<prompt> Translate the following text to EnglishHii ni kwa sababu dawa maarufu za kuongeza serotonini, kama vile Redux na Fen-Phen, zinaweza kuharibu moyo na kuharibu mishipa ya moyo.  <response>: Time s cover story explains how popular serotonin-boosting drugs such as diet pills Redux and fen-phen work, and how they can be health risks high serotonin levels damage heart valves. 