What classification is pseudoephedrine known under?

Pseudoephedrine is classified as a decongestant. It works by narrowing the blood vessels in the nasal passages, leading to decreased swelling and congestion. This makes it effective in relieving nasal or sinus congestion caused by colds, allergies, or hay fever.

Expectorants, which are substances that help to loosen and expel mucus from the respiratory tract, are not the correct classification for pseudoephedrine. Antihistamines are designed to block the action of histamine and reduce allergy symptoms, while analgesics are used to relieve pain. Therefore, understanding the specific mechanism and use of pseudoephedrine clarifies why it fits into the decongestant category.