Try fitting in some higher-calorie and higher-protein options like shakes or bars earlier in the day. That spreads protein intake better and makes the totals easier to reach.
I'm four weeks into 2.5 mg of the medication. Work breaks are at 11 a.m. and I head straight to the gym after my shift. By 11 p.m. I've usually only managed 700 to 1000 calories and nothing between the end of work and the gym. Then around 7 or 8 p.m. I suddenly have to pack in the rest of my protein and calories, which means more than another 1000 calories in one go.