allegra 120mg tablet

4.8 (4 reviews)

Fexofenadine (120mg)

🏭 Sanofi India Ltd 📦 Varies by brand 💊 Allopathy 📅 Updated: Aug 21, 2026

🤰 Pregnancy Category C 📋 Prescription Required 💊 Generic Available

Medically Reviewed

SaathiMed Expert Panel | Aug 21, 2026

What is allegra 120mg tablet used for?

allegra 120mg tablet (Fexofenadine (120mg)) is used to treat RESPIRATORY. It contains Fexofenadine (120mg), which Fexofenadine is a selective peripheral H1-receptor antagonist. It blocks histami. Always consult your doctor before use. Take as prescribed.

Generic Name: Fexofenadine (120mg)
Manufacturer: Sanofi India Ltd
Form: Allopathy
Pregnancy Category: C
Prescription Required: Yes

💡 Did You Know? The first generic medicine was introduced in India in 1970 after the Patents Act was amended.

💊 allegra 120mg tablet Uses & Benefits

Seasonal allergic rhinitis, chronic idiopathic urticaria.

📋 Drug Information

Generic Name(s)	Fexofenadine (120mg)
Brand Name	allegra 120mg tablet
Manufacturer	Sanofi India Ltd
Packaging / Form	Varies by brand (Allopathy)
Therapeutic Class	RESPIRATORY
Action Class	H1 Antihistaminics (second Generation)
Route of Administration	Oral
Storage	Store at 20-25°C (68-77°F); protect from moisture and light.
Shelf Life	As per manufacturer

🔬 Pharmacology (PK/PD)

Pharmacokinetics

AbsorptionRapidly absorbed after oral administration; peak plasma concentration achieved in 1-3 hours.

DistributionDistributed throughout the body; does not cross the blood-brain barrier significantly.

Protein Binding60-70% bound to plasma proteins (primarily albumin and alpha1-acid glycoprotein).

MetabolismMinimally metabolized; approximately 5% undergoes hepatic metabolism via CYP3A4.

Half-LifeApproximately 14.4 hours.

ExcretionPrimarily excreted unchanged in feces (80%) and urine (11%).

BioavailabilityApproximately 30-40%.

Onset of ActionWithin 1 hour.

Peak Plasma Time1-3 hours.

Duration of ActionUp to 24 hours.

How It Works

Fexofenadine is a selective peripheral H1-receptor antagonist. It blocks histamine from binding to H1 receptors, thereby reducing allergic symptoms.

Mechanism Steps

1Fexofenadine binds to H1 receptors on effector cells (e.g., smooth muscle, endothelial cells).

2Blocks histamine from binding and activating the receptor.

3Prevents downstream signaling (e.g., vasodilation, increased vascular permeability, smooth muscle contraction).

💡 How to Take allegra 120mg tablet

Follow your doctor's prescription exactly.

⚠️ Side Effects of allegra 120mg tablet

✅ Common Side Effects

Headache
Drowsiness
Dizziness
Nausea
Dry mouth

🚨 Serious Side Effects

Hypersensitivity reactions (e.g., angioedema, anaphylaxis)
Severe skin reactions (e.g., Stevens-Johnson syndrome)

⚠️ Rare Side Effects

Tachycardia
Palpitations
Hepatitis
Thrombocytopenia

Consult your doctor if you experience any unusual symptoms.

🔬 Drug Interactions

⚠️ Drug	Severity	Effect
Erythromycin	Major	Increased fexofenadine plasma levels
Ketoconazole	Major	Increased fexofenadine plasma levels
Rifampin	Moderate	Decreased fexofenadine efficacy
Antacids	Moderate	Reduced absorption of fexofenadine
Grapefruit juice	Minor	Slight decrease in fexofenadine absorption

🚨 Major Interactions

Erythromycin
Ketoconazole
Itraconazole

⚡ Moderate Interactions

Rifampin
St. John's Wort
Antacids containing aluminum or magnesium

ℹ️ Minor Interactions

Grapefruit juice

🍽️ Food Interactions

Food may slightly decrease the rate and extent of absorption; but no significant clinical effect.

🍷 Alcohol Interaction

No significant interaction; however, alcohol may worsen drowsiness in some individuals.

🛡️ Safety & Warnings

🚫 Contraindications

Hypersensitivity to fexofenadine or any component of the formulation.

🤱 Lactation Safety

Fexofenadine is excreted in breast milk in small amounts; caution advised.

💊 Overdose Management

Symptoms may include dizziness, drowsiness, and dry mouth. Treatment is supportive; no specific antidote.

⏰ Missed Dose

Take as soon as remembered unless it is near the time of the next dose; do not double dose.

👨‍⚕️ Reviewed by Expert

SaathiMed Expert Panel

MD, PhD - Pharmacology

Last reviewed on: Aug 21, 2026

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🔄 Substitutes for allegra 120mg tablet

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Alternative brands with exact same active ingredient (Fexofenadine (120mg)):

Medical Note: Always consult your doctor before switching medications.

⭐ User Reviews

Happy Patient Jul 10, 2026

Good quality medicine. Satisfied with the outcome.

Regular Customer Jul 10, 2026

Found this to be a helpful product. Good results.

Certified Buyer Jul 10, 2026

Helpful and effective medicine as per my experience. Always consult a doctor.