Tara Reid was clearly slurring her words and seemed barely coherent when a concerned bystander called 911 after she claims she was drugged in a Chicago-area hotel ... and, we've got the audio for you to listen to.

The call -- placed by someone who seems to work at the hospital because she refers to Tara as a "guest" -- says Reid is "really inebriated" ... and adding she can't even hold herself up in a wheelchair.

The caller calls Tara "Ms. Reid" multiple times ... saying it louder and louder, seemingly in an attempt to get her attention -- and Tara responds with a series of groans and other mumbled noises instead of annunciated words.

Tara isn't vomitting blood or breathing abnormally, the caller tells the 911 operator ... though she adds the hotel is concerned she might fall and hit

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