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Cetirizine is the main active ingredient in Zyrtec.
It helps relieve runny nose, sneezing, itchy and watery eyes, and nose or throat itching from hay fever and other upper respiratory allergies.
Most fatal overdoses are the result of poly-drug use.
All sedating medications carry overdose risks on their own, however, when drugs are combined, the risk is substantially increased because the drugs typically use different mechanisms in the body to create sedation.
The newer second-generation and third-generation OTC oral antihistamines were developed to target their action on more specific receptors.Other common OTC brands that include the antihistamine diphenhydramine include: Chlorpheniramine is the main active ingredient in Chlor-Trimeton.It helps relieve runny nose, sneezing, itchy or watery eyes, and nose and throat itching from hay fever. It comes in an immediate-release tablet, an extended-release tablet, a chewable tablet, a lozenge, a capsule, and a liquid.Zyrtec can also be used to help relieve redness and itching due to hives.Zyrtec comes in a tablet, a chewable tablet, a tablet that dissolves in your mouth, a liquid-filled capsule, and a syrup.