Doctor insights on:
If a red, itchy rash with no contact triggers improves with antihistamines (claritin (loratadine) or low dose doxepin) does that mean it is probably eczema?
Itchy rash: Antihistamines control the itch, whether it is eczema or not, the mechanism of itching is common to a number of rashes and antihistamines only help with the end result but not with the cause. To have a proper diagnosis, you need to have yourself evaluated by a dermatologist or allergist. ...Read more
I'm currently getting patch tested for contact dermatitis. Can i take an antihistamine to relieve itching, or will that interfere with the test?
Yes: You can take antihistamines while getting patch tested as it does not significantly affect the reaction. ...Read more
I started to use Chloropyramine topical cream for releiving the itching from contact dermatitis on chest. is it good antihistamine cream for it?
Oral is better: It is not uncommon for topical application of antihistamines to cause sensitization reactions and to develop allergy to the antihistamine. A batter choice is to use the antihistamine orally and to apply calamine lotion to the area, If it is a true contact dermatitis the only effective way to eliminate the rash is with topical steroids. ...Read moreSee 1 more doctor answer
Is it bad to take an antihistamine during a cold, i.e. does suppressing mucus make the cold last longer?
No value: Antihistamines have no value in the treatment of viral illnesses. ...Read more
Taking lethal over: Dose would do that. Lethal overdoses of antihistamines are rare. Are you considering taking an overdose of antihistamines? If so, please get help right away. You can use national suicide hotlines 24/7 at 1-800-suicide (1-800-784-2433) or 1-800-273 – talk (1-800-273-8255). If you have accidentally taken too many antihistamines please contact 1-800-222-1222 (poison control hotline). Take care. ...Read more
New generation ones: Antihistamines in general are very safe. New generation products (Zyrtec, Claritin, (loratadine) Allegra, Xyzal) are just as effective with less side effects than older antihistamines (Benadryl, chlorpheniramine, hydroxyzine). However, it would be important to address WHY a person needs to take antihistamines long term? Consult with an allergist to assist in identifying the cause of symptoms. ...Read more
Yes: The drug will not affect the success of the vaccination or cause any negative reaction. ...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
Which one: First generation antihistamines are sedating, second generation ones are not, overdosing on the latter hardly kills, but may cause sedation. Overdosing on first generation antihistamines may be more of a problem, but again they are safe in high doses. ...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
45-90 minutes: Antihistamines taken by mouth begin to work in about an hour but may take longer if you've just eaten. Antihistamine nasal sprays (astepro, patanase) begin to work in 30 minutes. An antihistamine injection, usually diphenhydramine, sometimes given for a severe allergic reaction or anaphylaxis begins to work in a few minutes. ...Read moreSee 1 more doctor answer