W.C.
If dry eyes are his biggest complaint, I'd stick with it. Have you considered it's the Flonase? It dries me up more..... I have taken everything under the sun. Claritin and Nasonex are the two I've tolerated the best. While side effects are individual to each person, including in their intensity, Claritin had the least side effects for me. Any allergy med one takes will dry you out, sometimes intensely. Additionally, it takes at least two weeks for full effects of the med to be realized. I would not recommend Zyrtec. I took it for about 7 years and always felt off balance, quickly became lethargic and remained so for 48 hours after one pill, had rapid heart rate, inability to maintain self-control, and was easily and intensely angered. Dr.s always said it couldn't do that and I was imagining things, my parents blamed it on adolescence and generally being a pill of a person. As soon as I went off it I was magically fine (minus the severe allergy issues). Taking it on and off in emergency situations, I was able to determine definitely that the Zyrtec created above side effects. In speaking recently with a new Internist about these things while searching for an allergy med, he said,"Well yeah, of course it did! Mood disorders are the number one side effect with Zyrtec. Definitely don't take it if it effects you thus. I'm surprised they kept you on it for so long." Read everything with allergy/asthma meds if you're thinking about changing and understand that ALOT of them create mood disorders, severe depression, and suicidal thoughts in children.
Whatever you end up with, there's usually a Sam's brand that's WAY cheaper. Claritin is name brand Loratadine. We got two bottles of 500 pills each for $10 at Sam's two years ago - and we're still not through it (and it hasn't yet expired). Just a thought....