Octamoxin may increase the serotonergic activities of Venlafaxine. The serum concentration of Venlafaxine can be increased when it is combined with Mifepristone. The metabolism of Vismodegib can be decreased when combined with Venlafaxine. The risk or severity of adverse effects can be increased when Etizolam is combined with Venlafaxine. Venlafaxine may increase the QTc-prolonging activities of Chloroquine. The risk or severity of adverse effects can be increased when Vortioxetine is combined with Venlafaxine. Venlafaxine may increase the tachycardic activities of Racepinephrine. The therapeutic efficacy of Venlafaxine can be decreased when used in combination with Cyproheptadine. The risk or severity of adverse effects can be increased when Nitrous oxide is combined with Venlafaxine. Hydracarbazine may increase the serotonergic activities of Venlafaxine. Venlafaxine may decrease the antihypertensive activities of Ephedra. The therapeutic efficacy of Liotrix can be decreased when used in combination with Venlafaxine. The metabolism of Grepafloxacin can be decreased when combined with Venlafaxine. The metabolism of Venlafaxine can be increased when combined with Nevirapine. The metabolism of Prazepam can be decreased when combined with Venlafaxine. The metabolism of Venlafaxine can be decreased when combined with Lobeglitazone. The metabolism of Praziquantel can be decreased when combined with Venlafaxine. Venlafaxine may increase the hypoglycemic activities of Insulin Detemir. The risk or severity of adverse effects can be increased when Venlafaxine is combined with Tranylcypromine. The metabolism of Roxithromycin can be decreased when combined with Venlafaxine. Venlafaxine may increase the QTc-prolonging activities of Flecainide. The risk or severity of adverse effects can be increased when Tetracaine is combined with Venlafaxine. Iproniazid may increase the serotonergic activities of Venlafaxine. Venlafaxine may increase the antiplatelet activities of Valdecoxib. The metabolism of Etonogestrel can be decreased when combined with Venlafaxine. The metabolism of Bisoprolol can be decreased when combined with Venlafaxine. The metabolism of Venlafaxine can be increased when combined with Phenytoin. The metabolism of Venlafaxine can be increased when combined with Rifapentine. The metabolism of Synthetic Conjugated Estrogens, B can be decreased when combined with Venlafaxine. The metabolism of Yohimbine can be decreased when combined with Venlafaxine. Venlafaxine may increase the QTc-prolonging activities of Pentamidine. The metabolism of Digitoxin can be decreased when combined with Venlafaxine. The metabolism of Venlafaxine can be decreased when combined with Clotrimazole. The serum concentration of Penbutolol can be increased when it is combined with Venlafaxine. Venlafaxine may increase the serotonergic activities of Alaproclate. The metabolism of Nifedipine can be decreased when combined with Venlafaxine. Dextromoramide may increase the serotonergic activities of Venlafaxine. The metabolism of Halothane can be decreased when combined with Venlafaxine. The risk or severity of adverse effects can be increased when Benzocaine is combined with Venlafaxine. Venlafaxine may increase the tachycardic activities of Naphazoline. Toloxatone may increase the serotonergic activities of Venlafaxine. The risk or severity of adverse effects can be increased when Eltanolone is combined with Venlafaxine. The metabolism of Venlafaxine can be increased when combined with Phenobarbital. The metabolism of Venlafaxine can be decreased when combined with Tolbutamide. The serum concentration of Dapoxetine can be increased when it is combined with Venlafaxine. The risk or severity of adverse effects can be increased when Norflurane is combined with Venlafaxine. The risk or severity of adverse effects can be increased when Levocabastine is combined with Venlafaxine. The metabolism of Pindolol can be decreased when combined with Venlafaxine. The metabolism of Lomustine can be decreased when combined with Venlafaxine. The serum concentration of Bosutinib can be increased when it is combined with Venlafaxine. The metabolism of Sirolimus can be decreased when combined with Venlafaxine. Venlafaxine may increase the tachycardic activities of Adrafinil. The metabolism of Seratrodast can be decreased when combined with Venlafaxine. The metabolism of Malathion can be decreased when combined with Venlafaxine. The metabolism of Diphenhydramine can be decreased when combined with Venlafaxine. The metabolism of Esmirtazapine can be decreased when combined with Venlafaxine. Venlafaxine may increase the serotonergic activities of Olanzapine. The metabolism of Methylprednisolone can be decreased when combined with Venlafaxine. The metabolism of Metronidazole can be decreased when combined with Venlafaxine. The metabolism of Quinacrine can be decreased when combined with Venlafaxine. The serum concentration of Pazopanib can be increased when it is combined with Venlafaxine. The metabolism of Zidovudine can be decreased when combined with Venlafaxine. Venlafaxine may increase the QTc-prolonging activities of Ofloxacin. The metabolism of Venlafaxine can be decreased when combined with Fosamprenavir. The metabolism of Perhexiline can be decreased when combined with Venlafaxine. The metabolism of Macitentan can be decreased when combined with Venlafaxine. The metabolism of Indacaterol can be