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Doctor insights on: Cetirizine Dosage 20mg

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Will gradual increases in dosages of reactine (zyrtec) eventually cause rebound congestion? Thanks.

Will gradual increases in dosages of reactine (zyrtec) eventually cause rebound congestion? Thanks.

No : Rebound nasal congestion is most commonly seen with topical nasal decongestants such as oxymetazoline as found in afrin nasaly spray. Antihistamines are not associated with rebound symptoms including congestion. ...Read more

Dr. John Chiu
569 doctors shared insights

Cetirizine (Definition)

Ceftirizine is the generic name of an antihistamine previously marketed under the ...Read more


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What is the zyrtec (cetirizine) syrup dosage for a 21kg child & what is the max dosage per day. Thanks?

What is the zyrtec (cetirizine) syrup dosage for a 21kg child & what is the max dosage per day. Thanks?

By age: Dosing for zyrtec (cetirizine) is by age. If under 6, give one teaspoon, a maximum of 5mg a day, if more than 6, give 10mg or 2 teaspoons. ...Read more

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Are doses of cetirizine (reactine) 20mg bid too high for a period of 6 months. Could you link any studies about that dosage for long periods of time.

Are doses of cetirizine (reactine) 20mg bid too high for a period of 6 months. Could you link any studies about that dosage for long periods of time.

Ok: Anthistamine has a very high safety margin. In fact many of our patients with chronic hives have been taken cetirizine in the dose mentioned for years without any problem. The major side effects would be drowsiness and dry mouth. ...Read more

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What is the dosage for Childrens Liquid Zyrtec for 15 month old?

What is the dosage for Childrens Liquid Zyrtec for 15 month old?

What r u treating?: depends on the condition you are trying to treat, if an allergic reaction, yes you can give the zyrtec, but the labels won't tell how much to give if below 2-years old, you can give 2ml to help the reaction. but if you are trying to treat other conditions as runny nose or congestion, see your pediatrician, good luck ...Read more

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What dosage of OTC zyrtec (cetirizine) should a 12 year old child be on?

What dosage of OTC zyrtec (cetirizine) should a 12 year old child be on?

Lower than adult.: Depends on the size: less than 90lbs, go with 5mg. If larger, the 10mg dose should be fine. Recently I have seen some very large 12 year olds. ...Read more

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My 5 year old had his first hives attack 3 months ago. He cannot stop taking cetirizine on a daily dosage because hives come and go always?

My 5 year old had his first hives attack 3 months ago.  He cannot stop taking cetirizine on a daily dosage because hives come and go always?

Many Possibilities: Might to to have allergy tests to see if the cause can be identified. There may be other conditions causing hives such as hidden infection (sinuses or strep throat for example), anxiety, skin exposures and other diseases.See your pediatrician. ...Read more

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What drug can I give my 4 month daughter and cough? I have piriton, zyrtec (cetirizine) and allerief in the house. She weighs 7kg. Give dosage too

What drug can I give my 4 month daughter and cough? I have piriton, zyrtec (cetirizine) and allerief in the house. She weighs 7kg. Give dosage too

See doctor: It is not recommended to give infants and young children cough medicine as the cough is typically protective and the medications can be harmful. If the cough appears to be related to a cold and no difficulties breathing it should start to resolve in 7-10 days. If not getting better or not related to a cold she should be evaluated by her physician. ...Read more

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What is the recommended dosage for salbutamol neb and cetirizine fo 26wks pregnand that has a productive cough?

What is the recommended dosage for salbutamol neb and cetirizine fo 26wks pregnand that has a productive cough?

