Constricted pupils that fail to respond to light.

Lethargy or drowsiness.

Difficulty in concentration.

Euphoria.

Slurred speech.

Nausea, vomiting, and other flulike symptoms.

The following organizations provide a wide variety of information about heroin, including where to find treatment and support groups for heroin addicts. Local phone books generally list service referral and hot-line numbers for these services in each state.