Possible to lose 30 lbs in two months with Phentermine and exercise?

Don’t really want to mention how much I weigh. I’ve taken Phentermine before and it helped dramatically decrease my appetite and lost 20lbs in less than 2 months. I’m wondering, however, if I workout doing cardio (stationary bike) for 45 minutes 5 days a week and take Phentermine if I can lose this much weight in two months. I know everyone’s body differs and reacts differently to drugs, exercise, and diet, but generally speaking, what do you think?