- Amphetamines, cocaine
- Caffeine, nicotine
- Withdrawal from clonidine
- Beta blocker withdrawal
- Beta agonist use (e.g. inhalers)
- Over dose thyroid replacement
- Stimulants used for treating ADHD
- Serotonin syndrome
- Anticholinergic syndrome
- Ask directly about illicits and supplements
- Many others: make sure to review active med list prescribed from all clinicians/health systems w/whom patient interacts