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General Health

Allegra 120: How Does It Provide Relief from Allergy?

By Apollo pharmacy, Published On- 04 June 2025

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If you’ve ever dealt with sneezing fits, a runny nose, watery eyes, or constant itching during seasonal changes, you know how frustrating allergies can be. Every year, many people suffer from allergic rhinitis and similar allergic reactions. Among the many antihistamines available, Allegra 120 stands out for its fast-acting, non-drowsy formula, making it a popular choice for allergy relief. But how exactly does Allegra 120 work, and is it suitable for you? In this blog, we’ll dive into the common causes of allergies and explain how Allegra 120 helps by blocking histamine, the chemical responsible for allergy symptoms. We’ll also cover the benefits of this medication, how to use it correctly, and key precautions to keep in mind. Whether you experience seasonal allergies or year-round symptoms, understanding Allegra 120 can help you manage your allergies effectively and comfortably.

What Are Allergies?

Allergies are hypersensitive immune responses to substances that are normally harmless to most people. These substances, called allergens, may include pollen, dust mites, pet dander, mould spores, insect stings, or certain foods. When an allergic person comes into contact with an allergen, their immune system overreacts, releasing chemicals like histamine which trigger inflammation and unpleasant symptoms.
Common Allergy Symptoms Include:

  • Sneezing
  • Runny or blocked nose
  • Itchy or watery eyes
  • Skin rashes or hives
  • Swelling of the lips, eyes, or face
  • Itchy throat or ears

These symptoms, while non-life-threatening in most cases, can significantly interfere with your daily life, productivity, and sleep quality. This is where allergy medications like Allegra 120 come into play.

What Is Allegra 120?

Allegra 120 is a widely used over-the-counter antihistamine medication that contains fexofenadine hydrochloride as its active ingredient. It is primarily used to treat symptoms of seasonal allergic rhinitis (also known as hay fever) and chronic idiopathic urticaria (long-term hives of unknown cause). The "120" in Allegra 120 refers to the 120 mg dosage of fexofenadine hydrochloride in each tablet. Unlike older-generation antihistamines that can cause drowsiness, Allegra 120 is a non-sedating antihistamine, making it suitable for people who want to stay alert during the day while keeping their allergy symptoms under control.

How Does Allegra 120 Work?

When your body detects an allergen, it releases histamine, a chemical that causes inflammation and allergic symptoms. Histamine binds to H1-receptors in the body, triggering swelling, itching, and mucus production.

Fexofenadine, the key ingredient in Allegra 120, is an H1-receptor antagonist. This means it blocks histamine from binding to its receptors, thereby preventing or reducing the allergic response. As a result, symptoms like sneezing, watery eyes, nasal congestion, and itching subside effectively. Fexofenadine doesn’t easily enter the brain, so it doesn’t cause drowsiness and provides up to 24-hour relief. This makes Allegra 120 an effective, fast-acting choice for allergy relief.

Benefits of Allegra 120


Allegra 120 is popular among allergy sufferers for several reasons. Some of the benefits of Allegra 120 are as follows:

1. Non-Drowsy Formula

Unlike first-generation antihistamines like diphenhydramine, Allegra 120 does not typically cause drowsiness. This makes it ideal for daytime use, including for professionals, students, and drivers.

2. Fast-Acting Relief

Most people start experiencing relief within one to two hours of taking a tablet. This makes Allegra 120 suitable for managing sudden allergy flare-ups.

3. Long-Lasting Effects

Each tablet of Allegra 120 can provide relief for up to 24 hours, allowing you to take just one tablet per day for consistent protection.

4. Safe for Long-Term Use

When taken as directed, Allegra 120 is considered safe for extended use, especially in individuals with chronic allergy issues such as perennial rhinitis or urticaria.

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Conditions Treated by Allegra 120


Allegra 120 is effective for treating the following allergic conditions:

1. Seasonal Allergic Rhinitis (Hay Fever)

Symptoms occur during specific seasons due to pollen from grass, trees, or weeds. Allegra 120 helps alleviate the classic hay fever symptoms.

2. Perennial Allergic Rhinitis

This is caused by allergens present all year round such as dust mites, mould, and pet dander. Regular use of Allegra 120 helps manage daily symptoms.

3. Chronic Idiopathic Urticaria

This condition involves persistent hives and itching with no known cause. Allegra 120 helps in reducing the frequency and intensity of the itching and hives.

How to Use Allegra 120?

Taking Allegra 120 correctly is key to achieving the best results. Here are some guidelines:

  • Dosage: Usually it's one tablet once daily with water. Please consult with your healthcare provider before taking or changing dosage.
  • Timing: Best taken on an empty stomach, or at least 2 hours after a meal.
  • Consistency: Take the medicine at the same time each day to maintain stable levels in your body.
  • Do Not Crush or Chew: Swallow the tablet whole with water.

Always follow your doctor’s instructions or refer to the leaflet that comes with the medication.

Possible Side Effects

Although Allegra 120 is generally well-tolerated, some individuals may experience mild side effects, such as:

  • Headache
  • Dizziness
  • Nausea
  • Dry mouth
  • Fatigue

These side effects are usually temporary. However, if you experience more serious reactions such as rash, swelling of the face or throat, or difficulty breathing, seek immediate medical help.

Who Should Avoid Allegra 120?

Allegra 120 may not be suitable for everyone. You should consult a healthcare provider before using it if:

  • You are pregnant or breastfeeding
  • You have kidney or liver problems
  • You are taking antacids (as these can interfere with absorption)
  • You have a known allergy to fexofenadine

Additionally, do not take more than the recommended dose. Taking extra tablets will not speed up relief and may increase the risk of side effects.

Interactions to Keep in Mind

Certain medications or foods may interact with Allegra 120. Some points to consider include:

  • Avoid taking aluminium or magnesium-based antacids within two hours of Allegra.
  • Taking it with fruit juice (especially grapefruit or orange juice) can reduce the medicine's absorption. It's best taken with plain water.
  • Inform your doctor about any prescription or over-the-counter medicines, supplements, or herbal products you’re using.

Allegra 120 for Children

While Allegra is available in various strengths and forms (like oral suspension) for children, Allegra 120 tablets are typically recommended for adults and adolescents aged 12 and above. Always consult a paediatrician before giving any medication to a child.

Tips to Maximise Allergy Relief

Alongside taking Allegra 120, these simple preventive steps can help you manage allergies more effectively:

  • Keep windows closed on days when pollen levels are high.
  • Wash your hands and face after spending time outside.
  • Change bed linens weekly and vacuum carpets frequently to reduce allergens.
  • Avoid exposure to known allergy triggers whenever possible.

Conclusion

Allergies can be a persistent and disruptive part of daily life, but with the right treatment, they can be effectively managed. Allegra 120 offers fast-acting, long-lasting, and non-drowsy relief from symptoms like sneezing, itchy eyes, nasal congestion, and hives. With a single tablet a day, many people experience noticeable improvements in their comfort and quality of life. Whether you're dealing with seasonal hay fever or ongoing urticaria, Allegra 120 can be a valuable tool in your allergy management plan. Always read the label, follow dosage instructions, and consult your doctor if you have any concerns or experience ongoing symptoms. By understanding how Allegra 120 works and using it correctly, you can take proactive steps to reduce allergic reactions and enjoy your days, no matter the season.
 

General Health

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