This is particularly important in patients taking venlafaxine, which has been noted to produce sustained increase in diastolic blood pressure and heart rate as side effect. Chest pain, irregular heartbeat, heart failure, heart attack, QT prolongation in the EKG high cholesterol, kidney disease, liver disease, seizure disorder, history of stroke, thyroid problems, low sodium in the blood. Pediatric Patients: Decreased appetite has been observed in kjope venlafaxine gratis konsultasjon pediatric patients receiving Effexor XR. The long-term effects on neurobehavior have not been studied. CNS-Active Drugs The risk of using venlafaxine in combination with other CNS-active drugs has not been systematically evaluated except in the case of those CNS-active drugs noted above. Mg day for to days, to allow new patients to adjust to the medication before increasing to 75 mg day.