6 doctors weighed in:

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

6 doctors weighed in
Dr. Alex Martinez
Internal Medicine - Allergy
4 doctors agree

In brief: 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.

In brief: 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.
Dr. Alex Martinez
Dr. Alex Martinez
Thank
Dr. Maziar Rezvani
Internal Medicine - Allergy & Immunology
1 doctor agrees

In brief: 8x5=40 hours

The half life of Loratadine is 8 hours.
Usually it takes 5-6 half lives to be fully metabolized and "cleared" from your body so that is 40-48 hours.

In brief: 8x5=40 hours

The half life of Loratadine is 8 hours.
Usually it takes 5-6 half lives to be fully metabolized and "cleared" from your body so that is 40-48 hours.
Dr. Maziar Rezvani
Dr. Maziar Rezvani
Thank
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