The risk or severity of adverse effects can be increased when Deramciclane is combined with Cetirizine. Tapentadol may increase the central nervous system depressant (CNS depressant) activities of Cetirizine. The risk or severity of adverse effects can be increased when Zaleplon is combined with Cetirizine. The risk or severity of adverse effects can be increased when Trazodone is combined with Cetirizine. Cetirizine may increase the sedative activities of Metyrosine. 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 Enflurane is combined with Cetirizine. The risk or severity of adverse effects can be increased when Carfentanil is combined with Cetirizine. The risk or severity of adverse effects can be increased when Methadyl Acetate is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Nefazodone. Hydroxyzine may increase the central nervous system depressant (CNS depressant) activities of Cetirizine. Benzphetamine may decrease the sedative activities of Cetirizine. The risk or severity of adverse effects can be increased when Bromazepam is combined with Cetirizine. The risk or severity of adverse effects can be increased when Oxprenolol is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Loratadine. The risk or severity of adverse effects can be increased when Methylecgonine is combined with Cetirizine. Ritobegron may decrease the sedative activities of Cetirizine. The risk or severity of adverse effects can be increased when Cinchocaine is combined with Cetirizine. 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 Midazolam is combined with Cetirizine. 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 Morphine is combined with Cetirizine. 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 Haloperidol is combined with Cetirizine. The risk or severity of adverse effects can be increased when Topiramate is combined with Cetirizine. Diethylpropion may decrease the sedative activities of Cetirizine. The risk or severity of adverse effects can be increased when Ecgonine 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 Propoxycaine 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 Opium 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 Fluvoxamine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Chlorzoxazone. The risk or severity of adverse effects can be increased when Prazepam is combined with Cetirizine. The risk or severity of adverse effects can be increased when Alphaprodine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Escitalopram. The risk or severity of adverse effects can be increased when Cetirizine is combined with Pizotifen. 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 Piritramide is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Scopolamine. The risk or severity of adverse effects can be increased when Methohexital is combined with Cetirizine. The risk or severity of adverse effects can be increased when Mepivacaine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Trans-2-Phenylcyclopropylamine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Ziconotide. 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 Cetirizine is combined with Levocetirizine. 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 Oxethazaine is combined with Cetirizine. Cetirizine may increase the central nervous system depressant (CNS depressant) activities of Mirtazapine. 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 Butethal is combined with Cetirizine. Cetirizine may increase the central nervous system depressant (CNS depressant) activities of Ethanol. The risk or severity of adverse effects can be increased when Cetirizine is combined with Ethotoin. The risk or severity of adverse effects can be increased when Cetirizine is combined with Alaproclate. 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 Fluspirilene is combined with Cetirizine. The risk or severity of adverse effects can be increased when Zuclopenthixol is combined with Cetirizine. The risk or severity of adverse effects can be increased when Fospropofol is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Methsuximide. 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 Sertindole is combined with Cetirizine. The risk or severity of adverse effects can be increased when Diphenoxylate is combined with Cetirizine. The risk or severity of adverse effects can be increased when Fludiazepam is combined with Cetirizine. 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 Cetirizine is combined with Levomilnacipran. Phentermine may decrease the sedative activities of 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 Tetracaine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Chlorpromazine 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 Baclofen is combined with Cetirizine. The risk or severity of adverse effects can be increased when Loxapine 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 Maprotiline. Cetirizine may increase the central nervous system depressant (CNS depressant) activities of Hydrocodone. 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 Fencamfamine is combined with Cetirizine. Cetirizine may increase the sedative activities of Rotigotine. Dextroamphetamine may decrease the sedative activities of Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Milnacipran. The risk or severity of adverse effects can be increased when Isoflurane 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 Bromperidol is combined with Cetirizine. The risk or severity of adverse effects can be increased when Lurasidone is combined with Cetirizine. The risk or severity of adverse effects can be increased when Amisulpride 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 Prilocaine is combined with Cetirizine. Cetirizine may increase the sedative activities of Pramipexole. 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 Pentazocine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Perospirone 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 Cetirizine is combined with Metaxalone. The risk or severity of adverse effects can be increased when Halothane is combined with Cetirizine. The risk or severity of adverse effects can be increased when Alprazolam is combined with Cetirizine. The risk or severity of adverse effects can be increased when Dextromoramide is combined with Cetirizine. The risk or severity of adverse effects can be increased when Chlorprothixene is combined with Cetirizine. The risk or severity of adverse effects can be increased when Chloral hydrate is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Fosphenytoin. 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 Carisoprodol. 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 Cetirizine is combined with Clomipramine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Cyproheptadine. The risk or severity of adverse effects can be increased when Fluphenazine is combined with Cetirizine. MMDA may decrease the sedative activities of 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 Cetirizine is combined with Clidinium. Chlorphentermine may decrease the sedative activities of Cetirizine. The risk or severity of adverse effects can be increased when Codeine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Butamben is combined with Cetirizine. The risk or severity of adverse effects can be increased when Aripiprazole is combined with Cetirizine. The risk or severity of adverse effects can be increased when Flunitrazepam 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 Sertraline. The risk or severity of adverse effects can be increased when Ethyl chloride is combined with Cetirizine. The risk or severity of adverse effects can be increased when Trichloroethylene 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 Cetirizine is combined with Dantrolene. The risk or severity of adverse effects can be increased when Butorphanol is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Paroxetine. The risk or severity of adverse effects can be increased when Clemastine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Bupivacaine is combined with Cetirizine. Hydroxyamphetamine may decrease the sedative activities of Cetirizine. Perampanel may increase the central nervous system depressant (CNS depressant) activities of Cetirizine. The risk or severity of adverse effects can be increased when Ketobemidone is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Fluoxetine. 3,4-Methylenedioxyamphetamine may decrease the sedative activities of Cetirizine. Cetirizine may increase the central nervous system depressant (CNS depressant) activities of Azelastine.