1 In a dry sink, pour at least 1 cup of baking soda down the blocked drain, and ensure that the powder makes its way down the drain. 2  Next, pour approximately 2 cups of boiling water in and wait several minutes.3  Add one more cup of baking soda in and immediately follow it with one cup of plain white vinegar. In a dry sink, pour at least 1 cup of baking soda down the blocked drain, and ensure that the powder makes its way down the drain. 2  Next, pour approximately 2 cups of boiling water in and wait several minutes.
Tricyclic antidepressants (TCAs) are a class of antidepressant medications that share a similar chemical structure and biological effects. Scientists believe that patients with depression may have an imbalance in neurotransmitters, chemicals that nerves make and use to communicate with other nerves.
Tricyclic antidepressant. Chemical structure of the prototypical and first marketed tricyclic antidepressant imipramine. Notice its three rings. Tricyclic antidepressants (TCAs) are chemical compounds used primarily as antidepressants. TCAs were first discovered in the early 1950s and marketed later in the decade. They are named after their chemical structure, which contains three rings of atoms.