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how long does it take for an allergy medicine to work

A 45-year-old member asked:
Dr. Nayla Mumneh
28 years experience Allergy and Immunology
30-60min: Oral antihistamines take anywhere between 30 to 60 minutes to start working. Steroid nasal sprays may take up to 2 weeks, antihistamine nasal sprays t ... Read More

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A 37-year-old member asked:
Dr. Joram Seggev
Specializes in Allergy and Immunology
It depends: You don't tell me what your allergic symptoms are nor what medicine you were prescribed. In principle, antihistamines, oral and topical (nasal and ocu ... Read More
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A 50-year-old member asked:
Dr. Andrew Murphy
28 years experience Allergy and Immunology
Varies: Depending upon the medication used, the time until the onset of effect will vary. Generally antihitamines work relatively quickly and inhaled steroids ... Read More
A 26-year-old female asked:
Dr. John Chiu
Dr. John Chiu answered
56 years experience Allergy and Immunology
Nasal?: For nasal symptoms, a nasal steroid will likely work better but may take a few days.
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A 57-year-old member asked:
Dr. Paul Carter
29 years experience Allergy and Immunology
1/2 to 1 hour: Some antihistamines require metabolism in the liver to be converted into the most effective form to block histamine. These antihistamines take at lea ... Read More
A 26-year-old male asked:
Dr. Michael Zacharisen
32 years experience Allergy and Immunology
1 to 3 hours: Claritin d is a combination antihistamine [claritin= loratadine] and d= decongestant pseudoephedrine. This product is rapidly absorbed then metaboliz ... Read More
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A 39-year-old member asked:
Dr. Michael Sparacino
36 years experience Family Medicine
?: ?
A 38-year-old member asked:
Dr. Robert Marvit
56 years experience Psychiatry
Depends on drug: From immediatly to weeks or months depending on drug the dose and route of administration.
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A 55-year-old member asked:
Dr. Glen Elliott
42 years experience Child Psychiatry
Varies: What is clear is that antidepressants essentially never work instantly. Typically, we talk about 2-4 weeks--but that's once we get to a therapeutic d ... Read More
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A 40-year-old member asked:
Dr. Michael Zacharisen
32 years experience Allergy and Immunology
Variable: The development of environmental allergies usually takes 2-3 pollen seasons. A medication allergy could occur on the first course or after taking the ... Read More
A 55-year-old member asked:
Dr. George Yang
26 years experience Ophthalmology
Another question?: Naphcon a shrinks blood vessels and makes the eye appear less red. However, the more important question is why your eye is red to begin with. Redness ... Read More
A 38-year-old member asked:
Dr. Martin Raff
55 years experience Infectious Disease
UTI: This varies with the type of uti, the antibiotic employed and its efficacy against the causative organism, the immune status and anatomical integrity ... Read More
A 29-year-old female asked:
Dr. John Munshower
29 years experience Family Medicine
Same day: You should be able to hopefully notice some results withing the same day you take it.
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A 48-year-old member asked:
Dr. Clarence Grim
56 years experience Endocrinology
Sulfa meds: They start killing germs within minutes. But this depends on the germs being treated.
A 22-year-old female asked:
Dr. James Lin
Dr. James Lin answered
50 years experience Urology
Here are some ...: Theoretically, it's sound and "yes" to bring a hope, but in reality, it would be more "no' than "yes" for it merely stimulates parasympathetic nerve, ... Read More
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A 38-year-old member asked:
Dr. Fred McCurdy
44 years experience Pediatric Nephrology and Dialysis
2-3 days at least: It takes time for medicines to build up in the body and rid the body of infection. The cdc has a whole lot of information about stds. Check it out a ... Read More
A 48-year-old member asked:
Dr. Al Hegab
Dr. Al Hegab answered
39 years experience Allergy and Immunology
Depends: if taken on empty stomach, 30 minutes should be enough to feel its effect, if on a full stomach takes longer, check that you have taken the right dose ... Read More
A 40-year-old member asked:
Dr. Manav Singla
22 years experience Allergy and Immunology
15 minutes: The typical allergy skin test takes 15 min. To develop once applied to the skin. So you will have meaningful answers in 15 min.! however, plan on you ... Read More
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A 48-year-old member asked:
Dr. Bradley Thomas
18 years experience Vascular Surgery
Varies: Angioplasty's can be performed on any artery in the body. Certain areas are easier to access and treat than others. Certain blockages or problems are ... Read More
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A 27-year-old female asked:
Dr. Theodore Davantzis
39 years experience Dentistry
Infection ?: If you have an infection, then the penicillin will start working within the first 24 hours. If you do not have an infection, the penicillin will do no ... Read More
A 55-year-old member asked:
Dr. Al Hegab
Dr. Al Hegab answered
39 years experience Allergy and Immunology
Depends: in acute upper respiratory tract inflammation, might work right away, but in chronic conditions would take about 2-3 days to work, given that it is ta ... Read More
A 38-year-old member asked:
Dr. Mazen Ghani
23 years experience Radiology
Most radiology : Departments are now digital so images are processed quickly.
A 33-year-old member asked:
Dr. Danny Proffitt
42 years experience Family Medicine
Perhaps?: There are internet reports of this herbal therapy giving relief from hemorrhoids. Herbs and such are not fda regulated and one must use caution and m ... Read More

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