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.
Serotonin is a neurotransmitter that regulates many functions, including mood, appetite, and sensory perception. Serotonin syndrome typically occurs when youâve taken one or more medications that have an effect on your serotonin levels. The drugs cause too much serotonin to be released or to remain in the brain area. Symptoms of serotonin syndrome include one or more of the following: Restlessness. Hallucinations.