What are the most common routes of medication administration?

• A. Inhalation and Subcutaneous
• B. Intravenous and Intramuscular
• C. Rectal and Vaginal
• D. Oral and Topical

Answer: (D)

The most common ways people receive medications are by mouth and by applying them to the skin or mucous membranes. Oral medications—like tablets, capsules, and liquids—are favored because they’re easy for patients to take themselves, noninvasive, cost-effective, and versatile for many drugs. The body absorbs these drugs through the digestive system, allowing systemic effects for a wide range of conditions.

Topical medications—such as creams, ointments, gels, and patches—are widely used because they’re easy to apply and can deliver local treatment directly to a skin area or provide controlled systemic delivery with patches. This route minimizes overall body exposure and is especially handy for skin conditions or localized pain, while patches can offer steady systemic dosing without frequent dosing.

Other routes like intravenous, intramuscular, inhalation, rectal, or vaginal exist and are important in particular situations—rapid onset, when a patient can’t swallow, or when a medicine is best absorbed through the lungs or mucous membranes—but they’re not as broadly applicable or as convenient for everyday use as oral and topical routes.