Doctor insights on:
Types Of Antihistimines
Probably not: It is not a good idea because of the increased risk of side effects from taking multiple similar meds. ...Read more
Yes: But why? Is it because a side effect of the drug, like itching? If so, better stop the Acamprosate and call/see your doctor, wish you well ...Read more
Is it OK to take multiple types of antihistamines within a 24-hour period? Nothing seems to work as long as advertised.
DETAILS?????: What are you treating? Which antihistamines? How many of each? There are easy answers after the details are given. No answer is possible without this information. For chronic urticaria I may manage it with 10 or 20mg cetirizine (Zyrtec) in AM and hydroxyzine at bedtime. I never use Benadryl (diphenhydramine) except as a sleeping pill. ...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
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
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
Depends: It depends on the antihistamine. There are fast acting antihistamines such as Benadryl (diphenhydramine) and Atarax also known as Diphenhydramine and Hydroxyzine that generally last approximately 6 hours. Longer acting antihistamines such as Allegra and zyrtec also known as fexofenadine and Cetirizine generally last approximately 24 hours. ...Read more
Antihistamines: At night should not have any effect on how well they work the next day. People don't get desensitized to antihistamines, though a lot think they do. If you are taking Benadryl (diphenhydramine) at bedtime, don't expect it to take care of you the next day though, as it is a short acting medication. ...Read more
Yes: As far as we know, yes, they are safe to take long-term. ...Read more
Side effects: The second generation antihistamines were developed to try and decrease the side effects of the first generations. Many are "purified" first generation antihistamines so they have the active effects without the side effects of drowsiness, sedation, dry mouth etc. They also tend to have longer half lives, meaning they can be taken once or twice a day not every 4 hours. ...Read more
Antihistamines block: Antihistamines block the receptor sites for histamine released from mast cells or basophils in allergic reactions. As such they suppress symptoms to a variable amount. The only present treatment that can actually alter the allergic condition (diathesis) is immunotherapy (allergy injections). ...Read more
Wanting to die: You will sleep and wake up with a very bad hangover and feel no different than you do right now. Nothing will be solved. Perhaps it is time to get to a drug and alcohol treatment center and just follow their suggestions and get into a fellowship of other hurting humans who will love you till you can love yourself again. ...Read more
Difference between first and second generation antihistamines? Why are 1st generation considered nonsedating?
Sedation: 1st generation are sedating because many people, up to 40%, get sleepy when taking them. 2nd generation antihistamines are chemically modified and are less likely to cause sedation. The generics of the less sedating are cetirizine, fexafenadine, and loratidine. They cause sedation in some people, up to 11%, but much less than the older drugs. ...Read more
Hi. I took three antihistamines by mistake when I was told to take only one at night. Is this dangerous? Each tablet is 120 gms
Likely Ok: Antihistamines have a high safety margin although the older antihistamines may have more side effects. It is unusual to have mistakenly taken 3 pills when most medication is based on 1 pill. You will have to be more careful in the future since other medications may not be as forgiving. ...Read more
How long does it take antihistamines to get out of your system? I was told not to take any for 1 week, but inadvertently did. Is 5 days enough time?
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