The metabolism of Formoterol can be decreased when combined with Valproic Acid. The serum concentration of Valproic Acid can be decreased when it is combined with Phosphoramidon. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Flibanserin. Valproic Acid may increase the sedative activities of Metyrosine. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Trazodone. The metabolism of Venlafaxine can be decreased when combined with Valproic Acid. The serum concentration of Valproic Acid can be decreased when it is combined with Thiorphan. The serum concentration of Valproic Acid can be decreased when it is combined with Antithrombin III human. The serum concentration of the active metabolites of Carbamazepine can be increased when Carbamazepine is used in combination with Valproic Acid. The serum concentration of Valproic Acid can be decreased when it is combined with Batimastat. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Articaine. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Benzocaine. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Normethadone. The risk or severity of adverse effects can be increased when Zuclopenthixol is combined with Valproic Acid. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Cyproheptadine. The metabolism of Dapsone can be decreased when combined with Valproic Acid. The risk or severity of adverse effects can be increased when Quetiapine is combined with Valproic Acid. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Temozolomide. The risk or severity of adverse effects can be increased when Trifluoperazine is combined with Valproic Acid. Doxylamine may increase the central nervous system depressant (CNS depressant) activities of Valproic Acid. The risk or severity of adverse effects can be increased when Alfentanil is combined with Valproic Acid. The risk or severity of adverse effects can be increased when Temazepam is combined with Valproic Acid. The metabolism of Celecoxib can be decreased when combined with Valproic Acid. The serum concentration of Mevastatin can be increased when it is combined with Valproic Acid. The serum concentration of Valproic Acid can be increased when it is combined with Felbamate. The risk or severity of adverse effects can be increased when Eszopiclone is combined with Valproic Acid. The serum concentration of Valproic Acid can be decreased when it is combined with Ecabet. The metabolism of Enasidenib can be decreased when combined with Valproic Acid. The metabolism of Valproic Acid can be decreased when combined with Cyclosporine. The metabolism of Rupatadine can be decreased when combined with Valproic Acid. The risk or severity of adverse effects can be increased when Fentanyl is combined with Valproic Acid. The metabolism of Valproic Acid can be decreased when combined with Cimetidine. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Tiagabine. The metabolism of Valproic Acid can be decreased when combined with Irbesartan. The serum concentration of Valproic Acid can be decreased when it is combined with Nelfinavir. The metabolism of Mestranol can be decreased when combined with Valproic Acid. The metabolism of Valproic Acid can be decreased when combined with Ticlopidine. The risk or severity of adverse effects can be increased when Fluphenazine is combined with Valproic Acid. The risk or severity of adverse effects can be increased when Perphenazine is combined with Valproic Acid. The metabolism of Primidone can be decreased when combined with Valproic Acid. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Levodopa. The serum concentration of Valproic Acid can be decreased when it is combined with Trandolapril. The risk or severity of adverse effects can be increased when Prochlorperazine is combined with Valproic Acid. The serum concentration of Cilostazol can be increased when it is combined with Valproic Acid. The serum concentration of Valproic Acid can be decreased when it is combined with Telaprevir. The metabolism of Valproic Acid can be decreased when combined with Chloramphenicol. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Sepranolone. The serum concentration of Valproic Acid can be decreased when it is combined with Rifampicin. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Aceprometazine. The risk or severity of adverse effects can be increased when Buspirone is combined with Valproic Acid. The risk or severity of adverse effects can be increased when Diphenhydramine is combined with Valproic Acid. The serum concentration of Valproic Acid can be decreased when it is combined with Vildagliptin. The metabolism of Lansoprazole can be decreased when combined with Valproic Acid. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Clobazam. The metabolism of Prasugrel can be decreased when combined with Valproic Acid. The metabolism of Zaltoprofen can be decreased when combined with Valproic Acid. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Allopregnanolone. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Alaproclate. The metabolism of Trimethoprim can be decreased when combined with Valproic Acid. The risk or severity of adverse effects can be increased when Diphenoxylate is combined with Valproic Acid. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Ecopipam. The serum concentration of Valproic Acid can be decreased when it is combined with Isoflurophate. The serum concentration of Valproic Acid can be decreased when it is combined with Ertapenem. