What is Clarinex-D 12 Hour? Uses, warnings & side effects

What is Clarinex-D 12 Hour? Uses, warnings & side effects

Updated May 14, 2025 • Published Dec 30, 2020

Check our best Clarinex-D 12 Hour prices

Clarinex-D 12 Hour overview

BRAND NAMES:

Clarinex-D, CLARINEX-D 12 HOUR, Clarinex-D 24HR

Generic Names:

Clarinex-D 12 Hour

Uses:

Treats symptoms of seasonal allergies. This medicine contains an antihistamine and a decongestant.

Therapeutic Classes:

Antihistamine, Less-Sedating/Decongestant Combination

Forms:

24 Hour Tablet, 12 Hour Tablet

How it’s taken:

By mouth

What is Clarinex-D 12 Hour used for?

What form(s) does Clarinex-D 12 Hour come in?

24 Hour Tablet
12 Hour Tablet

What are common Clarinex-D 12 Hour dosages?

Tablet 2.5mg/120mg

Clarinex-D 12 Hour images - What does Clarinex-D 12 Hour look like?

Clarinex-D 12 Hour
2.5mg/120mg tablet
Clarinex-D 12 Hour
2.5-120mg tablet extended release 12 hour

How to take Clarinex-D 12 Hour

Your doctor will tell you how much medicine to use. Do not use more than directed.
Swallow the extended-release tablet whole. Do not crush, break, or chew it.
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.
Swallow the extended-release tablet whole. Do not crush, break, or chew it.
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.
Your doctor will tell you how much medicine to use. Do not use more than directed.
Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light.

What to do if you miss a dose of Clarinex-D 12 Hour

Clarinex-D 12 Hour contraindications - Who shouldn't take Clarinex-D 12 Hour?

This medicine is not right for everyone. Do not use it if you had an allergic reaction to desloratadine, pseudoephedrine, or loratadine, or if you have narrow-angle glaucoma, severe heart disease, severe high blood pressure, or problems urinating.

Clarinex-D 12 Hour warnings

Tell your doctor if you are pregnant or breastfeeding, or if you have kidney disease, liver disease, diabetes, high blood pressure, heart disease, glaucoma, thyroid problems, or prostate problems.
Keep all medicine out of the reach of children. Never share your medicine with anyone.
Lightheadedness, dizziness, fainting
Severe nervousness or restlessness, tremors, seizures

Clarinex-D 12 Hour interactions & what to avoid when taking Clarinex-D 12 Hour

Some medicines can affect how this medicine works. Tell your doctor if you are also using any of the following: DigitalisReserpineMedicine to lower blood pressure
Do not use other antihistamine or decongestant medicines with this medicine, including ones you can buy without a prescription.
Do not use this medicine if you have used an MAO inhibitor in the past 14 days.

Clarinex-D 12 Hour side effects - How does Clarinex-D 12 Hour make you feel?

Serious Side Effects

Severe nervousness or restlessness, tremors, seizures
Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing
Fast, pounding, or uneven heartbeat
Lightheadedness, dizziness, fainting

Less Serious Side Effects

Headache
Trouble sleeping
Dry mouth