Doctor insights on:
Long Acting Antihistamines
Can my body start acting diffrent after taking a certain amount of Benadryl (diphenhydramine) for months?
Benadryl (diphenhydramine): It is not clear to me what you mean by "acting different". what are you experiencing? ...Read more
Are there any immediate acting allergy medications I can take other than Benadryl (diphenhydramine)?
Am taking 24hr alegra but my allergies still act up at night, so I take a Benadryl (diphenhydramine) at night too?
I wanted to know I took benadryl (diphenhydramine) because my allergies are acting up and I'm stuffed up, I have a cough, I'm weeding because my asthma as well. Is it o?
Probably not: I presume you are asking whether it is ok to do some weeding when your nose is stuffed up and your asthma is not controlled. In general, the answer would be no since you are likely allergic to weed pollen and molds from the disturbed soil. It is also important for you to call your doctor about your asthma. Benadryl (diphenhydramine) or any other antihistamine has no decongesting action, nasal steroid does. ...Read more
Just took 25 mg of Benadryl (diphenhydramine) will that counter-act/ make my Prozac and klonopin that I took earlier not effective?
My doctor prescribed me trazodone 100 mg for sleep and I am now experiencing pins and needles all over. I took 4 Benadryl (diphenhydramine) to counter act.
Oversedating: It is not a good idea to combine sedating medications. The trazadone was given to help you sleep and taking additional 4 Benadryl (diphenhydramine) which I assume is 100mg will add too much extra sedation on top. If the side effects of trazadone are bothersome I recommend discussing other options with your doctor instead of taking a lot of other medications to mask symptoms. ...Read more
Having eye surgery in two days. I have allergies and take Benadryl (diphenhydramine) or Zyrtec when the act up. Can I still take them 24 - 48 hrs before surgery?
Check with dr: Only your healthcare team can answer this. ...Read more
Is taking antihistamine everyday bad for you in the long term? Will my immune system get impaired?
No and no.: There are no known longterm sequellae from antihistamines. I would stick with the long-acting, non-sedating ones, such as Allegra and Claritin, (loratadine) since the short-acting ones can make you drowsy. Antihistamines do not affect the immune system in any measurable way. ...Read more
What amount of does take to get high off of diphenhydramine hci/antihistamine and how long does it take to kick in?
I have been congested for 10 days -- much longer than a regular cold. Antihistamines help a little. What else can I try?
Still a cold: A viral upper respiratory infection may last up to 2 weeks, although usually it lasts less. Beyond 2 weeks symptoms may suggest allergy or complicating sinus infection. Antihistamines don't work well for colds. You may try nasal irrigation with saline, even a nasal decongestant such as oxymetazoline (afrin) for no more than five days. If no better then, see a physician. ...Read more
How many weeks does it take for claritin (loratadine) 10mg to work? How long should I give it a try before deciding to switch to a different antihistamine?
Try for a few days: Antihistamines begin to work in less than an hour but a person may not feel significant relief for a few days. Claritin tends to be one of the weaker non-drowsy antihistamines. Others available without a prescription are Zyrtec, Allegra and Xyzal. If antihistamines are still not working then an evaluation by an allergist can be helpful to determine the cause of symptoms ...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
Yes: As far as we know, yes, they are safe to take long-term. ...Read more
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
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?
What are long term side effects of diphenhydramine antihistamines and do they lose effectiveness over time? K
Minimal: Diphenhydramine is the active ingredient in Benadryl (diphenhydramine) and has been around for a very long time. Like most antihistamines, there is not believed to be long term side effects. Losing effectiveness is less well studied, but with ongoing use there could be some development of tolerance or it could be that you are still being exposed to an allergen and that is why symptoms are not controlled. ...Read more
How long will it take for prolactin levels (17.5 in male) to drop after discontinuing high doses of antihistamine for three consecutive months that caused elevated numbers? Will hair stop shedding?
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
Painkillers: As a physician one would ask.Get a more detailed answer ›
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
Is qnasl an antihistamine? Is it safe to eat grapefruit and use it? If not how long must one wait after eating it to use it?
Nasal steroid spray: Qnasl is a steroid nasal spray and not an antihistamine. It is safe to eat with grapefruit and any other food. No food interactions. The good effect of nasal steroids may take a couple of days to notice and peak in about a week. Qnasl is one of 2 nasal steroid sprays that is "dry" rather than wet. ...Read more
I've taken melatonin and antihistamines to help me sleep for a long time now, I'm in perfect health so the Dr's say, how do I sleep without the aides?
IF they work. Fast.: Oral and especially topical antihistamines may have a slight- if any- effect on itching and will be noticeable quite soon after use. ...Read more
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