Which route is described as being absorbed through the lungs when the medication is inhaled?

Which route is described as being absorbed through the lungs when the medication is inhaled?

• A. Inhalation
• B. Sublingual
• C. Intranasal
• D. Oral administration

Answer: (A)

Absorption through the lungs is the inhalation route. When a drug is inhaled, it reaches the alveoli in the lungs and diffuses across the alveolar epithelium into the pulmonary capillaries, allowing rapid entry into the bloodstream or local action in the airways. This contrasts with sublingual absorption under the tongue, intranasal absorption through the nasal mucosa, and oral administration that must pass through the digestive system. The inhalation route benefits from a very large surface area and rich blood supply, contributing to fast onset for systemic absorption or strong local effects in the lungs.

Absorption through the lungs is the inhalation route. When a drug is inhaled, it reaches the alveoli in the lungs and diffuses across the alveolar epithelium into the pulmonary capillaries, allowing rapid entry into the bloodstream or local action in the airways. This contrasts with sublingual absorption under the tongue, intranasal absorption through the nasal mucosa, and oral administration that must pass through the digestive system. The inhalation route benefits from a very large surface area and rich blood supply, contributing to fast onset for systemic absorption or strong local effects in the lungs.