How Long After Taking Zyrtec Can I Take Claritin (And Why)?

How Long After Taking Zyrtec Can I Take Claritin (And Why)?

Exact Answer: After 24 hours

Allergies are common and develop in any person when their immune system reacts excessively to substances that are harmless. When you’re detected to a substance you’re allergic to (such as dirt, smoke, pet dander, dust, peanuts, ragweed, etc), your body develops ‘histamine’, which is a chemical courier discharged by cells in the immune system to warn and activate other cells of the immune system. After that, it develops to recognize and know the allergen(that causes allergies). As it does so, it begins giving rise to antibodies to attack it when exposure happens.

Histamine results in the common allergy signs of sneezing, itchy eyes, runny nose, and an itchy throat that you relate with frontage to whichever allergens you are susceptible to. Therefore, Antihistamines were introduced to decrease the quantity of histamine circulating in your system, thereby reducing symptoms and relieving your body. Such Antihistamines include Claritin and Zyrtec. Both are regarded as newer-generation antihistamines. Other antihistamines are there too such as Atarax and Benadryl, regarded as first-generation antihistamines and very useful for allergies. But these are used in a limited manner due to their side effects such as tiredness and fatigue.

How Long After Taking Zyrtec Can I Take Claritin

How Long After Taking Zyrtec Can I Take Claritin?

Time gap between Zyrtec and  Claritin24 hours 
Zyrtec is preferred for Above 6 years of age 
Claritin is preferred forAbove 2 years of age

Claritin and Zyrtec are newer-generation antihistamines that can treat hives and allergies. There may be some advantages as it does not have many side effects in comparison to other antihistamines. Claritin is long-acting and working. People experience at least 24 hours of relaxation after a dose. Whereas, Zyrtec is fast-acting and works quickly. People who consume it may feel at ease in less than one hour. So, both of the drugs act equally but differ in relief duration.

If you want to take Claritin after taking Zyrtec, you should consult a doctor before taking it. While you should ask your doctor about the best means to take any drug, there are broadly accepted dosing suggestions for both of the antihistamines. The first and the main thing about these antihistamines is that each functions best when taken every day rather than intermittently. With a proper prescription, you can take it after 24 hours as Claritin takes that much duration to give sufficient relief.

Apart from that, Antihistamines like Zyrtec and Claritin are developed to relieve and calm the histamine consequence your body has when it’s exposed to an allergen. When your body experiences something it’s allergic to, it gives out white blood cells and goes into fight mode. These drugs are developed to prevent the reactions of the histamine that your body creates. Both the antihistamines come in similar forms like Solid tablets, Syrups, Capsules, Oral solutions, Dissolving tablets, and Chewable pills.


The prescribed doses rely on your age and the stringency of your indications and signs. Claritin is effective in the body for at least 24 hours. The normal daily dose of Claritin for grown-ups as well as kids who are 6 years and more is 10 mg per day. And for Zyrtec, it’s 5 mg or 10 mg. The normal daily dose of Claritin for kids aged 2–5 years is 5 mg.

Why Can I Take Claritin So Long After Taking Zyrtec?

Both Zyrtec and Claritin are beneficial over-the-counter allergy mitigation drugs. If your option has brought you down to these two medicines, you may ask yourself, will tiredness and sleepiness affect your day-to-day routine? If the opinions to this question don’t give rise to an answer, consult your doctor or druggist for a suggestion. If you find that the suggested medicine works nicely, stick with it and if it doesn’t, then attempt the other. If none of the options appear to help, meet an allergist. You may require a different course of therapy for your allergies.

In case you find, after taking Zyrtec it does not make you feel better then go for another one. Claritin gives relief after 24 hours and it’s effective too. As we know every drug has side effects so we can’t ignore that part. In comparison to others, Claritin and Zyrtec have very few side effects so they can be taken without any fear with a proper prescription.

