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A member asked:
Why is it that hallucinogens such as lsd cause your pupils to dilate?
A doctor has provided 1 answer
Pupil dilation: Hallucinogens like lsd are agonists of the serotonergic 5-ht2a receptors in the brain -- and in this way they can cause pupils to dilate. Serotonergic antidepressants can do this also.
Answered 1/29/2014
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