Okeechobee County School District Perseverance, Respect, Integrity, Dependability, Ethics
A: Zyrtec-D is a combination tablet of an antihistamine (Zyrtec) and a decongestant (pseudoephedrine). Antihistamines help with sneezing, runny noses and drainage. Decongestants help relieve pressure and pain in the sinuses. Zyrtec or the antihistamine portion has a potential to cause some drowsiness and dry mouth. Sudafed (pseudoephedrine) can cause difficulty sleeping, nausea, and loss of appetite.
it takes 30 to 45 minutes to take effect. I take zyrtec at 7 pm. these are both 24 hours tablets. But they don't last 24 hours. My doctor put me on both. I also take alavert 24 hour disolving tab.I take atleast 2 in 24 hours. I have yet to find an over the counter allergy or antihistamine that actually lasts 24 hours.t takes 30 to 45 minutes to take effect. I take zyrtec at 7 pm. these are both 24 hours tablets. But they don't last 24 hours. My doctor put me on both. I also take alavert 24 hour disolving tab.