Claritin Interactions

When Claritin is taken with drugs such as cimetidine, ketoconazole, or erythromycin, interactions could occur. These interactions may affect the level of Claritin in your blood; however, studies indicate that most people will not have any problems as a result. Because there may be interactions with Claritin that are not known at this time, tell your healthcare provider about all medicines you currently take before taking Claritin.

Claritin Interactions: An Overview

Claritin® (loratadine) can potentially interact with a few other medications. Some of the medicines that may lead to Claritin drug interactions include:
 

More Information on Drug Interactions With Claritin

The following sections explain in detail the potentially negative interactions that can occur when Claritin is combined with any of the drugs listed above.
 
 
Cimetidine
Cimetidine may increase the level of Claritin in the blood, although studies suggest that this interaction is unlikely to cause any problems. However, you may want to consult with your healthcare provider, especially if you notice any increase in side effects of Claritin.
 
Erythromycin
Taking Claritin with erythromycin may change the way your body handles Claritin, possibly increasing the level of Claritin in your blood. However, this interaction seems unlikely to cause problems for most people.
 
Ketoconazole
Combining Nizoral with Claritin may increase the level of Claritin in your blood, although studies have not shown this to be a problem for most people.
 

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Written by/reviewed by: Kristi Monson, PharmD; Arthur Schoenstadt, MD
Last reviewed by: Kristi Monson, PharmD;
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