I've been on citralopram for several years, maybe as much as 10 years. I only take 20mg daily, but that is because I am very small. Several times the Docs tried increasing the dose, but I just got massive sweating and palpitations, so we reduced it again. They say approximately 20mg per 50kg body weight is right. An increased dose does not necessarily help your depression more, unfortunately, however it is one of the most effective anti-depressants for me.
Different anti-depressants suit different people, it can take a while to find the right one, but you need to wait at least 6 weeks to judge the effects, maybe even 12 weeks.
Good luck !!!!