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How much time does it take Claritin to work

A 50-year-old member asked:
Dr. Alex Martinez
Specializes in Allergy
Within 1-2 hrs: Claritin (loratadine) is well-absorbed from the gastrointestinal tract and its effect is often felt within 1-2 hours. Claritin is metabolized in the l ... Read More
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Dr. Jack Mutnick
16 years experience Allergy and Immunology
Who knows: Work for what? Claritin supposedly starts working within 90 minutes. But Claritin is also the weakest binding antihistamine sold over the counter. Per ... Read More
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A 40-year-old member asked:
Dr. Michael Zacharisen
32 years experience Allergy and Immunology
Not necessarily: Many patients will experience relief of symptoms with Claritin (loratadine) d within 1.5 hours even with one dose. However, more continued doses will ... Read More
A 41-year-old male asked:
Dr. Al Hegab
Dr. Al Hegab answered
39 years experience Allergy and Immunology
Don't exceed dosage: Better not to exceed recommended OTC dosage unless seen by an MD, which you might want to do, as you might need another prescription medication to con ... Read More
A 48-year-old female asked:
Dr. Michael Zacharisen
32 years experience Allergy and Immunology
Yes, but: Both Claritin (loratadine) and zyrtec (cetirizine) are new generation antihistamines. While there is no harm to using them together, there is likely ... Read More
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A 42-year-old member asked:
Dr. Michael Zacharisen
32 years experience Allergy and Immunology
About 1.5 hours: The onset of clinical symptom relief is about 1.5 hours for claritin (loratadine). To read the study that compares this to zyrtec and Allegra go to: ... Read More
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A 34-year-old member asked:
Dr. Michael Zacharisen
32 years experience Allergy and Immunology
About 1.5 hours: Onset of clinical relief is about 1 hour for zyrtec and Allegra and about 1.5 hours for claritin (loratadine). To read the study, go to: http://www.N ... Read More
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A 43-year-old member asked:
Dr. Franklyn Gergits
28 years experience ENT and Head and Neck Surgery
Claritin (loratadine) D: Hello, this is a complicated answer in that claritin-d is a combination medication. The onset of Claritin is within 3 hours and the pseudofed will beg ... Read More
A 46-year-old member asked:
Dr. Gary Steven
29 years experience Pediatric Allergy and Asthma
1-2 hours: Most medications take one to two hours to be absorbed into the blood stream. Some, such as steroids, need to be taken for several days to build up to ... Read More
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A 44-year-old member asked:
Dr. Scott Diede
A Verified Doctor answered
A US doctor answered Learn more
1-2 weeks: If there are absolutely no improvements in about a week, i tend to switch people over to zyrtec. It can be a little sedating for some, but I have foun ... Read More
A 42-year-old female asked:
Dr. Kristin Sokol
11 years experience Allergy and Immunology
Yes: Yes, no problem. Loratadine is safe to take before 24 hours is up.

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