How is epinephrine typically administered?

• A. Subcutaneous
• B. Intravenous
• C. Oral
• D. Intramuscular

Answer: (D)

Epinephrine is given intramuscularly because this route provides rapid and reliable absorption in emergencies. Injecting into the muscle—typically the outer thigh—places the drug into well‑perfused tissue, so it enters the bloodstream quickly and starts acting within minutes. This makes the intramuscular route the preferred first‑line method, and it’s the form used in auto‑injectors carried for anaphylaxis.

Subcutaneous injection can be slower and more variable, especially when circulation is compromised during a severe reaction, making it less dependable. Intravenous administration delivers the drug directly into the bloodstream and is reserved for controlled hospital settings with monitoring due to higher risk of rapid, powerful cardiovascular effects. Oral administration is ineffective for epinephrine because it is poorly absorbed and rapidly degraded in the gut.