Some of the dosage forms listed on this page may not apply to the brand name Claritin-D 12 Hour. Common side effects of Claritin-D 12 Hour include: headache, insomnia, and xerostomia. Claritin-D 12 Hour (loratadine-pseudoephedrine).". "If you don't want to be on medications longterm, allergy shots or oral allergen dangerous side effects of taking allergy medicine long-term, depending on the "Any allergy medication with a '-D' at the end of it (Allegra-D. Side effects of antihistamine nasal sprays might include a bitter taste, and pseudoephedrine (Allegra-D); Loratadine and pseudoephedrine (Claritin-D) Long-term use, especially of stronger prescription corticosteroids, can cause thinning. By Mayo Clinic Staff. Work with your doctor to choose the most effective allergy medications and avoid problems. Examples cparitin. If you are taking it as part of a combination drug, I would this web page at the other drug. The drug is administered with a self-injecting syringe clartiin needle device autoinjector. However, HCTZ often is given along with other medications that can have this effect, especially beta blockers, such as propranolol. Show more related content Show less related content. Side effects might include headache and dry eyes. Available for Android and iOS devices. See below for a comprehensive list of adverse effects. Mast cell stabilizers block the release of immune system chemicals that contribute to allergic reactions. Both my cardiologist and my preferred care provider advised that since the reading of 69 was still in the safe zone, there is no reason to be concerned. Upper respiratory combinations. Oral decongestants relieve nasal and sinus congestion caused by hay fever allergic rhinitis. Epinephrine shots are used to treat anaphylaxis, a sudden, life-threatening reaction.