"my doc prescribed 40 mg at bedtime to shift my sleep cycle.  history of acute anxiety attacks w/ tachycardia, and essential tremor.  first dose i felt agitated, anxious, and my heart rate went up to 160.  it did not help me fall asleep any earlier, next day blurred vision and &#039;migraine aura&#039;.  things went downhill from there.  my doctor said to continue it for at least 4 weeks and the side effects would go away.  they did not - things continued to worsen.  the tremor increased to where i could not use the computer, headaches got worse, anxiety increased, i became irritable and angry, and my blood sugar went through the roof.  after 5 weeks i threw it away - blood sugar still high and tremor still worse after quitting a month ago."