allergic rhinitis
"Have returned repeatedly to Chlortrimeton after taking Zyrtec or Claritin off and on. I get relief for hayfever symptoms without drowsiness and cost is lower. I feel sleepy on the other two meds and the 24 hour dose is not consistent over that period of time. My hayfever is not a severe case with running nose, itchy eyes, and sneezing from Mid-March to May seemingly getting less with age. I'm 69. Have tried the 12 hour dose and find it works consistently for me but prefer the 4 hour tablet."