Question 62

Loratadine is an antihistamine.

Loratadine functions as an antihistamine, which means it is primarily used to relieve allergy symptoms by blocking the action of histamine, a substance in the body that causes allergic reactions.

A) decongestant

A decongestant is a type of medication that relieves nasal congestion by narrowing blood vessels in the nasal passages. Loratadine does not have this effect; rather, it specifically targets histamine receptors to alleviate allergy symptoms.

B) antihistamine

As an antihistamine, Loratadine effectively prevents and alleviates symptoms associated with allergic reactions, such as sneezing, runny nose, and itchy eyes, by inhibiting the action of histamine in the body. This makes it the correct classification for Loratadine.

C) vasodilator

A vasodilator is a drug that relaxes blood vessels to increase blood flow. Loratadine does not exhibit vasodilatory properties, as its primary action is unrelated to blood vessel dilation or cardiovascular effects.

D) antidepressant

Antidepressants are medications designed to treat depression by influencing neurotransmitters in the brain. Loratadine does not function in this capacity and is not used to manage mood disorders, making this option incorrect.

Conclusion

Loratadine is definitively classified as an antihistamine, as its primary mechanism is to block histamine receptors and mitigate allergic responses. All other options, including decongestant, vasodilator, and antidepressant, describe different classes of medications and are not applicable to Loratadine’s pharmacological properties.