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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Constant Fatigue After Discontinuing Zyrtec?

I normally take Zyrtec daily for my allergies, however, I ran out of it (I live overseas) and so started taking Claritin 10mg which I also have at home. Since I ve been taking the Claritin, I ve been experiencing constant fatigue and I feel tired all the time. Are my symptoms the side effect of the Claritin? I know that definitely Benadryl can produce those symptoms. Thank you,
Tue, 18 Dec 2018
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General & Family Physician,  's  Response
Hello,

Claritin is in one class with Zyrtec and has less side effects and causes less fatigue compared to benadryl but still it does have a chance to cause this so it might be that the fatigue is related to Claritin use. Taking it at night reduces this effect and should help you feel better during the night.

On the other hand if the fatigue is there for longer then 3 weeks then you will need to have a visit with your doctor to rule out other possible causes of fatigue.

I hope I have answered to your query. Let me know if I can assist you further.

Take care

Regards,
Antoneta Zotaj, General & Family Physician
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What Causes Constant Fatigue After Discontinuing Zyrtec?

Hello, Claritin is in one class with Zyrtec and has less side effects and causes less fatigue compared to benadryl but still it does have a chance to cause this so it might be that the fatigue is related to Claritin use. Taking it at night reduces this effect and should help you feel better during the night. On the other hand if the fatigue is there for longer then 3 weeks then you will need to have a visit with your doctor to rule out other possible causes of fatigue. I hope I have answered to your query. Let me know if I can assist you further. Take care Regards, Antoneta Zotaj, General & Family Physician