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Drugs can cause a pupil to change in two ways by dilation making the pupil larger or constricting the pupils.â¦ Only two drugs constrict the pupils those being opiates and alcohol. So anything but, these can cause the pupils to dilate.
  Certain drugs cause constriction of the pupils, such as alcohol and opioids. Other drugs, such as atropine, marijuana, LSD, cocaine, mescaline, psilocybin mushrooms, â¦ and amphetamines cause pupil dilation.+ 87 others found this useful.John Curtis.ost recreational drugs can dilate your pupils except for opiates, also some anti-depressants like Prozac can dilate the pupils. People say weed makes pupils a tiny bit bigger but it is mainly the bloodshot eye which is noticable when high.