Celexa^TM (citalopram HBr) is an orally administered selective serotonin reuptake inhibitor (SSRI) with a chemical structure unrelated to that of other SSRI's or of tricyclic, tetracyclic, or other available antidepressant agents.

The molecular formula is C₂₀H₂₂BrFN₂O 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.

Celexa^TM is a film coated oval scored tablet containing citalopram HBr in strengths equivalent to 20 mg or 40 mg citalopram base

Inactive Ingredients Copolyvidone Corn Starch Crosscarmellose Sodium Glycerin Lactose Monohydrate Magnesium Stearate Hydroxypropyl Methyl Cellulose Microcrystalline Cellulose Polyethylene Glycol Titanium Dioxide and Iron Oxides are used as coloring agents in the pink 20 mg tablets.