A pill form of allergy shots called Grazax is showing promise as a long lasting treatment for grass pollen allergies.
Allergy shots help prevent symptoms by exposing people to small amounts of the substance they are allergic to. Grazax pills are designed to do the same thing.
The pills are taken each day several months before the start of allergy season and then the treatment continues for three years.
A report in the Journal of Allergy and Clinical Immunology finds people had significantly fewer symptoms a year after they stopped the medication.
The pills are not yet available in the US, but a trial aimed at winning approval is currently under way.