Washington - Federal health authorities are investigating reports of 13 deaths possibly linked to so-called energy shots and cautioning consumers to talk to their doctors before they take them or other energy drinks.

The Food and Drug Administration has received 92 reports over four years that cite illnesses, hospitalizations and deaths after consumption of a product marketed as 5-Hour Energy. The FDA has also received reports that cited the highly caffeinated Monster Energy Drink in five deaths and one nonfatal heart attack.

Agency officials said the reports to the FDA from consumers, doctors and others don't necessarily prove that the drinks caused the deaths or injuries but said they are investigating each one. In a statement, FDA officials said they will take action if they can link the deaths to consumption of the energy drink. Such action could include forcing the company to take the drinks off the market. They're often found at convenience store checkout counters.

FDA spokeswoman Shelly Burgess said the agency is cautioning consumers that these "energy shots" or "energy drinks" are not alternatives to rest or sleep.

"If someone is thinking about taking one of these products, they should consult with their health care provider to ensure that there are no underlying or undiagnosed medical conditions that could worsen as a result of using them," Burgess said.