i know how you feel, i feel so much better when i take Claritin D then when i take just the plain Claritin. My doctor suggested that i take the D every other day, maybe you can try that. Also sometimes what i do is buy the Advil Allergy cold & sinus. It has pseudoephedrine in it but only 30 mg compared to 120 which is in the one you probably take. It lasts for 4-6 hours but sometimes i do get by on it, so i guess the lowest dose you take would probably be best if you can on some days. I will usually take that near lunch time which is when my symptoms are bad and i do ok.