"lost 20 lbs in three months side effects were tingling feet, insomnia , irritability and metallic taste of soda.  side effects were worth the weight loss that i was unable to lose otherwise . i am mid sixties and thirty lbs overweight . my doctor gave me another three month prescription and i hope to reach my goal. i have more energy and am exercising for the first time in 15 years. it is expensive, but worth it."