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.
In summary, the drugs that can cause serotonin side effects are those that: 1  Promote the release of 5 HT from nerve endings. 2  Prolong the action of 5 HT at nerve endings by blocking the reuptake of the neurotransmitter. 3  Mimic 5 HT by binding to serotonin receptors and eliciting similar pharmacological responses.