"warning...... never stop this medication cold turkey.  the side effects are extreme! i was in belviq for 4 months and began having side effects of nausea, headaches, and overall just a weird feeling. i stopped the medication to see if that&#039;s what the cause was. a few days later, i had severe muscle tremors and spasms, loss of coordination, sweating, shivering, shaking, headaches, and a rapid heart rate. i thought i was having a stroke. went to the er. my blood pressure was 210/150! unfortunately, every time i would have a withdrawal from this medication i would experience these symptoms. it took 2 1/2 weeks to get this medication out of my body. i was confused a lot and had severe depression. i had all of the signs of serotonin syndrome."