Island vacation spots on normal color vision: the capacity to distinguish the three primary color systems of light-dark, red-green, and blue-yellow, attributable to the presence of all three types of photopigment. See also achromatism; dichromatism; monochromatism. tricyclic antidepressant (TCA) any of a group of drugs, developed in the 1950s, that were the original first-line medications for depression and represented the mainstay of antidepressant treatment until fluoxetine (Prozac) the first ssri was introduced in 1987. They are presumed to act by blocking the reuptake of monoamine neurotransmitters (serotonin, dopamine, and norepinephrine), thereby increasing the amount of neurotransmitter available. Side effects of TCAs include significant anticholinergic effects (e.g., dry mouth, blurred vision, constipation, urinary retention), drowsiness or insomnia, confusion, anxiety, nausea, weight gain, and impotence. Island vacation spots 2016.
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