Det firma, der fremstiller Prialt, er i færd med at gennemføre en undersøgelse vedrørende langtidsanvendelse af lægemidlet, specielt muligheden for at udvikle tolerance over for behandlingen (dvs. at virkningen af en bestemt lægemiddeldosis efterhånden aftager).
The company that makes Prialt is carrying out a study looking at the long term use of the medicine, looking in particular at the possibility of development of tolerance to treatment (when doses of a medicine that were effective become less effective over time).