I am an old woman, aged 68. Suffering from ocd. In 2001, I was advised to take citalopram and was fully cured and rid of all symptoms. But again in 2009, I had a relapse. under the advice of my psychiatrist , I am presently having fluvaxamine 100 mg twice daily plus citalopram 10 mg twice daily.  Is of no sustained benefit. Can I switch over to some other drug?
His understand your concern. OCD has episode of relapse and need to treat as such. Fluoxamine and citalopram both are SSRI and has good review in treatment of OCD. Clomipramine is also useful Chat Doctor.  . But change in medicines or change in doses only require if you do not have benefit from old regimen. There are lots of augmentation strategy for OCD for that you have to take medicines Regularly and do take follow up regularly. Take your doctors advise who knows your detail history. I hope I have answered your question. Still if you have a query then feel free to ask. Thank you. Take care.