Phenphedrine? okay for people under 18?

Okay so the dietary pill phenphedrine looks like it has really good results. I am over weight and would really like some help. i am 14 years old and i know that you shouldnt really take diet pills when your a kid but i just finished a bottle of dexatrim max 7 compleate and i felt no harm. i think it worked a little but i still want something better. so would i be in danger or be risking death if i took it under the age of 18? i am 167 lbs and 5'4". 14 years old. Please put your answer as nice as possible because its a hard thing for me to talk about. Thanks :)