San Francisco City Attorney Dennis Herrera is lashing back at Monster Beverage Corp. with his own lawsuit a week after being sued by the Corona energy drink maker.

The root of the legal barbs: Herrera’s attempts to curb caffeine content in Monster products and his efforts to limit the company’s marketing overtures to children.

On Monday, Herrera’s office filed a complaint in San Francisco Superior Court and also accused Monster in a statement of pitching highly caffeinated drinks to minors as young as 6 years old.