We have noticed quite a few posts querying the use of anti-histamines when talking Pitolisant/Wakix.
We have referred this to the manufacturer who have referred to the wording contained in the Summary of Product Characteristics (See e.g. here: https://www.medicines.org.uk/emc/glossary ) which you will find online or in each box of medicine within the Patient Information Leaflet.
Re. Anti-histamines, the exact wording from SPC: