If you’re just starting out with weight loss, part of that 9 lb drop is probably water. Sustaining 4.5 lb a week isn’t realistic and would require a daily deficit over 2,000 calories.
I’m taking 2 mg weekly and dropped 9 lbs over the past two weeks, which feels huge since I started at 238 and now sit at 229. Haven’t seen the 220s in years. No real side effects, so I wondered if it was even working, but I notice only mild appetite changes mainly around sweets. I can still eat a big meal like ribs if I want, and even after two days of extra eating during playoffs the weight kept coming off. At this point I’m fine with the current level of control as long as it keeps me away from desserts and snacks. Protein intake hasn’t been an issue either.