Final answer:
Epinephrine is the first drug commonly administered for severe symptomatic bradycardia associated with respiratory distress.
Step-by-step explanation:
The first drug commonly administered for severe symptomatic bradycardia associated with respiratory distress is epinephrine. Epinephrine acts as a positive chronotropic and inotropic agent, increasing the heart rate and improving cardiac output. It also helps to alleviate respiratory distress by relaxing the smooth muscles of the airways.