Which drug acts on all cells including Alpha, Beta, and Beta2 receptors?

Epinephrine is a hormone and neurotransmitter that has a broad range of effects on the body because it acts on multiple adrenergic receptors, including alpha, beta, and specifically beta2 receptors. This versatility allows it to mediate various physiological responses, such as vasodilation, increased heart rate, and bronchodilation.

When epinephrine binds to alpha receptors, it typically causes vasoconstriction and increased blood pressure, which can be beneficial in situations like anaphylaxis. Its action on beta1 receptors primarily affects the heart, increasing heart rate and contractility, while its interaction with beta2 receptors leads to bronchodilation in the lungs, which is particularly important for individuals experiencing asthma or allergic reactions.

In contrast, the other listed drugs have more narrow mechanisms of action. Fluticasone is an inhaled corticosteroid that primarily reduces inflammation without direct adrenergic effects. Ipratropium bromide is an anticholinergic that acts mainly on muscarinic receptors, and Formoterol is a long-acting beta2 agonist that specifically targets beta2 receptors but does not act on the alpha receptors. Therefore, the unique ability of epinephrine to stimulate all three types of receptors makes it the correct choice