decreased when combined with Venlafaxine. The risk or severity of adverse effects can be increased when Venlafaxine is combined with Moclobemide. The serum concentration of Lomitapide can be increased when it is combined with Venlafaxine. The metabolism of Bezafibrate can be decreased when combined with Venlafaxine. The metabolism of Levodopa can be decreased when combined with Venlafaxine. The serum concentration of Ledipasvir can be increased when it is combined with Venlafaxine. The serum concentration of the active metabolites of Ifosfamide can be reduced when Ifosfamide is used in combination with Venlafaxine resulting in a loss in efficacy. The metabolism of Oxymorphone can be decreased when combined with Venlafaxine. The serum concentration of Eletriptan can be increased when it is combined with Venlafaxine. The risk or severity of adverse effects can be increased when Nabilone is combined with Venlafaxine. Pentazocine may increase the serotonergic activities of Venlafaxine. The risk or severity of adverse effects can be increased when Venlafaxine is combined with Atorvastatin. The metabolism of Hydromorphone can be decreased when combined with Venlafaxine. The risk or severity of adverse effects can be increased when Mepivacaine is combined with Venlafaxine. Venlafaxine may increase the tachycardic activities of Clenbuterol. The metabolism of Venlafaxine can be decreased when combined with Paroxetine. The serum concentration of Platelet Activating Factor can be increased when it is combined with Venlafaxine. The metabolism of Timolol can be decreased when combined with Venlafaxine. The metabolism of Ivermectin can be decreased when combined with Venlafaxine. The risk or severity of adverse effects can be increased when Venlafaxine is combined with Maprotiline. The metabolism of Tiotropium can be decreased when combined with Venlafaxine. The metabolism of Venlafaxine can be decreased when combined with Valproic Acid. The risk or severity of adverse effects can be increased when Methocarbamol is combined with Venlafaxine. Venlafaxine may increase the QTc-prolonging activities of Chlorpromazine. The risk or severity of adverse effects can be increased when Oxethazaine is combined with Venlafaxine. The serum concentration of Dronabinol can be increased when it is combined with Venlafaxine. The metabolism of Bupivacaine can be decreased when combined with Venlafaxine. The serum concentration of Venlafaxine can be decreased when it is combined with St. John's Wort. The serum concentration of Indenolol can be increased when it is combined with Venlafaxine. The risk or severity of adverse effects can be increased when Venlafaxine is combined with Perospirone. Venlafaxine may increase the hypoglycemic activities of Pramlintide. 7,8-Dichloro-1,2,3,4-tetrahydroisoquinoline may increase the serotonergic activities of Venlafaxine. Venlafaxine may increase the hypoglycemic activities of Insulin Aspart. Venlafaxine may increase the tachycardic activities of Pirbuterol. Furazolidone may increase the serotonergic activities of Venlafaxine. The metabolism of Venlafaxine can be decreased when combined with Atazanavir. The metabolism of Zolpidem can be decreased when combined with Venlafaxine. Venlafaxine may increase the QTc-prolonging activities of Telavancin. The metabolism of Propoxyphene napsylate can be decreased when combined with Venlafaxine. The metabolism of Baricitinib can be decreased when combined with Venlafaxine. The metabolism of Dasabuvir can be decreased when combined with Venlafaxine. The metabolism of Regorafenib can be decreased when combined with Venlafaxine. Venlafaxine may increase the hyponatremic activities of Quinethazone. The metabolism of Albendazole can be decreased when combined with Venlafaxine. The metabolism of Betaxolol can be decreased when combined with Venlafaxine. The serum concentration of Thioridazine can be increased when it is combined with Venlafaxine. The risk or severity of adverse effects can be increased when Dimenhydrinate is combined with Venlafaxine. The metabolism of Raloxifene can be decreased when combined with Venlafaxine. The metabolism of Esomeprazole can be decreased when combined with Venlafaxine. The metabolism of Venlafaxine can be decreased when combined with Nicardipine. Pivhydrazine may increase the serotonergic activities of Venlafaxine. The metabolism of Buprenorphine can be decreased when combined with Venlafaxine. The risk or severity of adverse effects can be increased when Venlafaxine is combined with Osanetant. The metabolism of Ponatinib can be decreased when combined with Venlafaxine. The metabolism of Prednisone can be decreased when combined with Venlafaxine. Venlafaxine may increase the tachycardic activities of Ritobegron. The metabolism of Fluvastatin can be decreased when combined with Venlafaxine. Venlafaxine may decrease effectiveness of Ioflupane I-123 as a diagnostic agent. Venlafaxine may increase the QTc-prolonging activities of Bedaquiline. The risk or severity of adverse effects can be increased when Indiplon is combined with Venlafaxine. The serum concentration of Bopindolol can be increased when it is combined with Venlafaxine. Normethadone may increase the serotonergic activities of Venlafaxine. The metabolism of Ropinirole can be decreased when combined with Venlafaxine. The risk or severity of adverse effects can be increased when Venlafaxine is combined with Ecopipam.