A Casper man has admitted he illegally obtained prescription drugs.

Jacob Large has entered a  guilty plea to one count of prescription fraud after prosecutors say he tried to alter his prescription.

Investigators say Large went to a pharmacy in June, to have a prescription filled, but employees got suspicious about one of the prescribed medicines.

They attempted to contact the doctor to verify, and later received a voice mail from what turned out to be Large, impersonating the doctor, giving the ok.

When interviewed, the doctor provided a copy of the original prescription, which did not have the third medication on it.

Large later admitted to police to forging a third medication, and trying to impersonate his doctor.