Taken Citalopram for 2 weeks now (20mg.) Feeling good. Read about anaphylactic reaction side effect? So scared to take them now. How common is this?

Anaphylaxia. In my experience, I have never encountered an anaphylactic reaction to Citalopram. Also, usually such a reaction, to any agent or medication, entails previous sensitization to it, and usually occurs after the first contact with the allergen. You have been taking it for two weeks,