Buzzed by "diet pills"

Yes, you are correct. The pills that your friend is taking could cause damage to her. Certainly,finding them over the internet is not a wise way to purchase medications. How would one verify if the seller is reputable? There is no "quick fix" for weight reduction. If that were the case, someone would be a millionaire. The only quotient is reduction in the caloric intake and increase in calorie burning activity. You are a good friend to be concerned with her wellbeing. You must think about this: Would you be okay should something happen to your friend as a result of these pills? If you think that you would have regret, then I believe contacting her parents would be the thing to do. If you friend is truly that, she eventually would know that you had her best interest at heart. Once you inform her parents, then you must be able to "let it go" recognizing that you have no further control. Have strength and go with your instincts. Good luck.