Which symptom is indicative of antidepressant toxicity?

Confusion is indeed a symptom that can indicate antidepressant toxicity. In cases of overdose or toxicity from antidepressant medications, especially those that affect serotonin levels or are tricyclic antidepressants, central nervous system effects are common. Confusion may manifest as altered mental status, agitation, or even delirium, highlighting the impact of the medications on neurotransmitter balances and brain function.

Other symptoms that may appear with toxicity include fluctuating levels of consciousness, hyperreflexia, or seizures. These reactions demonstrate the potential for antidepressants to affect cognitive processes significantly, necessitating immediate medical attention if toxicity is suspected.

While excessive salivation, respiratory depression, and euphoria can also occur in various contexts related to medication effects or mental health conditions, they are not as directly indicative of antidepressant toxicity as confusion is. Each of those symptoms may be relevant to different medical scenarios or toxic exposures but does not specifically point to antidepressant toxicity in the same way.