Answer 5:
Consider norepinephrine, phenylephrine, epinephrine or high dose dopamine.
Mechanism of action of TCA's
  1. Induce the release of norepinephrine and then inhibits its reuptake at nerve terminals.
  2. Also are direct alpha adrenergic blockers
  3. Thirdly membrane stabilizing effect
  4. Anticholinergic effect

done