January 2/Toronto/Health Canada -- Canada's federal health department has issued new regulations that will limit the amount of caffeine allowed in energy drinks.

Caffeine will be capped at 180mg in a single-serving can or bottle, about as much as an 8oz. cup of coffee. Larger, resealable containers will be limited to 400mg of caffeine per liter.

Many leading energy drinks will not be impacted by the new restrictions issued by Health Canada, including Red Bull, which has 80mg of caffeine in an 8.4oz. can, less than a cup of coffee but more than twice the content of most colas.

The regulations also require that energy drinks have labels that clearly list the amounts of caffeine, vitamins and other ingredients. The drinks will also be required to carry a warning that they are not recommended for children or pregnant or breast-feeding women and should not be mixed with alcohol.

Additionally, energy drinks like Red Bull, Monster and Rockstar, which were previously categorized as "natural health products," are now being reclassified as "food," thus coming under the new caffeine cap. And for the next five years, energy drink makers must report annual data on sales, consumption and health incidents.

Energy drink manufactures can only produce drinks that meet the new guidelines from this point forward, but retailers do not have to pull noncompliant drinks already in stock.