My cat advice would be to use caution, especially if one is taking more than 100 mgs per day of venlafaxine. If venlafaxine is suddenly discontinued, withdrawal syndrome involving fatigue, nausea, dizziness, headache, insomnia, and nervousness may develop. These reactions have included tremor, myoclonus, diaphoresis, nausea, vomiting, flushing, dizziness, hyperthermia with features resembling neuroleptic malignant syndrome, seizures, and death. The risk increases when this medication is used with certain other drugs such as triptans used to treat migraine headaches. Check the label on the medicine for exact dosing instructions. In addition, the haloperidol Cmax increased 88 when coadministered with venlafaxine, but the haloperidol elimination half-life t1 was unchanged. venlafaxine preise Abrupt discontinuation or dose reduction of venlafaxine at various doses has been found to be associated with the appearance of new symptoms, the frequency of which increased with increased dose level and with longer duration of treatment.