I have a question about obesity injections!

Hello, I've recently been looking into weight loss injections for the first time. I'm curious if the onset time and duration of effects vary depending on the specific injection. I'm asking about all injections in general. I want to know how long the weight management effects last after stopping the injections following a certain period. If I eat the same amount of food and exercise as I did while receiving the injections, will the weight loss continue or be maintained? I'm also wondering if there is a duration for which the effects persist after stopping, or if my weight might return relatively quickly after discontinuing the medication. Honestly, this is my biggest concern. It seems highly likely that my appetite will explode, but I'm wondering if I won't gain more weight if I control my cravings and exercise hard.