You may notice many physical or emotional changes in someone who is using drugs. Common changes include:

• Red eyes, sore throat, dry cough, and fatigue (in the absence of allergies).
• Changes in sleeping or eating habits.
• Moodiness, hostility, or abusive behavior.
• Lying and having poor family relationships.
• Work or school problems, poor attendance.
• Loss of interest in favorite activities.
• Social withdrawal or changes in friends.
• Problems with the law, such as arrests for stealing, driving under the influence (DUI), or driving while impaired (DWI).
• Decreased interest in sex.