It took me 8 months to come off Citalopram (only 20mg too!) after a decade.
Tried a few times doing it too quickly and had awful side effects, doing it very very slowly was the way to go.
I went to 15mg for ages, waited til that felt okay, then 10 for 3 months, then 5 for a month or so, then 5 broken in half to 2.5 every day, then 2.5 every other day. It was still horrible when I stopped completely, but much less so/for less long than it had been before when I'd tried.
Weirdly, despite my mental health generally being in a better place than it's been in a long time, I now cry very, very very easily since coming off them. I probably cry 5-6 times a day - almost like a reflexive action to any emotional stimulus at all, nice or not. Something like someone making me a cup of tea sets it off - it's like my emotional response is wonky. GP thinks it's related to coming off them but has no ideas for fixing it, which is incredibly frustrating.
BUT yes - it's possible, just do it slowly and carefully.