But still, some side effects may happen. So, due to some rare side effects, it takes some time to take one after another as prescribed. Claritin barely causes sleepiness than Zyrtec when you take either at prescribed doses. Zyrtec can result in drowsiness, but only in some people. Take it for the first time when you will be at home for a few hours in case it makes you sleepy. 


Some rare and mild side effects resulting from both drugs include feeling drowsy or tired, headache, dizziness, sore throat, dry mouth, eye redness, stomach pain, diarrhea, and constipation. So, due to these rare side effects, you must avoid taking both at the same time. It takes barely 24 hours to take another antihistamine after the other.


Both Zyrtec and Claritin may make you sleepy or tired. That’s why, you shouldn’t take these drugs if you also take energy pills, muscle relaxers, sleeping pills, or others that cause sleepiness. Any medicine you consume must be under the supervision, or advice of your doctor. 

Consuming them at the same moment can make you very sleepy. Do not take either of these medications with alcohol. Alcohol may increase side effects and consequences which will make you dangerously drowsy. It’s better to take the proper advice of a druggist after taking any allergy relief drugs.



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  1. I appreciate the advice to consult a doctor before transitioning between Zyrtec and Claritin. It’s always best to get professional guidance when it comes to medications and allergies.

    1. Yes, I agree. It’s wise to consult with a healthcare professional before making any adjustments to allergy treatments. The article reinforces the importance of this.

    2. Absolutely, seeking medical advice is crucial when considering any changes to allergy medications. Safety should always be the top priority.

  2. The article provides a good breakdown of the prescribed doses for Claritin and Zyrtec based on age and severity of symptoms. This is important information for those needing to determine the right dosage for themselves or their children.

    1. Absolutely, having clear guidelines around dosage is crucial, especially when it comes to over-the-counter medications. It’s great that the article outlines this.

  3. This is a really informative article! I didn’t know that Claritin and Zyrtec are usually taken daily instead of intermittently. This is valuable information for people experiencing allergies.

    1. Yes, I found this article really informative too. It’s always good to have a better understanding of how these medications work.

  4. I wasn’t aware of the difference in relief duration between Claritin and Zyrtec. It’s interesting to know that Claritin lasts for 24 hours while Zyrtec is fast-acting and provides relief in less than one hour.

    1. Yes, the relief duration information is certainly useful for anyone considering between these two medications. It’s great to have this knowledge.

  5. The article provides comprehensive information about how histamine works and how antihistamines like Claritin and Zyrtec function to mitigate its effects. It’s great to have a clearer understanding of the science behind allergy relief.

  6. The article could have provided more detail on the potential rare side effects of Claritin and Zyrtec. While they’re generally safe, it’s important to be aware of all potential risks.

    1. I agree, it’s always important to have a complete view of the potential side effects of any medication. Having that information readily available is crucial for informed decision-making.

  7. The article could have included more information about potential side effects of Claritin and Zyrtec. It’s important for people to be aware of all possible effects when taking any medications.

    1. I agree, it would have been helpful to have more detailed information about potential side effects. It’s important for people to make informed decisions about their health.

  8. The article emphasizes the importance of trying different medications if one doesn’t provide relief. It’s a helpful reminder that not all medications work the same for everyone.

    1. Absolutely, it’s important for individuals to know that there are options and that it may take some trial and error to find the right allergy medication for them.

    2. Yes, understanding that there are alternatives and that consulting a healthcare professional is important is key. This article does a good job of conveying that message.

  9. So, it sounds like there isn’t a specific time frame between taking Zyrtec and Claritin, but that it’s recommended to wait 24 hours after one before taking the other. Is that right?

    1. Yes, that’s what I gathered from the article too. It’s helpful to have that guidance when considering how to transition between medications.

    2. That’s how I understood it as well. Thanks for clarifying that point. It’s definitely important to understand the timing between medications.

  10. The article provides a clear comparison between Claritin and Zyrtec, outlining differences in relief duration and recommended ages for use. This information is valuable for anyone considering these medications.

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