Find a comprehensive guide to possible side effects including common and rare side effects when taking Celexa (Citalopram Hydrobromide) for healthcare professionals and consumers. Find patient medical information for Celexa Oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. Antidepressant Warnings: There have been 151 warnings from 11 countries (Australia, Canada, Denmark, Germany, Ireland, Italy, Japan, New Zealand, Russia, United Kingdom and United States) and the European Union warning that antidepressants cause harmful side effects. Information about citalopram (Celexa) an antidepressant drug prescribed for depression, anxiety, OCD, panic disorder, PTSD, and premenstrual dysphoric syndrome. Citalopram (Celexa) is used for treating depression, obsessive-compulsive disorder (OCD), panic disorder and some eating disorders. The molecular formula is C 20 H 22 BrFN 2 O and its molecular weight is 405.35. Citalopram HBr occurs as a fine, white to off-white powder. Citalopram HBr is sparingly soluble in water and soluble in ethanol. Taking citalopram with other drugs that make you sleepy or slow your breathing can cause dangerous side effects or death. Ask your doctor before taking a sleeping pill, narcotic pain medicine, prescription cough medicine, a muscle relaxer, or medicine for anxiety, depression, or seizures. According to the product label, patients treated with Celexa in controlled clinical trials had a weight loss of 0.5kg, or 1.1 lbs., compared to no weight changes in the placebo group. Note: This document contains side effect information about citalopram. Some of the dosage forms listed on this page may not apply to the brand name Celexa. Celexa (citalopram) is an antidepressant in a group of drugs called selective serotonin reuptake inhibitors (SSRIs). Includes Celexa side effects, interactions and indications.