Allergies Home > Clarinex Precautions and Warnings

Clarinex precautions and warnings typically apply to people who are allergic to Clarinex or to its inactive ingredients, as well as people with serious medical conditions. Before taking the drug, tell your doctor about all medicines you take, any allergies you have, and medical conditions such as liver disease or phenylketonuria. This way, your doctor can better determine which Clarinex precautions and warnings apply to you.

What Should I Tell My Healthcare Provider?

You should talk with your healthcare provider prior to taking Clarinex® (desloratadine) if you have:
  • Kidney disease
  • Liver disease
  • Phenylketonuria (if taking the RediTabs®).
Let your healthcare provider know if you:
  • Are pregnant or are thinking about becoming pregnant
  • Are breastfeeding
  • Have any allergies, including allergies to Clarinex or Claritin®.
Also, tell your healthcare provider about all the medicines you take, including prescription and non-prescription medicines, vitamins, and herbal supplements.
Finally, make sure to contact your healthcare provider or 911 immediately if you experience any difficulty breathing or swallowing.

Some Clarinex Precautions and Warnings

Clarinex precautions and warnings that you should be aware of include:
  • Certain medications can cause unwanted interactions with Clarinex (see Clarinex Drug Interactions).
  • Although Clarinex causes drowsiness less often than other antihistamines, it still can make some people tired. Therefore, until you know whether Clarinex makes you tired, caution should be used before driving a car or operating potentially dangerous machinery.
  • Clarinex is a pregnancy Category C medicine, meaning that it could potentially harm your unborn child. If you are pregnant, you should take Clarinex only if your healthcare provider believes that its benefits outweigh the possible risks. Discuss this with your healthcare provider before using Clarinex.
  • If you are nursing or plan to nurse, Clarinex passes through your milk. Therefore, if you are taking Clarinex, you are recommended to stop nursing until talking with your healthcare provider.
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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