Hi Prider
I can understand why you might want to take Mirtazapine as a last resort for weight gain, but please do read that leaflet and know that you are taking a strong drug that is mind altering, at any strength, 15, 30 or 45 mg. One person on this forum only took 7.5 mg for 12 weeks and had terrible withdrawal.
Also be aware that most doctors recommend starting at 15 mg not 30 mg, and if necessary work up to 30 mg after several weeks, which gives your mind and body time to adjust. Very many people have had bad episodes when going up to 30mg with anxiety and nausea. Yes the slow release sedation is stronger on the lower dose, but it does ease off once your body has got used to it.
Mirt will only increase your appetite whilst you are on it, and thinking logically, if you only want to stay on it for 6 weeks, that increase will stop after that time, again "obviously". Is it worth risking your mental health for. At least you will have lots of info' and advice from this forum to help you make up your mind.
As a rule of thumb, to withdraw the best advice is to reduce Mirt by 10% every 3 to 4 weeks, which will go some way to reduce WD effects. Being on for only 6 weeks you may get away with quicker, but : "You won't know if you're in the unlucky minority until it's too late. (It can take 2 weeks to feel any effects of wd then BAM - it hits you). It's a lot easier to taper slowly than to put your nervous system back together again after it's injured. It's a Humpty-Dumpty situation. Once your nervous system falls off that wall, there's not much that can be done to put it together again.
So, harsh as it sounds, I'd steer well clear of Mirt if I were you, you sound like you have a healthy mind, sleeping well, no anxiety, blessed, unlike most people on this forum, including me, who have to take it.
Anyway, let us know what you decide, and if it works for you - I hope you have an easy ride Prider I really do, but be caustious with this little "megga" drug.
C