The risk or severity of adverse effects can be increased when Dexmedetomidine is combined with 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 7-Nitroindazole 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 Ethylmorphine 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 Etomidate is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Difenoxin. 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 Cetirizine is combined with Levocetirizine. 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 Iloperidone. The risk or severity of adverse effects can be increased when Cetirizine is combined with Nefazodone. 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 Benzyl alcohol 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 Olanzapine 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 Trimipramine. 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 Paroxetine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Dapoxetine. 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 Etorphine 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 Chloroprocaine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Methoxyflurane is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Ramelteon. The risk or severity of adverse effects can be increased when Quazepam 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 Perazine is combined with Cetirizine. Benzphetamine may decrease the sedative activities of 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 Fluphenazine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Flupentixol is combined with Cetirizine. Hydroxyamphetamine may decrease the sedative activities of Cetirizine. The risk or severity of adverse effects can be increased when Remoxipride 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 Dihydrocodeine 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 Fospropofol 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 Baclofen 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 Oxazepam is combined with Cetirizine. 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 Thiopental 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 Etizolam 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 Prilocaine 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 Dimenhydrinate. The risk or severity of adverse effects can be increased when Alfaxalone 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 Allopregnanolone is combined with Cetirizine. Diethylpropion may decrease the sedative 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 Chlorprothixene is combined with Cetirizine. The risk or severity of adverse effects can be increased when Tranylcypromine 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 Nalbuphine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Levomilnacipran. The risk or severity of adverse effects can be increased when Tramadol is combined with Cetirizine. Pseudoephedrine may decrease the sedative activities of Cetirizine. 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 Prochlorperazine 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 Ritanserin 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 Sertindole 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 Butethal 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 Cetirizine is combined with Levodopa. 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 Lithium 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 Cetirizine is combined with Tizanidine. 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 Cetirizine is combined with Tetrabenazine. 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 Buspirone is combined with Cetirizine. 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 Zuclopenthixol is combined with Cetirizine. The risk or severity of adverse effects can be increased when Fentanyl is combined with Cetirizine. Cetirizine may increase the sedative activities of Rotigotine. 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 Dihydroetorphine is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Amoxapine. 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 Pentobarbital is combined with Cetirizine. The risk or severity of adverse effects can be increased when Cetirizine is combined with Fexofenadine. The risk or severity of adverse effects can be increased when Butalbital 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 Methadyl Acetate 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 Cetirizine is combined with Milnacipran. The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Cetirizine. Cetirizine may increase the central nervous system depressant (CNS depressant) activities of Methotrimeprazine. 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 Tetrodotoxin 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 Indiplon 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 Butorphanol 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 Cetirizine is combined with Desvenlafaxine. The risk or severity of adverse effects can be increased when Lormetazepam is combined with Cetirizine. Lisdexamfetamine may decrease the sedative activities of 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 Trazodone is combined with Cetirizine. The risk or severity of adverse effects can be increased when Ropivacaine is combined with Cetirizine. Dextroamphetamine may decrease the sedative activities of 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 Risperidone 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 Fencamfamine 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 Osanetant 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 Pimozide is combined with Cetirizine. The risk or severity of adverse effects can be increased when Sulpiride 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 Etidocaine is combined with Cetirizine. Chlorphentermine may decrease the sedative activities of 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 Carfentanil 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 Loxapine is combined with Cetirizine.