Hello XXXXX,
Thank you for using Justanswer for your question.
The medical name for this is "miosis".
One of the most common reasons for pin point pupils are opiate medications.
This is also a side effect of antipsychotic medication, cholininergic medications, and in certain types of brain conditions and disorders.
A good review of most causes is discussed here: http://en.wikipedia.org/wiki/Miosis
I hope this helps. If you have questions, please reply.
Susan
Nurse (RN)
BSN, MSN, CNS