Hi Debbie
I found citalopram to be quite effective for a while, but as you've found, the effects can wear off. I found mirtazapine to be really good at making my depression go away, but it does come with a sedative effect (the opposite of citalopram) and as Steve has said, there's the possibility of weight gain. I gained a fair bit of weight on mirt. which I'm still struggling to shift. Coming from citalopram to mirtazapine, from a stimulant to a sedative might take a bit of getting used to, but persevere, it might be very effective for you. I found that the mirt. helped me sleep where I wasn't before and gave me a more positive mindset. I found that I couldn't get going though so whilst the mind was willing, the body wasn't. (I used to do triathlon, but haven't swam, run or cycled in a number of years because of depression). Hopefully, mirtazapine will work for you too. Give it a go, the side effects should dissipate over time and if your dose is increased as you come off citalopram, you should find the sedative effect is reduced too. If you're still feeling out of it after a month or so talk to your GP/psych again and see if they can offer any alternatives.