Last week, Wendy Crossland, the mother of that teenager, filed a lawsuit against Monster Beverages, a publicly traded company in Corona, Calif., that used to be known as Hansen Natural. The lawsuit charges that Monster failed to warn about the risks of its energy drinks; a spokeswoman for the company said last week that its products were safe and not the cause of the teenager's death.
That spokeswoman, Judy Lin Sfetcu, added that Monster was "unaware of any fatality anywhere that has been caused by its drinks."
In an interview, an F.D.A. spokeswoman, Shelly Burgess, said the agency had received reports of five deaths possibly linked to the drink as well as another report of a heart attack. The reports cover a period of 2004 to June of this year.
The reports do not make clear whether the incidents involved other factors, like alcohol or drugs. However, the number of reports that the F.D.A. receives about any product it regulates usually understates by a large degree the actual number of problems.
The release of the filings about Monster Energy may increase Congressional calls for greater regulation of the energy products industry. Monster Energy is among scores of energy drinks like Red Bull and Rock Star, and energy "shots" like 5-hour Energy, that companies are aggressively marketing to teenagers and young people.
In a statement, Ms. Burgess, the F.D. A. spokeswoman, said that it was the responsibility of energy drink manufacturers to investigate accusations of death or injuries associated with them. She said that the agency was still looking into the cases but had yet to establish a causal link between the deaths and the drink.
Monster Beverage makes a variety of energy drinks with names like Monster Rehab, Monster Assault and Monster Heavy Metal. Labels on the containers state that they are "not recommended" for some consumers, including children — a group that beverage producers define as those under 12 years — and people "sensitive" to caffeine.
Monster Energy did not immediately respond Monday to a request for comment on the F.D.A. filings.