Cocaine use causes an extreme decrease in appetite to the point of not eating anything for days. Monitor what and when your child is eating when home.
Cocaine use causes a surge in energy. A cocaine user will constantly be moving about, even when he/she is supposed to be sleeping.
Due to a lack of appetite associated with cocaine use, a sudden and sharp weight lose will occur.
Look for signs of paranoia. Most cocaine users are paranoid about the police being around or by their friends knowing about their addiction.
Physical signs of cocaine use include dilated pupils, dry mouth and a very dry nose. Cocaine users will continuously wipe their nose, thinking it is runny, but is actually dry inside. Another sign is irritability and an unreasonable perception of reality.
If any of the above "symptoms" pertain to your child, contact your doctor immediately and seek help.