- Altered CNS Neurotransmitters
- Antidepressant Medications
- Centrally acting Antihypertensive Medications
- Beta Blockers
- Rauwolfia alkaloids
- Alpha Adrenergic Agonists (e.g. Clonidine)
- Antiparkinsonian Medications
- Alcohol Abuse with withdrawal
- Barbiturate Abuse with withdrawal
- Benzodiazepine Abuse with withdrawal
- Miscellaneous medications
- Flutamide
- Procarbazine
- Ketamine
- Short-acting Barbiturates