What is Allergy 24-Hr: Uses, Warnings & Interactions

Updated May 14, 2025  •  Published Dec 30, 2020

Allergy 24-Hr overview

BRAND NAMES:

  • WAL-FEX ALLERGY, Allegra, Allegra Allergy, Allergy 24Hr, Allergy Relief, Children's Allegra Allergy, Children's Allergy Fexofenadine HCl, Good Neighbor Pharmacy Allergy, Good Neighbor Pharmacy Allergy Relief, Good Sense Aller-Ease, Leader 24HR Allergy Relief, Leader Aller-Ease, TopCare 24-Hour Fexofenadine Hydrochloride, Wal-Fex, WAL-FEX ALLERGY

Generic Names:

  • Fexofenadine Hcl

Uses:

  • Treats hay fever symptoms and chronic skin hives and itching.

Therapeutic Classes:

  • Respiratory Agent

Forms:

  • Capsule, Liquid, Tablet, Dissolving Tablet, Long Acting Tablet

How it’s taken:

  • By mouth

What is Allergy 24-Hr used for?

What form(s) does Allergy 24-Hr come in

  • Capsule

  • Liquid

  • Tablet

  • Dissolving Tablet

  • Long Acting Tablet

What are common Allergy 24-Hr doses?

  • Box 5 Tablets

  • Box 15 Tablets

  • Bottle 30 Tablets

  • Bottle 90 Tablets

How to take Allergy 24-Hr

  • Your doctor will tell you how much medicine to use. Do not use more than directed.

  • It is best to take the tablet with water.

  • Shake the oral liquid well before using. Measure the oral liquid medicine with a marked measuring spoon, oral syringe, or medicine cup.

  • Take the oral disintegrating tablet on an empty stomach.

  • Make sure your hands are dry before you handle the disintegrating tablet. Peel back the foil from the blister pack, then remove the tablet. Do not push the tablet through the foil. Place the tablet in your mouth. After it has melted, swallow or take a drink of water. Do not chew or break the tablet.

  • Missed dose: Take a dose as soon as you remember. If it is almost time for your next dose, wait until then and take a regular dose. Do not take extra medicine to make up for a missed dose.

  • Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light.

  • Make sure your hands are dry before you handle the disintegrating tablet. Peel back the foil from the blister pack, then remove the tablet. Do not push the tablet through the foil. Place the tablet in your mouth. After it has melted, swallow or take a drink of water. Do not chew or break the tablet.

  • It is best to take the tablet with water.

  • Missed dose: Take a dose as soon as you remember. If it is almost time for your next dose, wait until then and take a regular dose. Do not take extra medicine to make up for a missed dose.

  • Shake the oral liquid well before using. Measure the oral liquid medicine with a marked measuring spoon, oral syringe, or medicine cup.

  • Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light.

  • Take the oral disintegrating tablet on an empty stomach.

  • Your doctor will tell you how much medicine to use. Do not use more than directed.

What to do if you miss a dose of Allergy 24-Hr

Allergy 24-Hr contraindications

  • This medicine is not right for everyone. Do not use it if you had an allergic reaction to fexofenadine or terfenadine.

Allergy 24-Hr warnings

  • Call your doctor if your symptoms do not improve or if they get worse.

  • Keep all medicine out of the reach of children. Never share your medicine with anyone.

  • Tell your doctor if you are pregnant or breastfeeding, or if you have kidney disease or a condition called phenylketonuria (PKU).

  • This medicine may make you dizzy or drowsy. Do not drive or doing anything else that could be dangerous until you know how this medicine affects you.

Allergy 24-Hr interactions

  • Some medicines and foods can affect how fexofenadine works. Tell your doctor if you are also using any of the following: ErythromycinKetoconazole

  • If you use an antacid that contains aluminum or magnesium, take it at least 15 minutes before or after you take fexofenadine.

  • Do not eat grapefruit or drink grapefruit, orange, or apple juice while you are using this medicine.

  • Keep all medicine out of the reach of children. Never share your medicine with anyone.

Allergy 24-Hr side effects

Serious Side Effects

  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing

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