Allegra (Fexofenadine)
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Allegra, whose active ingredient is fexofenadine, is an antihistamine commonly used to relieve allergy symptoms. Here’s a comprehensive overview:
Uses
- Allergic Rhinitis: Allegra is effective in treating symptoms of seasonal allergies (hay fever), such as sneezing, runny or itchy nose, and itchy or watery eyes.
- Chronic Urticaria: It can also help relieve itching and hives associated with chronic urticaria.
Mechanism of Action
Fexofenadine is a selective peripheral H1 receptor antagonist. It works by blocking the action of histamine, a substance in the body that causes allergic symptoms.
Dosage
- Adults and Children (12 years and older): The typical dose is 60 mg twice daily or 180 mg once daily.
- Children (6 to 11 years): The recommended dose is usually 30 mg twice daily.
- Children under 6 years: Consult a healthcare provider for appropriate dosing.
Side Effects
Common side effects may include:
- Headache
- Drowsiness (less common than with older antihistamines)
- Nausea
- Dizziness
Serious side effects are rare but can include allergic reactions, such as rash, itching, or difficulty breathing.
Precautions
- Pregnancy and Nursing: Consult a healthcare provider before use.
- Kidney Function: Use with caution in patients with impaired kidney function.
- Other Medications: Inform your doctor about other medications you’re taking, as interactions can occur.
Administration
Allegra is typically taken orally, with or without food. It is important to follow dosing instructions and not exceed the recommended amount.
Availability
Allegra is available over the counter in various forms, including tablets, liquid, and orally disintegrating tablets.
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Allegra (fexofenadine) is a non-drowsy antihistamine used to relieve allergy symptoms like sneezing, runny nose, itchy/watery eyes, and hives (urticaria) by blocking histamine’s effects, offering relief from hay fever (seasonal allergic rhinitis) and skin itching, and is available over-the-counter or by prescription in various forms (tablets, dissolving tablets, liquid) for adults and children, but consult a doctor for proper use, especially with kidney issues or pregnancy.
How it works
- Blocks histamine: It’s a selective peripheral H₁ blocker, meaning it stops histamine, a chemical your body releases during an allergic reaction, from causing symptoms.
- Reduces drowsiness: Because it doesn’t cross into the central nervous system as much as older antihistamines, it’s less likely to make you sleepy.
Uses
- Allergic Rhinitis: Hay fever, sneezing, runny nose, itchy/watery eyes.
- Chronic Idiopathic Urticaria: Itchy skin hives.
Common Side Effects
- Headache, dizziness, nausea, diarrhea, vomiting.
Important Considerations
- Dosage: Varies by product (e.g., 12-hour or 24-hour), but generally taken with water, often on an empty stomach (check specific product instructions).
- Forms: Available as tablets, dissolving tablets, and liquid.
- Pregnancy: Generally considered safe in pregnancy, with studies showing no increased risk for miscarriage or birth defects, but always check with a healthcare provider.
- Caution: Avoid giving to children under 4, and consult a doctor for kidney issues or long-term use.
- Fruit Juice: Avoid drinking fruit juices (like orange, grapefruit, apple) with Allegra as they can reduce its effectiveness.
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