Therefore, if you're planning a long journey, you should always apply for the Russian visa before you leave. It's possible to get a tourist visa support at any moment before your journey, however, you can only apply for a tourist visa not earlier than 90 days before the date of your first entry to Russia.
Serotonin is a common neuromediator in the brain. It belongs to the group of so-called biogenic amines, relatively simple chemicals that facilitate the transfer of signals between the cells of the body.
1 Serotonin is a brain chemical that helps regulate mood and behavior, and increasing serotonin is one way of treating depression. 2  But if you're taking depression medication that increases serotonin too much, you could be at risk for a dangerous drug reaction called serotonin syndrome. Serotonin is a brain chemical that helps regulate mood and behavior, and increasing serotonin is one way of treating depression. 2  But if you're taking depression medication that increases serotonin too much, you could be at risk for a dangerous drug reaction called serotonin syndrome.