After Eddie (Paul Schulze) overdoses on Xanax he admits to Jackie (Edie Falco) that he wasn't really trying to kill himself. He says "I'm a pharmacist. I know how many not to take." This is true. Even if the tablets were 1 mg, 30 of them are unlikely to be fatal. Xanax overdose alone has a very low death rate. Wikipedia cites a recent study that indicated that in suicides where Xanax was involved that it is usually fatal only when combined with other substances. The death rate when only Xanax was taken is as little as 1%.