[July 2024] I have more information on the Intelgenx Medical Technologies montelukast Alzheimer's trial in Canada. A preliminary report shows participants who took the highest dosage of 30 mg twice a day of their version of montelukast showed significant cognitive improvement. The final report of results will be completed this quarter (July, August, or September).
Another much larger trial will need to be conducted to determine  effectiveness and dosage. That means that it will take at least another two years for approval. Intelgenx also has to come up with more money to pay for a larger trial.

https://alzheimersnewstoday.com/news/montelukast-oral-film-aids-cognition-mild-moderate-alzheimers/