Doctor insights on:
Overuse Of Antihistamines
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 The longer the medication is out of date, the more likely they are less effective.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
Yes but why: If you take two antihistamines at once you will bring out the less desirable side effects such as drowsiness and dry mouth. There is really no benefit from this and could lead to an overdose if you did this long term. Its best to take one at a time give it a few days to determine if that antihistamine is working and if not change to another. ...Read more
Depends: The choice of an antihistamine depends on individual responses. Usually we try to avoid the older antihistamines which make a lot of people groggy. I usually recommend Zyrtec or Xyzal (levocetirizine) which has much less drowsiness effect than the older ones. The next choice would be Allegra. Experiment with them and see which works the best for you. ...Read more
Antihistamine & baby: Some babies receive antihistamines in utero. Benadryl (diphenhydramine) was shown to be safe in pregnancy by a class action suit being brought against it failing to show any deformities that were unexpected compared to the rest of the population. But before using any antihistamine in a tiny baby, check with your doctor. Don't use antihistamines for colds. They make secretions thick and increase sinus infection. ...Read more
Antihistamines: You should follow the prescription given to you or the maximum amount on the medication insert, do not self medicate. If higher doses are necessary, they should be guided by an experienced allergist. ...Read more
Antihistamine and BP: Antihistamines are fine, but be cautious with those combinations that contain decongestants. ...Read more
Not related...: Antihistamine can decrease bladder contracting ability so its use in the elderly may make some developing urinary retention. Such situation mislead some people to think antihistamine makes prostate enlarged, that is, not true, but further impairing bladder ability to squeeze urine out of bladder through the already narrowing prostate urethra. ...Read more
Probably not: Antihistamines are one of the safest classes of medications and have been available since the 1940s. At usual doses, there is very few side effects and no harm that will come from taking an antihistamine, especially the newer generation ones such as claritin, clarinex, zyrtec, xyzal (levocetirizine) or allegra. ...Read more