Well, the interesting thing about Benadryl is it CAN on occasion cause either diarrhea or constipation! Therefore, my guess is it's giving a little diarrhea type effect. ALSO, Benadryl can make people less anxious, make them drowsy and sleepy. So, there's the second plus for you, it relaxes you, and this will always make the body function more easily.
I do not think of this positive effect on your digestion as allergy-related, altho I can see why you think so. But generally an allergy is something that does not agree with you. Instead, I think of this Benadryl benefit as a side effect, as it is listed in rather long lists but rare lists of fairly minor side effects, which is why you can buy it over the counter. I know people who use it regularly as a sleep aid, so I can see no harm in continuing with taking it, but obviously do not exceed the dose recomended on the box you get it in.
I had a similar thing happen with another drug. I have no idea what it was, but I had a problem with some constipation out of nowhere. But then, since I do take a lot of medicines, I noticed it went away, so I figured it was one of my medicines. Recently I had all my meds changed a little, and I'm back with this stupid constipation, and am working on a daily solution to make it stop. Husband and I have lots of solutions, and I'm working on them!
I do not know why benadryl is helping you, don't know the particular item in with the medicine, nor any other reasons other than I've given, but I think its fantastic to get relief like you have after so many years. Keep us posted on how you're doing maybe one more post in a few weeks, just so we can keep up with the three cheers, or help you if it quits working (heaven forbid). GG
I suffer from reflux and a strange type of digestive illness which makes my entire body fall out of homeostassis, cause respiratory problems, diahhrea, vomiting, dehydrated, pale, and tons of other symptoms. Strangely, benadryl also helps me with these symptoms. It makes them go away within 20 minutes. It's really Nice because I have nearly died twice from this.
Benadryl is an antihistamine. There are 2 types of histamines (that I am aware of) H1 being related to allergies and H2 being related to digestive processes. Therefore my guess is that benadryl is blocking some of the H2 histamines and releiving symptoms.
It depends on the dosage. Benadryl also acts on the digestive tract because it involves seratonin reputake; seratonin is responsible for the contracture of your intestines amongst other things. Excess seratonin will also cause diarrhea. This article explains it well: http://thelastpsychiatrist.com/2009/01/treating_insomnia_with_less.html
My daughter has had abdominal migraines since age 5 a she is now 11. For years, she suffered horrific stomach aches that would strike seemingly at random, about once a week, and she would have severe pain and nausea lasting an hour or two and culminating in vomiting about 80% of the time. During these episodes, she would sit on the toilet with her head in the garbage can screaming inconsolably, not sure which end was about to erupt, and nothing, absolutely NOTHING, I could do would help whatsoever. It is horrible, as a parent, to be absolutely helpless and watch your child in agony like this. We suffered this situation for years - pediatric gastroenterologists, invasive tests, ER visits, many different medications - nothing helped. Finally in desperation on a hunch I tried giving her a benedryl during an attack. Miracle! It worked! And it has worked ever since. Benedryl stops the attack in its tracks after about 15-20 minutes. I told the doctor and he said it had to do with the antiinflammatory effect. He said it was fine to use it this way. It has never once failed to help. Her attacks happen only once every few months now - kids usually grow out of this condition - but it still works. There is definitely something to this, this idea of benedryl and stomach aches. I'm glad it helped you too.