c. Suspect a possible paradoxical reaction to the clorazepate.
Patients taking benzodiazepines for anxiety sometimes develop paradoxical responses to the drug, which include insomnia, excitation, euphoria, heightened anxiety, and rage. A missed dose would trigger withdrawal symptoms, which would include anxiety, insomnia, sweating, tremors, and dizziness. Because this is a paradoxical reaction to the drug, a longer acting drug would make the symptoms worse. This is not caused by overdose, which would manifest as drowsiness, lethargy, and confusion, so a drug level is not warranted.