Doctor insights on:
Can I Take Expired Allergy Pill It Expired Sept 2011
Allergies occur when your immune system is triggered by envirionmental factors it should ignore--for example, pollen in the air, or dander on a cat or dog--and creates cells to fight against them. An allergic reaction typically causes itching, congestion, or drainage, and ...Read more
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 least 1 hour to become effective. However, some antihistamines like allegra, xyzal (levocetirizine) and Clarinex are already in the active form and begin to work as soon as they are absorbed which take about 30 minutes. ...Read moreSee 2 more doctor answers
Yes w/Allergy shots: The approach to treat allergies is three-fold: avoid the offending allergen if possible (easiest for indoor allergens like pet dander); medications (like antihistamines & nasal sprays); and immunotherapy (shots) that decrease your body's sensitivity to airborne allergy provokers. When the first 2 approaches don't work or medicines cause side effects, shots are the best way to improve allergies. ...Read moreSee 1 more doctor answer
Timing: Antihistamines work by blocking histamine receptors in your body. If the receptors are all full of histamine already (reaction has occurred), then there is nowhere for them to go and it will not make a difference in allergy symptoms. If you take them before exposure to allergens they can block the receptors and you will have less symptoms. ...Read moreSee 1 more doctor answer
Usually nothing: Most allergy pills are antihistamines. Antihistamines are typically a safe class of medications when used in usual doses. The most common side effect could be drowsiness especially if the antihistamine is Benadryl (diphenhydramine) or one of the other older antihistamines. ...Read more
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