The risk or severity of adverse effects can be increased when Deramciclane is combined with Cetirizine. Cetirizine may increase the central nervous system depressant (CNS depressant) activities of Thalidomide. The risk or severity of adverse effects can be increased when Cetirizine is combined with Promethazine. The risk or severity of adverse effects can be increased when Heroin is combined with Cetirizine. The risk or severity of adverse effects can be increased when Alprazolam is combined with Cetirizine. Chlorphentermine may decrease the sedative activities of Cetirizine. The risk or severity of adverse effects can be increased when Dapiprazole is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Guanfacine. The risk or severity of adverse effects can be increased when Cinchocaine is combined with Cetirizine. Nabilone may increase the central nervous system depressant (CNS depressant) activities of Cetirizine. The risk or severity of adverse effects can be increased when Ropivacaine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Nitrous oxide is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Chlorphenamine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Etoperidone. The risk or severity of adverse effects can be increased when Ondansetron is combined with Cetirizine. The risk or severity of adverse effects can be increased when Phenobarbital is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Desvenlafaxine. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Cetirizine. The risk or severity of adverse effects can be increased when Perazine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Canertinib is combined with Cetirizine. The risk or severity of adverse effects can be increased when Reserpine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Gabapentin Enacarbil. The risk or severity of adverse effects can be increased when Amperozide is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Scopolamine. Magnesium Sulfate may increase the central nervous system depressant (CNS depressant) activities of Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Fluticasone propionate. The risk or severity of adverse effects can be increased when Adipiplon is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Olopatadine. The risk or severity of adverse effects can be increased when Allopregnanolone is combined with Cetirizine. The risk or severity of adverse effects can be increased when Dihydrocodeine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Phenoxyethanol is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Levocabastine. The risk or severity of adverse effects can be increased when Propoxycaine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Promazine is combined with Cetirizine. Hydroxyzine may increase the central nervous system depressant (CNS depressant) activities of Cetirizine. Cetirizine may increase the central nervous system depressant (CNS depressant) activities of Buprenorphine. The risk or severity of adverse effects can be increased when Opium is combined with Cetirizine. The risk or severity of adverse effects can be increased when Methapyrilene is combined with Cetirizine. The risk or severity of adverse effects can be increased when Tetracaine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Flurazepam is combined with Cetirizine. Minocycline may increase the central nervous system depressant (CNS depressant) activities of Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Sertraline. The risk or severity of adverse effects can be increased when Cetirizine is combined with Clobazam. The risk or severity of adverse effects can be increased when Cetirizine is combined with Venlafaxine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Efavirenz. The risk or severity of adverse effects can be increased when Sepranolone is combined with Cetirizine. The risk or severity of adverse effects can be increased when Fluphenazine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Flunarizine. The risk or severity of adverse effects can be increased when Perospirone is combined with Cetirizine. Cetirizine may increase the sedative activities of Ropinirole. The risk or severity of adverse effects can be increased when Hydromorphone is combined with Cetirizine. The risk or severity of adverse effects can be increased when Flupentixol is combined with Cetirizine. The risk or severity of adverse effects can be increased when Zotepine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Iloperidone. The risk or severity of adverse effects can be increased when Cetirizine is combined with Fluoxetine. Cetirizine may increase the sedative activities of Metyrosine. The risk or severity of adverse effects can be increased when Methadone is combined with Cetirizine. The risk or severity of adverse effects can be increased when Haloperidol is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Tizanidine. The risk or severity of adverse effects can be increased when Triazolam is combined with Cetirizine. The risk or severity of adverse effects can be increased when Pimozide is combined with Cetirizine. The risk or severity of adverse effects can be increased when Nalbuphine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Oxethazaine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Topiramate is combined with Cetirizine. The risk or severity of adverse effects can be increased when Phenytoin is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Lamotrigine. The risk or severity of adverse effects can be increased when Benzyl alcohol is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Dimenhydrinate. The risk or severity of adverse effects can be increased when Bromazepam is combined with Cetirizine. Lisdexamfetamine may decrease the sedative activities of Cetirizine. The risk or severity of adverse effects can be increased when Tolcapone is combined with Cetirizine. The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Etomidate is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Ethosuximide. Pseudoephedrine may decrease the sedative activities of Cetirizine. Midomafetamine may decrease the sedative activities of Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Brompheniramine. The risk or severity of adverse effects can be increased when Dihydromorphine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Levomilnacipran. Hydroxyamphetamine may decrease the sedative activities of Cetirizine. The risk or severity of adverse effects can be increased when Perphenazine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Clorazepate is combined with Cetirizine. The risk or severity of adverse effects can be increased when Zopiclone is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Citalopram. The risk or severity of adverse effects can be increased when Benzocaine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Triprolidine. The risk or severity of adverse effects can be increased when Ziprasidone is combined with Cetirizine. Methamphetamine may decrease the sedative activities of Cetirizine. The risk or severity of adverse effects can be increased when Asenapine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Flibanserin. The risk or severity of adverse effects can be increased when Drotebanol is combined with Cetirizine. The risk or severity of adverse effects can be increased when Pentobarbital is combined with Cetirizine. The risk or severity of adverse effects can be increased when Ecopipam is combined with Cetirizine. The risk or severity of adverse effects can be increased when Quetiapine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Gamma Hydroxybutyric Acid is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Amoxapine. Dronabinol may increase the central nervous system depressant (CNS depressant) activities of Cetirizine. Sodium oxybate may increase the central nervous system depressant (CNS depressant) activities of Cetirizine. The risk or severity of adverse effects can be increased when Diazepam is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Desipramine. The risk or severity of adverse effects can be increased when Temazepam is combined with Cetirizine. The risk or severity of adverse effects can be increased when Agomelatine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Butethal is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Brexpiprazole. The risk or severity of adverse effects can be increased when Thioridazine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Remifentanil is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Dantrolene. The risk or severity of adverse effects can be increased when Cetirizine is combined with Primidone. The risk or severity of adverse effects can be increased when Levorphanol is combined with Cetirizine. The risk or severity of adverse effects can be increased when Etifoxine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Zimelidine. The risk or severity of adverse effects can be increased when Oxybuprocaine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Olanzapine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Pramocaine is combined with Cetirizine. Cetirizine may increase the sedative activities of Rotigotine. The risk or severity of adverse effects can be increased when Rufinamide is combined with Cetirizine. The risk or severity of adverse effects can be increased when Diphenoxylate is combined with Cetirizine. 2,5-Dimethoxy-4-ethylamphetamine may decrease the sedative activities of Cetirizine. The risk or severity of adverse effects can be increased when Levomethadyl Acetate is combined with Cetirizine. The risk or severity of adverse effects can be increased when Piritramide is combined with Cetirizine. The risk or severity of adverse effects can be increased when Chlormezanone is combined with Cetirizine. The risk or severity of adverse effects can be increased when Thiamylal is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Pipotiazine. The risk or severity of adverse effects can be increased when Alfentanil is combined with Cetirizine. The risk or severity of adverse effects can be increased when Molindone is combined with Cetirizine. The risk or severity of adverse effects can be increased when Tramadol is combined with Cetirizine. The risk or severity of adverse effects can be increased when Ethyl loflazepate is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Tasimelteon. Diethylpropion may decrease the sedative activities of Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Fosphenytoin.