Hi.
I have two children and myself who used Singular. One has very bad allergies. I started reading up on it and took us all off.
My oldest as GAD (generalized anxiety disorder), which became extremely bad when they put her on it. When she went in for a check up the allergy specialist couldn't believe they put her on it. I have noticed a remarked difference in the two to three weeks she's been off it.
My other daughter is bipolar and has learning challenges. Again, I noticed a bit of difference in her blow-ups and concentration level. For me, not much, but I'm getting more frequent headaches.
I've resorted to going back to using dimetapp (liquid form) or benadryl (liquid form) and trying the smallest dose possible. The adult doses of each in a tablet are fine, but when you can use a 1/4 tsp of dimetapp which is less than the tablet dose, my theory is the less medication the better. The same w/ the benadryl. Both can be sedating, so you may choose to use them in the evening. Especially for a two year old.
I also use liquid sudafed at home as it reacts to all of us with the same effect - jittery, too much caffeine feeling when using the tablets. So again, using a 1/4 tsp when the child gets old enough to use it and see if it takes away the sinus pressure/headache is far better than the tablet dose.
And, all of these are over the counter and cheaper than Claritin or Zyrtec. Both my girls are on Claritin - but again, it was when the got older and allergies were identified. Both notice it seasonally, or around certain animals.
I hate to say, the good old Vics Vapor Rub also helps - even if you rub it on their back a little. Just the menthol helps clear the sinuses.
I hope this helps. Valerie