The team of doctors who have examined Navalny since his arrival on Saturday had found the presence of " cholinesterase inhibitors" in his system, the statement said.
Now, since Alzheimer's has been linked to a deficiency of acetylcholine in the brain, cholinesterase inhibitors were introduced to alleviate the symptoms of the disease.
As their name suggests, cholinesterase inhibitors work simply by inhibiting cholinesterase enzymes from breaking down acetylcholine, thereby increasing both the level and duration of action of acetylcholine.