I am on a couple of bp lowering drugs...metoprolol...150mg 2x/day and valsartan... Also, crestor 10 mg, nortriptyline..25 mg..once in awhile clonopin .. .5, usually half of .5 when I fly, which is rarely. I used to take Claritin every day, but at the time was only on one bp med and not all this other stuff. I also take food supplements (vitamins) and had a bad interaction with turmeric and clonopin (I found that out after looking online). I am allergic to several antibiotics and pain meds. My husband brought home a nasty virus of some sort last weekend from being in VT on business and in several large airports. He shared it and we have both been rather sick since Sunday...he took a zyrtec tonight and said he thought it helped and wants me to try Claritin to see if our allergies ( trees, grass, etc.) could be part of the problem. I m sorry this is so long...anyway...Claritin with any of my regular meds would be ok or not. (I quit taking it, because we moved to another part of the country where I didn t need it. Now we have heard it is bad for allergies.)