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How long does zyrtec last

A 39-year-old member asked:
Dr. Ryan Phasouk
Family Medicine 18 years experience
Effects: The effects of zyrtec (cetirizine) should last up to 24 hours.
Dr. Diane Minich
Family Medicine 37 years experience
Effects of Zyrtec (cetirizine): Lasts @ 24 hours.

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A 28-year-old female asked:
Dr. Luis Matos
Pediatric Allergy and Asthma 45 years experience
Itch better in 1 hr : Cetirizine ( Zyrtec) is an antihistamine that will help with the itch but not the redness or blisters. You will need to get Hydrocortisone cream to he... Read More
A female asked:
Dr. John Chiu
Allergy and Immunology 57 years experience
Try nasal steroid: Can't be sure whether your problem is from allergy or what's called vasomotor rhinitis (oversensitive nose). Try a nasal steroid regularly for a week ... Read More
Dr. Charles Turck
Pharmacology 17 years experience
Discuss w/ doctor: One thing you might do aside from meds is drink plenty of water to thin out your nasal secretions. While you may use nasal sprays, a saline spray may ... Read More
A 23-year-old female asked:
Dr. John Chiu
Allergy and Immunology 57 years experience
Yes: But do not exceed the maximum dose recommended at any single point in time.
A 37-year-old female asked:
Dr. Jack Mutnick
Allergy and Immunology 17 years experience
Itch: Usually it is not a severe rebound effect but I am sure it can happen. Depends on how much you were taking and what for. Try to decrease by only 1/2 t... Read More
A 20-year-old female asked:
Dr. Paul Grin
Pain Management 36 years experience
No worry: Because it is not extensively metabolized in the liver, topiramate and is prescribed for a variety of pain disorders including the prophylaxis of migr... Read More
A 27-year-old male asked:
Dr. Amrita Dosanjh
Pediatric Pulmonology 36 years experience
Restart: Allergic reactions may be prolonged and chronic. If you are having symptoms, please restart the Zyrtec. Allergy testing is important and a review of y... Read More
A 31-year-old female asked:
Dr. John Chiu
Allergy and Immunology 57 years experience
Yes: 2.5 mg is likely ok for long term use. Most common side effect is drowsiness or fatigue.
A 29-year-old male asked:
Dr. Holly Maes
Pediatrics 36 years experience
Fantastic!: No, there are no long term problems with using both of these on a daily basis. They are doing exactly what we want them to - no ER visits or hospitali... Read More
A member asked:
Dr. Katharine Cox
Pediatric Emergency Medicine 45 years experience
None: It is unlikely he will experience any effect from 1 extra dose. All the best.

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