Are diet pills effective?

I used to completely believe in traditional medicine, but after trying herbal medicine two years ago to boost my immunity and having a frightening experience, I can't trust it anymore.

I vomited, my whole body was weak, and I almost died.

After taking the pulse, I tailored the treatment to my constitution, but since there were side effects, I even developed distrust towards the herbal medicine.ㅜ

But I'm interested in diet pills haha

It's so hot in summer that even just walking makes you sweat, but the weight loss is slow, so I need a helping hand! Please advise those who have lost weight with diet pills~~