Which method applies a drug through the respiratory tract for systemic or local effect?

Which method applies a drug through the respiratory tract for systemic or local effect?

• A. Oral
• B. Topical methods
• C. Inhalation/Nasal methods
• D. Rectal

Answer: (C)

Delivering a drug through the respiratory tract is done by inhalation or nasal administration. This route delivers the medication directly to the airways or absorbed across the nasal mucosa, providing either a local effect in the respiratory system or a systemic effect when the drug enters the bloodstream through the alveolar or nasal tissues. It bypasses the gastrointestinal tract and first-pass metabolism, often allowing a rapid onset. This is the best choice because it specifically uses the respiratory tract for delivery. Other routes—oral, rectal, and topical—do not utilize the lungs or nasal passages for administration. Oral goes through the digestive system, rectal is through the rectum, and topical methods typically refer to skin or mucous membranes outside the respiratory tract, not the inhaled/nasal pathway.

Delivering a drug through the respiratory tract is done by inhalation or nasal administration. This route delivers the medication directly to the airways or absorbed across the nasal mucosa, providing either a local effect in the respiratory system or a systemic effect when the drug enters the bloodstream through the alveolar or nasal tissues. It bypasses the gastrointestinal tract and first-pass metabolism, often allowing a rapid onset.

This is the best choice because it specifically uses the respiratory tract for delivery. Other routes—oral, rectal, and topical—do not utilize the lungs or nasal passages for administration. Oral goes through the digestive system, rectal is through the rectum, and topical methods typically refer to skin or mucous membranes outside the respiratory tract, not the inhaled/nasal pathway.