What is NOT a symptom of depressant use?

Heightened anxiety is not typically associated with depressant use. Depressants, such as alcohol or benzodiazepines, are substances that generally reduce the activity of the central nervous system, leading to symptoms like relaxation, sedation, and decreased anxiety. Instead of increasing anxiety, depressants often create a calming effect, which contrasts with the heightened anxiety indicated in the question.

In the context of the other symptoms, slow movements, facial itching, and constipation can all be related to the use of depressants. Slow movements are a direct physical effect of the sedative qualities of these substances, while facial itching can occur due to certain types of depressants or allergies to substances. Constipation is also a potential side effect, as depressants can impact gastrointestinal function. Therefore, the key point is that heightened anxiety contradicts the expected effects of depressants, making it the correct choice for what is not a symptom of depressant use.