At 12 months of age, landmarks of normal behavioral development include the following:
* Sits alone with good coordination
* Creeps
* Pulls self to standing position
* Points with index finger
* Matches two objects at midline
* Attempts to imitate scribble
* Develops separation anxiety when away from mother
* Responds to social play such as peek-a-boo
* Feeds self a cracker and holds own bottle

Tiagabine is a non-benzodiazepine anxiolytic that is prescribed as an off-label adjunct medication possibly helpful for anxiety symptoms.
Alprazolam and clonazepam are both benzodiazepine. Clonidine is an alpha-agonist sometimes prescribed for anxiety in children. Furosemide is not used to treat anxiety.

Patients suffering from anhedonia present with a decrease in dopamine activity.
Patients suffering from psychosis and schizophrenia present with an increase in dopamine activity. Patients suffering from anxiety disorders present with a decrease in gamma-aminobutyric acid. Patients suffering from obsessive-compulsive disorders present with a decrease in serotonin activity.

Other positive symptom clusters are hallucinations, delusions, disorganized behaviors, hostility, grandiosity, mania, and paranoia.
Negative symptom clusters include affective flattening, alogia or poverty of speech, avolition, apathy, abstract-thinking problems, anhedonia, and attention deficits.
Associated symptom clusters include inappropriate affect, dysphoric mood, depersonalization, derealization, and high anxiety.

This man is exhibiting the usual signs of delirium, including impaired consciousness, difficulty with cognition, and disorientation. Haloperidol is an antipsychotic, and it is usually the drug of choice for managing an agitated or confused patient with delirium. Usually, haloperidol is prescribed as 0.5 mg every 8 hours as needed for agitation or confusion. It comes in intramuscular, IV, and oral forms.
Diphenhydramine and benztropine possess anticholinergic properties that would worsen delirium. Lorazepam should be avoided in older adults because it can cause a paradoxical effect, resulting in worsened agitation.