"i have been on belviq for one week and have lost 4 lbs. i had a mild headache the very first day and felt a little lightheaded for 3 days, but nothing severe or that i couldn&#039;t handle. i just decided not to drive, but now at 1 week i have no negative symptoms. it&#039;s definitely working, as i don&#039;t have hunger pains and have to look at the clock to make sure i do eat something. my doctor also gave me a menu to follow and i just use it as a guideline. i don&#039;t feel like i miss out on anything! i will send an update."