Newsday, Oct. 19, 2007 SILVER SPRINGS, Md. - Citing deaths, hallucinations, seizures and heart-rhythm disturbances, doctors called on a joint U.S. Food and Drug Administration panel yesterday to forbid the use of many over-the-counter medications for children up to age 6.   UTMB's Dr. Wayne Snodgrass is one of several American Academy of Pediatrics members who petitioned the FDA this year to reconsider its stance on the drugs' safety. He said: "Overall, if you look at the data that's available, you'll come to the conclusion that these drugs are no more effective than a placebo," said Dr. Wayne Snodgrass of the University of Texas Medical Branch in Galveston. But the potent ingredients can cause unintended consequences, he said.