Letters to the Editor: Increased platelet serotonin levels in hypertensive patients already taking antihypertensive drugs

Serotonin (5’-hydroxy tryptamine; 5-HT) is a bioamine, which is synthesized from L-tryptophan mainly in enterochromaffin cells of the gastrointestinal tract and central nervous system. It has been implicated in various disorders including pulmonary hypertension and essential hypertension (1). However, there is paucity of data about the effect of antihypertensive therapy on platelet serotonin levels.