Doctor insights on:
Classes Of Antihistamines
In class, at home, 1-2/day, Hives are oftenly occure on my full body, tell me the best way to resolve this problem, even antihistamines doesn't work.
Larger dose: Try a non-sedating antihistamine up to 4 x daily (yes much larger than what is used for hay fever). If this does not help. You may add a H2 antagonist such as Pepcid (famotidine) or ranitidine twice daily. If this happens only at home or at school, then there is something in that environment causing the hives. Consult an allergist if the above measures didn't help. ...Read more
When ever I'm not taken an antihistamine like Clariten or Zyrtec (cetirizine) and I am walking fast like to class I get extremely itchy like in my thigh region?
Itchy: You might have dermatographism which is a physical urticaria from rubbing the skin. Rubbing, pressure or scratching your skin can cause a hive or wheal to develop which can be intensely itchy Your doctor can test you for this if you are not taking antihistamines at the time you are examined. Antihistamines are an effective treatment of this condition ...Read more
I gave expired antihistamine syrup to my 30 months old son incidentally...Is it dangerous? What s the side effect on him?
Expired drugs: There should be no side effects as expiration is usually based on loss of drug effectiveness. Drug companies err on the side of shortening times to expiration. Actually many drugs are effective long after expiration dates. Expired drugs are commonly used effectively by volunteer organizations when no other drugs are available. Relax! ...Read more
Older ones do:
First generation antihistamines (benadryl, clor-pheramine, atarax) cross the blood brain barrier and cause lethargy.
Second generation (allegra, claritin, zyrtec, xyzal, (levocetirizine) clarinex) cause the blood brain barrier at a much lesser amount and more targeted to the h1 receptor. ...Read more
Yes but why: Although antihistamines are a very safe class of medications, the better question is why is there a need to take them daily? If antihistamines are being taken for treatment of nasal symptoms, see an allergist to identify the trigger. ...Read more
Several are good: Loratedine (Alavert, Claritin), Cetirizine (Zyrtec)and Fexofenadine (Allegra)are all effective. Dyphenhydramine (Benadryl) is short acting so if you want the reaction not to come back in the middle of the night then one of the above would be better. Remember that you should not give children under 2 antihistamines without checking with your doctor. Between 2-4 y/o you should also ask. Not for colds ...Read more
There are two important considerations. Efficacy and side effects. Caution must be taken with combination meds (antihistamines along with decongestants). Men with prostate issues and anyone with cardiac/BP issues.
Also glaucoma can be affected especially by first generation antihistamines such as Benadryl (diphenhydramine). Best bet, ask your doctor :-) ...Read more
Antihistamines are traditionally used to treat allergic reactions. I am curious as to what exactly what happens to you in response to specific antihistamines: benadryl, (diphenhydramine) zyrtec, Claritin etc.
Pepcid is a medication that inhibits acid production by the stomach and would be helpful for treatment of heartburn, indigestion (dyspepsia), gastitis (stomach inflammation) or reflux of acid ...Read more
Maybe: Medications that have passed the expiration may still work, but the pharmaceutical manufacturer cannot guarantee their effectiveness. The longer the medication is out of date, the more likely they are less effective. ...Read more
Many: New generation antihistamines (claritin, zyrtec, (cetirizine) allegra) will decrease itching, runny nose and sneezing associated with allergies. They also help with itching and hives. Older antihistamines do the same, but may also cause side effects like dry mouth, dry eyes, GI upset, fatigue, sleepiness, impaired reaction time, and increased appetite. ...Read more
Antihistamines: They are almost all over the counter. The only one that is not yet is one used for deep sedation called hyroxyzine. ...Read more
Not really: Antihistamines are generally safe for long term use. ...Read more
No: Antihistamines bind to histamine receptors without activating the receptor thereby blocking ability of histamine to bind to the receptor and activate it, causing itching and blood vessel dilatation (producing redness and swelling of affected tissue). The ability of the antihistamine to bind to the histamine receptor doesn't decrease over time. Increased symptoms due to increased allergen exposure. ...Read more
Time: Antihistamines such as benadryl, (diphenhydramine) claritin, zyrtec or Allegra will gradually be metabolized naturally by the body by 3 to 5 days. Some of the previous antihistamines (now not currently available could have taken up to 6 weeks). There is no specific "treatment" other than time unless a recent large overdose occurred and this should be evaluated in the er. ...Read more