Some overdoses may make worse a person's chronic disease. For example, an asthma attack or chest pains may be triggered. Vital sign values can be increased, decreased, or completely absent. Sleepiness, confusion, and coma are common. This decrease in mental status can be very dangerous if the person should vomit.
Skin can be cool and sweaty, or hot and dry.
Chest pain is possible and can be caused by heart or lung damage. Shortness of breath may occur. Breathing may get rapid or slow. Abdominal pain, nausea, vomiting, and diarrhea are possible. Vomiting blood, or blood in bowel movements, can be life threatening.