Hello samade, no, because it is the same active ingredient and I had only been on it 4 weeks. The escitalopram is gentler and causes less stomach upsets so as I suffer with IBS my GP was happy for me to change over. I found I needed a slightly lower dose of the escitalopram. Because it has fewer additives the active ingredient can be absorbed better. I was on 10mg citalopram and only take 5mg escitalopram.
Have a chat with your GP as this is only my experience, yours could be different.