Simon Harris backed a new campaign to encourage parents to avail of the HPV vaccine.
Mr Harris said the vaccine saves lives and the information campaign provides medical facts and helps inform parents.
In a statement the Department of Health said the HPV vaccine protects girls from developing cervical cancer when they grow up.
"The HSE estimates that in 2018 more than 90 Irish women will die from cervical cancer; a further 280 will need intensive treatment, such as surgery, radiotherapy or chemotherapy; and that four in ten of these women will die within 5 years. The HPV vaccine saves lives."
It added: "The HPV vaccine is one of the most closely studied and monitored medicinal products.
"There is no scientific evidence that the vaccine causes long term illnesses."