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Alphacetylmethadol. The risk or severity of adverse effects can be increased when Sufentanil is combined with Valproic Acid. The metabolism of Leflunomide can be decreased when combined with Valproic Acid. The serum concentration of Valproic Acid can be decreased when it is combined with Simeprevir. The serum concentration of Valproic Acid can be decreased when it is combined with Tipranavir. The metabolism of Valproic Acid can be decreased when combined with Sorafenib. The metabolism of Valproic Acid can be decreased when combined with Manidipine. The serum concentration of Ibrutinib can be increased when it is combined with Valproic Acid. The serum concentration of Valproic Acid can be decreased when it is combined with Spirapril. Valproic Acid may increase the central nervous system depressant (CNS depressant) activities of Orphenadrine. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Dapoxetine. The serum concentration of Valproic Acid can be decreased when it is combined with Edoxaban. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Sertindole. Valproic Acid may increase the central nervous system depressant (CNS depressant) activities of Buprenorphine. The serum concentration of Valproic Acid can be decreased when it is combined with Dabigatran etexilate. The serum concentration of Valproic Acid can be decreased when it is combined with Captopril. The serum concentration of Valproic Acid can be decreased when it is combined with Linagliptin. The serum concentration of Valproic Acid can be decreased when it is combined with Omapatrilat. The risk or severity of adverse effects can be increased when Promazine is combined with Valproic Acid. The metabolism of Sulfinpyrazone can be decreased when combined with Valproic Acid. The metabolism of Paclitaxel can be decreased when combined with Valproic Acid. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Olopatadine. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Escitalopram. The risk or severity of adverse effects can be increased when Etomidate is combined with Valproic Acid. The risk or severity of adverse effects can be increased when Ergotamine is combined with Valproic Acid. The serum concentration of Valproic Acid can be decreased when it is combined with Rivaroxaban. The metabolism of Valproic Acid can be decreased when combined with Bortezomib. The metabolism of Paramethadione can be decreased when combined with Valproic Acid. The metabolism of Seratrodast can be decreased when combined with Valproic Acid. The metabolism of Ketoprofen can be decreased when combined with Valproic Acid. The serum concentration of Fosphenytoin can be decreased when it is combined with Valproic Acid. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Perazine. The serum concentration of Valproic Acid can be decreased when it is combined with Candoxatrilat. The serum concentration of Valproic Acid can be decreased when it is combined with Ixazomib. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Tetracaine. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Deramciclane. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Butethal. The metabolism of Lornoxicam can be decreased when combined with Valproic Acid. The metabolism of Torasemide can be decreased when combined with Valproic Acid. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Brompheniramine. The serum concentration of Valproic Acid can be decreased when it is combined with Fosamprenavir. The serum concentration of Valproic Acid can be decreased when it is combined with S-3304. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Flunarizine. The metabolism of Theophylline can be decreased when combined with Valproic Acid. The serum concentration of Rufinamide can be increased when it is combined with Valproic Acid. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Piritramide. The serum concentration of Valproic Acid can be increased when it is combined with Ceritinib. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Methylecgonine. The therapeutic efficacy of Phenylbutyric acid can be decreased when used in combination with Valproic Acid. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Cetirizine. The serum concentration of Valproic Acid can be decreased when it is combined with Moexipril. The serum concentration of Valproic Acid can be decreased when it is combined with Bivalirudin. The metabolism of Progesterone can be decreased when combined with Valproic Acid. The risk or severity of adverse effects can be increased when Metergoline is combined with Valproic Acid. The therapeutic efficacy of Benzoic Acid can be decreased when used in combination with Valproic Acid. The metabolism of Valproic Acid can be decreased when combined with Voriconazole. The metabolism of Eletriptan can be decreased when combined with Valproic Acid. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Entacapone. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Brexpiprazole. The metabolism of Lesinurad can be decreased when combined with Valproic Acid. The metabolism of Estrone can be decreased when combined with Valproic Acid. The risk or severity of adverse effects can be increased when Tramadol is combined with Valproic Acid. The risk or severity of adverse effects can be increased when Valproic Acid is combined with Methoxyflurane. The risk or severity of adverse effects can be increased when Thiothixene is combined with Valproic Acid. The serum concentration of Valproic Acid can be decreased when it is combined with Zofenopril. The metabolism of Valproic Acid can be decreased when combined with Lovastatin. The metabolism of Valproic Acid can be decreased when combined with Losartan.