SACRAMENTO, Calif. -- Starting Thursday, allergy sufferers can find the most-prescribed allergy medication available for over-the-counter sales. Zyrtec is the brand name for cetirizine and is approved to relieve allergy-related sneezing, runny nose, watery eyes, and also, itching from hives. The U.S. Food and Drug Administration approved it for sale without a prescription in November.Dr. Rajan Merchant from Woodland Healthcare said it is the same formula as a doctor would prescribe."The efficacy is the same; the dosage is the same as the prescription strength. But the reason it is going over the counter is because we have enough safety data...