Phenterimine diet pills while breastfeeding.. is it safe?

I only breastfeed once a day at night for my daughter to go to sleep. She is almost one years old. I want to start this diet pill to help me lose weight as I havent lost any weight and gained 50 pounds I’ve never been this big in my life and it’s affecting me mentally I’m trying to wean my daughter but she’s growing thru a hard time with teething and growing so I feel bad taking her night feeding. Is it safe to take this pill? I’d be taking it every morning.