Have taken DuraVent DA, Omnihist, and now NOhist Plus -- all are off the market and I cannot find any substitute. Help -- other allergy medications have not worked for me. I have taken these drugs for about 20 years and am desperate for a replacement. ## I am in the same situation. I took Duravent and then Omnihist. I just learned that Omnihist is not available now. None of the over the counter drugs seems to keep my ears unclogged as did these drugs. Mucinex gave me a little relief, but it is not nearly as good as the prescription drugs. Any suggestions out there? My doctor could not recommend a good replacement for it. ## I'm sorry, I really wish I had an answer for you, there were some medications on the market that had actually never been proven safe for us and approved by the F...

what is the mechanism action of duavent? ## Unfortunately I was unble to find any drug study on Dura-Vent DA, I did however find the active ingredients which are Chlorpheniramine + Methscopolamine + Phenylephrine. These three drugs combined are used to treat chest congestion, sneezing, runny nose, and itchy, watery eyes due to common colds, or allergies. Do you have any more questions or information to add? Please post back if you do. ## What is the action of duavent?