Long Term Effects Of Zyrtec?

[k&ajsmom]

I have been taking zyrtec for close to 10 years now for horrific allergies and asthma. Its always worked great fro me although if Im an hour late taking it I start wheezing or have a allergy attack that resembles the flu. I have always had histimine overproduction since I was very little so I have recently, after some of u pointing out the obvious connections to mcas, that I couldnt seem to see lol have been keeping a log to connect some triggers to my symptoms and worst days, so far the only thing I see clearly is my zytec causing more tachy. I started switching to just claritan to see if this would ease the tachy and ...it did.......? Claritan however is not holding other symptoms at bay... I am gonna get some other meds that have been reccommened through trial and error by others (nasal crom and allegra) but until then I was wondering if anyone else has connected an antihistimine to tachy? I really like my zyrtec, and would hate to give it =(

This confuses me cause if I am having mcas related issues and have taken zyrtec for 10 years, and it helps me so much why is it contributing to cardiac symptoms now?

Sorry about the multiple posts today..I am boycotting my doctor for a few weeks and I am trying to implement some changes, holistically, and just have to get everything fine tuned so I understand what Im doing lol

[flyingsquirrel]

Tachycardia can absolutley be a side effect of zyrtec or any other antihistamine. This can also be an early sign of an antihistamine overdose. Antihistamines block M2 receptors in the heart, preventing the heart from slowing itself down. While zyrtec is a 2nd generation/selective antihistamine (and should therefore only have activity on H1 receptors), at high enough doses any drug 'loses' its selectivity.

Chronic antihistamine use can also cause dehydration, which can lead to tachycardia.

[Katybug]

I can't take Allegra -d because the decongestant makes me tachy but can take plain Allegra. But I had what was normal allergies for years. Now all of a sudden with MCAD I have triggers that never bothered me before...exercise, grapes, avocados, even rubbing avocado oil on my skin causes me MCAD symptoms once it's sunk into my system. I ate those things all my life with no problem. And I was super active with horseback riding and hiking. Now 5 minutes of those activities and I'm a flushing mess of MCAD degranulation! There no telling why these things have changed. None of my docs can give a scientific explanation. They just say they hear it from our crew all the time.

[k&ajsmom]

I know chronic use of antihistimines can cause tachy, however since I have noticed this reaction from zyrtec, I was only on 10 mgs of zyrtec, didnt have problems when I was on 20 mgs years ago. when I was in the hospital they had me strictly on claritan and I seemed fine, then again I had ivs running double time too so ? I wonder if I may be having a some sort of mcas reaction to something in the zyrtec though? some inactive ingredient suddenly triggering something, its just wierd that it helped a few months ago with tachy and now the opposite is occurring.

I have noticed with doing anything physical as soon as I pause for a moment is when I get hot and dizzy but Im not sure it would be considered flushing, I dont get red very often and I never sweat.

I guess I have to just experiment with some new ones and se eif something helps, I cant take anyhing D either, tachy like crazy, and benedryl makes me jittery too. wierd world of pots and triggers. cant wait to get to my specialist and get tested for mcas so I know what Im dealing with here.