MMDA may decrease the sedative activities of 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 Levomethadyl Acetate is combined with 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 Proparacaine 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 Dextromoramide is combined with Cetirizine. The risk or severity of adverse effects can be increased when Glutethimide 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 Butorphanol is combined with Cetirizine. The risk or severity of adverse effects can be increased when Benperidol is combined with Cetirizine. The risk or severity of adverse effects can be increased when Deramciclane 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 Nalbuphine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Tandospirone is combined with Cetirizine. The risk or severity of adverse effects can be increased when Oxazepam is combined with Cetirizine. The risk or severity of adverse effects can be increased when Tiapride is combined with Cetirizine. The risk or severity of adverse effects can be increased when Ketazolam is combined with Cetirizine. The risk or severity of adverse effects can be increased when Methylphenobarbital is combined with Cetirizine. The risk or severity of adverse effects can be increased when Risperidone is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Flunarizine. 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 Cetirizine is combined with Protriptyline. The risk or severity of adverse effects can be increased when Cetirizine is combined with Etoperidone. 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 Dapiprazole is combined with Cetirizine. The risk or severity of adverse effects can be increased when Procaine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Meprobamate 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 Amperozide 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 clomethiazole 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 Halazepam 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 Ethyl carbamate is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Dexbrompheniramine. The risk or severity of adverse effects can be increased when Carfentanil is combined with 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 Cetirizine is combined with Milnacipran. The risk or severity of adverse effects can be increased when Barbital is combined with Cetirizine. The risk or severity of adverse effects can be increased when Ethylmorphine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Articaine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Indalpine. The risk or severity of adverse effects can be increased when Pethidine 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 Lidocaine is combined with Cetirizine. Mephedrone may decrease the sedative activities of Cetirizine. The risk or severity of adverse effects can be increased when Loprazolam is combined with 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 Sufentanil is combined with Cetirizine. The risk or severity of adverse effects can be increased when Temazepam is combined with Cetirizine. The therapeutic efficacy of Cetirizine can be increased when used in combination with Pregabalin. The risk or severity of adverse effects can be increased when Cetirizine is combined with Doxepin. The risk or severity of adverse effects can be increased when Drotebanol is combined with Cetirizine. Dronabinol may increase the central nervous system depressant (CNS depressant) activities of Cetirizine. 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 Bupivacaine 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 Oxethazaine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Alprazolam is combined with Cetirizine. Cetirizine may increase the sedative activities of Ropinirole. 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 Quazepam is combined with Cetirizine. Doxylamine may increase the central nervous system depressant (CNS depressant) activities of Cetirizine. 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 Normethadone is combined with Cetirizine. The risk or severity of adverse effects can be increased when Trifluoperazine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Ritanserin is combined with Cetirizine. 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 Tetrodotoxin is combined with Cetirizine. The risk or severity of adverse effects can be increased when Hydromorphone is combined with Cetirizine. Cetirizine may increase the central nervous system depressant (CNS depressant) activities of Suvorexant. The risk or severity of adverse effects can be increased when Cetirizine is combined with Ethosuximide. Midomafetamine may decrease the sedative activities of Cetirizine. The risk or severity of adverse effects can be increased when Etidocaine 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 Pipotiazine. The risk or severity of adverse effects can be increased when Alphacetylmethadol is combined with Cetirizine. Hydroxyamphetamine may decrease the sedative 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 Secobarbital is combined with Cetirizine. The therapeutic efficacy of Betahistine can be decreased when used in combination with 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 Cetirizine is combined with Desloratadine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Pomalidomide. The risk or severity of adverse effects can be increased when Eszopiclone is combined with Cetirizine. Cetirizine may increase the central nervous system depressant (CNS depressant) activities of Hydrocodone. 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 Sevoflurane is combined with 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 Paliperidone is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Cyclizine. The risk or severity of adverse effects can be increased when Butabarbital 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 Oxymorphone is combined with Cetirizine. The risk or severity of adverse effects can be increased when Etizolam is combined with Cetirizine. The risk or severity of adverse effects can be increased when Vortioxetine 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 Nitrazepam is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Vigabatrin. The risk or severity of adverse effects can be increased when Cetirizine is combined with Clidinium. 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 Cetirizine is combined with Levetiracetam. The risk or severity of adverse effects can be increased when Cetirizine is combined with Meclizine. Methamphetamine may decrease the sedative activities of Cetirizine. The risk or severity of adverse effects can be increased when Levobupivacaine is combined with 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 Dyclonine is combined with Cetirizine. Droperidol may increase the central nervous system depressant (CNS depressant) activities of 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 Eltanolone is combined with Cetirizine. The risk or severity of adverse effects can be increased when 7-Nitroindazole is combined with Cetirizine. 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 Methadone is combined with Cetirizine. The risk or severity of adverse effects can be increased when Chloroprocaine is combined with Cetirizine. Cetirizine may increase the central nervous system depressant (CNS depressant) activities of Mirtazapine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Fluoxetine. The risk or severity of adverse effects can be increased when Buspirone is combined with Cetirizine. Ritobegron may decrease the sedative activities of Cetirizine. The risk or severity of adverse effects can be increased when Thiopental 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 Ethchlorvynol is combined with Cetirizine. Brimonidine may increase the central nervous system depressant (CNS depressant) activities of 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 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 Cetirizine is combined with Levocetirizine. 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 Midazolam is combined with Cetirizine.