Active Ingredient

Desloratadine

Desloratadine is an antihistamine used to relieve allergy symptoms. It helps reduce symptoms such as sneezing, runny nose, and itchy eyes.

This medication is often used by individuals who suffer from seasonal allergies or chronic allergic conditions.

Written By Douglas C. Goldberg, MD

Reviewed By Philip Schein, MD

Last Updated 28 Nov 2025

Available Desloratadine Brands

Clarinex

Strengths 5mg

Desloratadine Uses

Desloratadine is commonly used to treat symptoms associated with allergic reactions.

Allergic rhinitis (hay fever)
Chronic idiopathic urticaria (hives)
Nasal congestion
Itchy or watery eyes
Runny nose

How Desloratadine Works

Desloratadine works by blocking histamine, a substance in the body that causes allergic symptoms. It belongs to a class of drugs known as antihistamines.

By preventing histamine from binding to its receptors, Desloratadine helps reduce symptoms like sneezing and itching.

It is non-sedating, meaning it typically does not cause drowsiness.

Common side effects of Desloratadine

Not everyone experiences side effects from Desloratadine, and many are mild and temporary.

Headache
Fatigue
Dry mouth
Drowsiness
Sore throat
Muscle pain
Nausea

If you experience serious or persistent symptoms, contact your doctor.

Avoid consuming alcohol while taking Desloratadine, as it can enhance drowsiness.
Monitor your symptoms and consult a doctor if they worsen.
Inform your healthcare provider about any other medications you are taking to prevent interactions.
Do not drive or operate heavy machinery if you feel drowsy after taking this medication.
Seek immediate medical attention if you experience any severe allergic reactions.

Always consult a doctor for personalized medical advice.

Frequently Asked Questions

How long does it take for Desloratadine to work?

Desloratadine usually starts to work within a few hours. However, the full effect may take longer for some individuals.

Can I take Desloratadine with other medications?

It’s important to consult your doctor before combining Desloratadine with other medications to avoid possible interactions.

Is Desloratadine safe for long-term use?

Desloratadine is generally considered safe for long-term use when taken as directed by a healthcare professional.

Does Desloratadine cause drowsiness?

Desloratadine is a non-sedating antihistamine, meaning it typically does not cause drowsiness. However, some individuals may still experience this side effect.

What should I do if I miss a dose of Desloratadine?

If you miss a dose, take it as soon as you remember unless it’s almost time for your next dose. Do not double up to make up for a missed dose.