Has anyone experienced hallucinations whilst on Venlafaxine? My dose has been increased to 225mg & literally within hours of taking it I was having weird hallucinations & laughing hysterically. My heart was racing too & I was absolutely terrified. I honestly thought I was dying. I went back to the GP & he decreased the dose. He also checked my pulse & it was sky high, so he is sending me for an ECG. I've to stay on a lower dose till my results are back. I wish they'd told me all this at the start, I was told to expect a bit of nausea but that was it! Has anyone else experienced this?