Doctor insights on:
What Is The Best Time To Take An Antihistamine
It depends: It depends on the antihistamine and when you are exposed to the cause for your allergies. Antihistamine pills generally take at least 30 minutes to two hours to take effect and peak hours later. Pollen levels are highest in the morning, but if you are exposed to other allergens such as animal dander or dust, those levels would affect you at night. Take it a few hours before your worst time. ...Read more
Depends: Most people respond best to zyrtec or xyzal, (levocetirizine) as long as they don't get drowsy with them. Everybody reacts differently to different antihistamines, though; most people with urticaria will try many of the available antihistamines, alone or in combination, under a physician's supervision, to get the best control of their hives. ...Read moreSee 1 more doctor answer
What is the best antihistamine or best thing to take to reduce the amount and viscosity of mucus? Otc stuff hasn't been working. Thanks!
NONE : Antihistamines will increase mucous viscosity. Increasing fluid intake and use of guafenisen will decrease mucous viscosity. ...Read more
Poorly studied: There are very few unbiased studies looking at herbal therapies for allergies. A review article on this subject felt that the use of butterbur may be equivalent to antihistamines. There are also rare studies using other herbal products, including aller-7, tinospora cordifolia, perilla frutescens, and several chinese herbal medicines that showed some effect. Side effects are not well understood. ...Read moreSee 1 more doctor answer
I have allergic reaction from antibiotic cephalexin. What is the best antihistamine and how long will it take to clear up, also now have swollen face?
Have you been seen?: This is an urgent situation. Hopefully, you have been seen by a physician. If not, proceed to the ER if the swelling involves the mouth (potential for progression to throat and breathing incapacity). If you are improved, then an urgent visit in the morning (or Virtual Consult) is recommended for prednisone (for phenomenon of delayed reaction). Cetirizine 10mg twice a day if no contraindications ...Read more
New generation ones: The new generation antihistamines include Claritin, Zyrtec, Allegra and Xyzal (levocetirizine). These are as effective as older antihistamines (Benadryl, hydroxyzine, chlorpheniramine). Each person may respond differently to the different products and therefore trying them one at a time can be helpful. Since they are over-the-counter and generic (except for Xyzal (levocetirizine)), they are affordable and available. ...Read more
Unclear: Different antihistamines have different potencies. 10 mg of Zyrtec is equivalent to 180mg of Allegra (fexofenadine). Mg doseage as in all medicines are drug specific. In regard to toxic levels, each has it's own known limit. However too much antihistamine can lead to deadly arrythmias/ Please use the recommended dose. ...Read more
Antihistamines: Safety of high dose medications is often unknown. Our experience comes from case reports of persons who intentionally or accidentally consumed unusually excessive quantities. When Claritin (loratadine) was first investigated, safety studies were done at 40 mg (4 times the current recommended dose). We take 10 mg because effectiveness is not significantly different between 10 mg and 40mg. ...Read moreSee 1 more doctor answer
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