While it helps a LITTLE BIT with allergies due to pollen, dust, animal dander, etc, it has the most HORRIBLE, LIFE RUINING SIDE EFFECTS you can imagine. The ENT said to take claritin d in the am and xysal at night, but never said to beware of the adverse effects these drugs have (especially together!) You have to really read everything, and know that just because it's OTC, and lots of ppl take it, does NOT MEAN ITS SAFE! I have had nearly all of its bad side effects: terrible insomnia, chills/sweats (often at same time) extreme nausea, vomiting, pounding and racing heart, extreme anxiety, panic attacks, numbness, tingling, urinary issues, diarrhea, constipation, breathing difficulties, extreme fatigue, diff walking or standing long, shaking, tremors, and many more besides this! Yes, was on it way too long (several yrs) because I stupidly took the Drs advice and didn't bother to read the package insert! My bad for not doing that. It has caused me years of pain and $$$$ going from dr to dr to see what is wrong with me, with not ONE DR TELLING ME IT COULD BE THE ALLERGY MEDS!! Not one! Not even the naturopaths I saw or the integrative drs! These drugs cause so many issues and sickness and NOBODY ever says it could be this, go off it and try homeopathic remedies, or allergy drops/shots, or honey/bee pollen. Yes, those things take a little more time and effort, but its a million times worth it to not feel this way and ruin your health. I had to move back in with my parents because i lost my job and was too sick to work! These should NOT BE SOLD OVER THE COUNTER, and pharmacists and drs need to do their job and warn people of the dangers, and not be afraid of retribution by these evil drug companies! Very few people can take this stuff without issues, they will eventually pop up if not right away! And then of course, you'll think its something else or some other disease. STRONGLY RECOMMEND AGAINST EVER TAKING CLARITIN D OR DRUGS LIKE IT!Read More Read Less