?: Productive cough, 26 weeks pregnant, you are asking about salbutamol nebs and cetirizine, salbutamol is category C and cetirizine is category B with pregnancy, those categories are degrees of safety given for a drug during pregnancy, given that, you need to see your doctor, or any doctor to prescribe the right medicine safe for yourself and your unborn child, goodluck ...Read more

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How much dosage of zyrtec can i have in a day? Im 78 years old.. Im having liquid food Ensure, for over a month,, Could this result in itching allergy

How much dosage of zyrtec can i have in a day? Im 78 years old.. Im having liquid food Ensure, for over a month,, Could this result in itching allergy

Possible: Ensure has ingredients (with dairy one of them) which can be allergenic. On the other hand, at your age, dry skin may be a more likely issue. Try unscented soap, apply moisturizer on your skin <3 mins after bathing and again in 12 hrs +/- bathing. Zyrtec would not help dry skin but you can take it up to 4 x daily if needed. For food allergy, avoidance is a must. ...Read more

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Why are the mg dosage of antihistamines different? Allegra is 180mg , Claritin (loratadine) is 5mg , and zyrtec is 10mg.

Why are the mg dosage of antihistamines different? Allegra is 180mg , Claritin (loratadine) is 5mg , and zyrtec is 10mg.

Potency: Although the doses are not equal they are equivalent in potency. That is the drugs will have equal efficacy at controlling congestion, runny nose etc. The doses are different because they are different compounds and those compounds are of different weight and size. ...Read more

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Can excessive dose of cetirizine may lead to death?

Can excessive dose of cetirizine may lead to death?

Too much cetirizine: Too much of any drug could be dangerous but Cetirizine is generally very safe in usual doses. It is not uncommon for allergists to prescribe Cetirizine in higher than recommended doses up to 40 mg per day. This does not mean it is completely safe since sedation is common at this dose. Over-the-counter medications should be used at the recommended doses unless supervised by a physician. ...Read more

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I took 10 mg. Zyrtec (cetirizine) about 7 hours ago and wonder if I can take a dose of NyQuil before going to bed.

YES: however the use of both products should not exceed the doses you are using and you may have increased sedation. ...Read more

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I have chronic hives that is flaring, medol helped but symptoms back after six day dose. Now 20mg zyrtec (cetirizine) suggested, seeing dif opinions of benefit?

I have chronic hives that is flaring, medol helped but symptoms back after six day dose.  Now 20mg zyrtec (cetirizine) suggested, seeing dif opinions of benefit?

Double antihistamine: Speak to your doctor about using 2 different antihistamines -one in am and one in pm. If that does not work see an allergist who can suggest other therapies. ...Read more

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Took 1/2 zyrtec (cetirizine) 5 hours ago. Is it safe to take 1/2 dose nyquil liquigels (1 capsule)?

Took 1/2 zyrtec (cetirizine) 5 hours ago. Is it safe to take 1/2 dose nyquil liquigels (1 capsule)?

Not a good idea: Nyquil has an antihistamine, cough suppressant and acetaminophen. You are already taking Cetirizine (zyrttec), so why mix medications? Why not take a whole Cetirizine to begin with? Do you really need the other ingredients? ...Read more

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My body acts weird. Everytime I use Zyrtec (cetirizine) drops I get very little drowsy only on the first dose. My tolerance goes away if I stop it for long. Why?

My body acts weird. Everytime I use Zyrtec (cetirizine)  drops I get very little drowsy only on the first dose. My tolerance goes away if I stop it for long. Why?

Expected: That's true with most sedating antihistamines. One does get used to the drowsiness after a couple of weeks. Whether this is due to a faster breakdown of the drug by the liver or reconditioning of the brain- no one knows However it is believed that some impairment in performance does happen when measured by performance tools even though you may not be feeling it. ...Read more

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I give my 17mnth old 1/2 teaspoon of children's zyrtec (cetirizine) for allergies but some days it's not enough. Can i increase the dose or try something differ t?

Do not increase : A 17 month old should not have allergies to inhaled items like dust or pollen. Zyrtec (cetirizine) could cause drowsiness and i would avoid long term use of zyrtec (cetirizine) in your child. If your child has a runny or stuffy nose that is unresponsive to zyrtec (cetirizine) then see your doctor to make sure there isn't an infection brewing. ...Read more

Dr. John Chiu
549 doctors shared insights

Zyrtec (Definition)

Zyrtec is a non-sedating antihistamine which is a kind of antihistamine type drug (common ...Read more