Final answer:
Symptoms of a nortriptyline overdose include seizures, coma, agitation, and hallucinations, in addition to anxiety, sleep problems, nausea, abnormal heart rhythms, and muscular problems.
Step-by-step explanation:
Some of the more critical symptoms comprise seizures, coma, agitation, and hallucinations. In addition to these, an overdose may also cause symptoms such as anxiety, sleep problems, nausea and vomiting, abnormal heart rhythms, low blood pressure, and muscular problems. Individuals need to seek immediate medical attention if an overdose is suspected as it can be life-threatening. Treatment for an overdose typically aims at stabilizing the patient's vital signs and managing any symptoms.