About a dozen former members of the Defence Forces have demonstrated in Dublin over claims that medication they were given on overseas peacekeeping duties has caused them long-term health problems.
Soldiers were prescribed the anti-malaria drug, Lariam, when they served in Eritrea, Liberia and Chad.
However some veterans have formed a group, Action Lariam for Irish Soldiers, because they say their health has been damaged from the side effects of the drug.
These include tiredness, depression and suicide. They say safer anti-malaria drugs could have been prescribed.
The group says it has about 100 members and that it supports both serving and retired personnel.
The Department of Defence has confirmed that four legal actions against the State have been initiated.
This morning's protest took place outside a Dublin hotel where a conference on travel medicine is taking place.