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Doctor insights on: How Long Does Claritin Stay In Your System

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For how long does Claritin (loratadine) stay in your system?

For how long does Claritin (loratadine) stay in your system?

One day: Claritin (loratadine) 10 mg pill is dosed once daily. That's because it's effect will last about 24 hours, after that it's antihistamine effect wanes. However, Claritin is metabolized by the liver into another active compound called desloratadine, so the antihistamine effect can last a while. This is why most allergists have patients stop their Claritin a number of days before skin testing them. ...Read more

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Dr. Ashraf Abdel Azeem
506 doctors shared insights

Claritin (Definition)

Claritin is a non-sedating antihistamine which is a kind of antihistamine type drug (common ...Read more


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How long does Claritin (loratadine) d stay in your system?

How long does Claritin (loratadine) d stay in your system?

3-5 days: The average half-life of Claritin (loratadine) is 8 hours meaning that half the dose is gone/metabolized after 8 hours and after 8 more hours another half is gone. Doing the math, the Claritin (loratadine) is effectively out of a person's system in 3-5 days, except in geriatric patients it could possibly take up to 10 days. ...Read more

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How long Claritin (loratadine) stay in system?

Loratidine: The average half-life of loratidine (claritin) is about 8 hours. This means almost 90% of the drug is out of your system 24 hours after taking it (on average). ...Read more

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My 6mo old was prescribed loratadine/ambroxol. she seems very drowsy, why? and how long will it stay i her system?

My 6mo old was prescribed loratadine/ambroxol. she seems very drowsy, why? and how long will it stay i her system?

Mgt: If your baby is more drowsy/lethargic, not feeding well, please see your ED. This may not be related to the medications, but rather to an illness. The ambroxol should be discontinued until further evaluation is completed. For excessive mucus production, nasal saline drops and gentle suction is the only treatment advised in this age group, unless there is a tracheostomy or some other problem. ...Read more

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If i take zertec for a long period 10mo then switch to Claritin (loratadine) can my sinuses become dependent on zyrtec and over produce mucus w/o zyrtec in system?

If i take zertec for a long period 10mo then switch to Claritin (loratadine) can my sinuses become dependent on zyrtec and over produce mucus w/o zyrtec in system?

Unlikely: While the "good" effect of zyrtec (cetirizine) will be gone in several days, there is no known problem of "rebound" or worsening symptoms when stopping oral antihistamines. More likely, is the continued exposure to the allergens. Here is where an allergist will be able to assist. ...Read more