Eno is an antacid produced by GlaxoSmithKline. It's globally distributed, mainly across South America, India, and the Middle East, and it's available as sachets and tablets in both Lemon and an ambiguous "Regular" flavor.
Ogilvy & Mather produced a stunning print advertisement for the company, featuring a gun made of food. Quite an improvement over Eno's commercial from the 80s, although if the packets made me seem as effervescent as the actor, perhaps I'd take some on my down days.
via Coloribus