As far as I know Citalopram is a selective serotonin reuptake inhibitor (SSRI) not a barbiturate.
Barbiturates = Allobarbital (Asmac, Cibalgine, Dial, Somnocodal); Amobarbital/Amylobarbitone (Anytal); Aprobarbital (Aluratec, Amobarbital, Amylbarbitone, Amytal, Aprobarbital, Brevital, Busodium, Butabarbital, Butisol, Mebaral, Mephobarbital, Metharbital, Methohexital, Nembutal,Pentobarbital, Pentothal, Pentothal, Phenobarbitone, Quinalbarbitone, Secobarbital, Seconal, Sodium Pentothal, Talbutal, Thiamylal, Thiopental); Barbexaclone (Maliasin); Barbital/Barbitone (Barbital, Calmine, Neurinase, Peralga, Plexonal, Veramon, Veronal); Butabarbital (Butisol); Butalbital; Butobarbital (Soneryl); Cyclobarbital/Cyclobarbitol/Cyclobarbitone; Ethallobarbital; Heptabarbital; Hexobarbital; Metharbital (Gemonil); Methohexital (Brevital); Methylphenobarbital/Mephobarbital (Mebaral, Prominal); Pentobarbital (Nembutal); Phenobarbital/Phenobarbitone (Luminal); Proxibarbal; Reposal; Secobarbital (Seconal, Tuinal); [Sodium] Thiopental (Sodium Pentothal); Talbutal (Lotusate); Thiobarbital; Vinbarbital (Sonuctane); Vinylbital/Butylvinyl
(list list is to the best of my google scholar abilities)
