I had a similar drug, and felt hungry all day. It was difficult to lose weight and stick to three meals a day. I've been off those tablets for 8 days now, and my appetite has regulated itself quite nicely.
Whe I was having the super hungry fits before, I was making a pudding from coconut flour or ground almonds with an egg, some cocoa powder and a spoon of artificial sweetener mixed up and microwaved for one minute. I served it up with double cream and can honestly say I was full to the brim, and it saw to that sweet tooth (which I never had before - always been a cheese and savoury girl).
My nurse last week agreed to a trial of no medication, and said these type of drugs often make you hungry and it is very common to gain weight with them.
Oh, and add some butter to that cake mix if you fancy trying it
Good luck and keep experimenting!