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A 34-year-old member asked:

can i take more than one zyrtec (cetirizine)?

1 doctor answer1 doctor weighed in
Dr. Brian Affleck
ENT and Head and Neck Surgery 30 years experience
Zyrtec (cetirizine): The recommended dosage is 10mg once a day. More than that is considered an overdose and would not be recommended.

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A 46-year-old member asked:

Does chlor-trimeton work just as well as zyrtec (cetirizine)? Whats cheaper?

1 doctor answer3 doctors weighed in
Dr. Stevan Cordas
Internal Medicine 57 years experience
What is cheaper: Yes. Chlortrimeton is cheaper but likely to give you a dry mouth, dry eyes and make you sleepy.
A 44-year-old member asked:

Side-effects of cetirizine?

1 doctor answer5 doctors weighed in
Dr. Thomas Namey
Rheumatology 48 years experience
A few.: Not like benadryl, (diphenhydramine) which has major anticholineric issues, it still can cause drowsiness, dry mouth. It is a very effective and highly specific h1 blocker, which reduces allergic sx.
Dr. Pierrette Mimi Poinsett
Pediatrics 38 years experience
Also antihistamines activate the brain's appetite center, weight gain can result.
May 9, 2012
A 39-year-old member asked:

Does anyone know the long term effects of zyrtec (cetirizine)?

1 doctor answer1 doctor weighed in
Dr. Barbara Stark Baxter
Allergy and Immunology 42 years experience
Zyrtec (cetirizine) effects: Antihistamines in general are some of the safest medications to use long-term.That said, one should never use a medication longer than necessary, and it is wise to switch products periodically no matter what the medication class, in case you are having side effects but don't realize it.I have seen occasional patients develop what seem to be "rebound hives" after long-term use of antihistamines.
A 34-year-old member asked:

What are the side effects of zyrtec, (cetirizine) if any?

2 doctor answers2 doctors weighed in
Dr. Steven Machtinger
Allergy and Immunology 44 years experience
Sleepiness: The major side-effect of zyrtec (cetirizine) is sedation - sleepiness, fatigue, and slowed reaction time. This occurs in 1 out of 10 or 1 out of 12 users. Compare to Benadryl (diphenhydramine) 1 of 3 users or clariting 1 in 50 users. Also occasionally reported are stomachache, headache, diarrhea, constipation & dry mouth & throat. In older men zyrtec can sometimes cause difficulty with urination.
A 42-year-old member asked:

Is it okay to take 2 zyrtecs (cetirizine) if the first one isnt working?

1 doctor answer1 doctor weighed in
Dr. Douglas Johnston
Allergy and Immunology 20 years experience
Nasal congestion?: I would suggest talking to your doctor if otc antihistamines are not helpful. I will mention that antihistamines tend to be more helpful for itching and sneezing and less helpful for nasal congestion. Nasal antihistamines and nasal steroids tend to be more effective for nasal congestion due to allergic rhinitis (allergies).

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Last updated Jul 6, 2019

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