At 9:30 a.m. on Thursday, 12 boxes of alli, the first FDA-sanctioned diet drug to be sold without a prescription, were placed on the top shelf of a Santa Monica Walgreens’ diet section. Four hours later, all but one had been sold."I have never in my life experienced anything like this,” store manager Roe Love, a pharmacist for 20 years, said as she eyed the empty space next to the last box of 90 capsules selling for $59.99.